Heart rate and stroke volume decrease under decreased parasympathetic stimulation is True.
When the parasympathetic nervous system is stimulated, the heart rate decreases and the stroke volume increases. This is because the parasympathetic nervous system stimulates the release of the neurotransmitter acetylcholine, which binds to muscarinic receptors on the sinoatrial node of the heart, causing a decrease in the heart rate and an increase in the stroke volume. The decrease in heart rate is due to a decrease in the release of excitatory neurotransmitters, such as epinephrine and norepinephrine, which stimulate the heart rate. The increase in stroke volume is due to the increased relaxation of the atrioventricular valves, which allow more blood to be pumped out of the heart with each beat.
Parasympathetic stimulation is responsible for slowing the heart rate and increasing the stroke volume of the heart. When parasympathetic stimulation is decreased, both the heart rate and the stroke volume decrease. This can be seen in cases of increased sympathetic stimulation, such as during exercise or periods of stress. During these times, the heart rate increases and the stroke volume decreases as the parasympathetic system is inhibited.
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High pitched sounds produce a peak displacement of the basilar membrane near the apex of the cochlea. True or False.
False
Because low frequencies generate maximum displacement towards the apical end of the cochlea, while high frequencies cause maximal displacement close to the base of the cochlea (near the stapes).
How does the basilar membrane's mobility depend on the frequency of sound waves?The distance that sound waves travel decreases with increasing frequency. As a result, a tone at a certain frequency causes stimulation to peak at a particular location on the basilar membrane.
Where in the cochlear duct do frequencies ranging from high to low pitches activate the hair cells?With respect to the cochlea's base and apex, high frequencies and low frequencies respectively activate hair cells.
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Koala are a specialist species because they _______.
a. only eat eucalyptus leaves
b. are marsupials
c. live in trees
d. eat leaves
a. only eat eucalyptus leaves.
Koala are a specialist species because they a. only eat eucalyptus leaves.
What is a specialist species?A species that fills highly specific niches in its environment can survive and procreate.
The conditions in which specialists live allow them to adapt quite well, but they are unable to do so in other environments.
Animals that need particularly specific resources are known as specialist species. These animals frequently have a relatively restricted diet or require a certain habitat condition to exist. The tiger salamander is an example of a specialist.
They need to reside in wetland habitats that don't dry out in the spring and summer in order to be able to breed. They also need a lot of worms and insects for their food.
Koalas are a specialised species since they only consume eucalyptus leaves.
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Answer:
A. only eat eucalyptus leaves
4. Dragons can be Yellow, Red, or Orange.
Show the letters that match the phenotype. USE R and Y
5. Show the cross between a Red dragon and an Orange Dragon.
What percentage of the offspring are red?
Answer:
Red RR
Orange RY
Yellow YY
percentage of Red := 50%
Explanation:
note that this is related with Codominance.
therefore RY gives out an Orange dragon.
to find the cross between a Red and an orange we can use punnet square:
it will give RR, RR, RY, RY
so, 2/4 are Red. that means it is 50%
what are usually the primary producers in an ocean grazing food web? what are usually the primary producers in an ocean grazing food web? fungi plants phytoplankton animals
Primary producers are photosynthetic organisms (plants and/or phytoplankton) that make up the base of the food chain in many ecosystems. Herbivores are the principal consumers—the critters that eat the primary producers.
The base of the aquatic food web is composed of primary producers, which include bacteria, phytoplankton, and algae. Primary producers don't require food because they can create their own energy. Microorganisms called phytoplankton, which includes protists like algae & diatoms, are the ocean's main producers. Planktonic organisms, such as protists and tiny animals, make up the bulk of marine consumers. Bacterial species do the majority of the decomposition, allowing nutrients to return to producers.Primary producers are photosynthetic organisms (plants and/or phytoplankton) that make up the base of the food chain in many ecosystems. Herbivores are the principal consumers—the critters that eat the primary producers. In a terrestrial environment, organic matter is home to primary producers. They exist and develop where there are resources to support them since they are immobile. Green plants, fungi, moss, bacteria, & algae are the main producers.
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what substances do you use to blank a fire
Answer:
Three types of extinguishing agents are typically used—carbon dioxide, dry chemicals, and foam water for fires involving flammable liquids, greases, and oils. Carbon dioxide is a compressed gas agent that prevents combustion by displacing the oxygen in the air surrounding the fire.
in a protein region that forms an alpha helix, what does the main chain carbonyl oxyggen hydrogern bond with
In alpha helix structure of protein, carbonyl group oxygen bonded with amine hydrogen as a hydrogen bond. The alpha helix (-helix) is a right-hand helix shape wherein every backbone NH group hydrogen bonds to the backbone C=O. group of the amino acid four positions ahead in the protein.
Alpha () amino acids are a protein's main building block. As their name suggests, they have both an amine functional group and a carboxylic acid functional group. These two functional groups are separated from one another by one carbon group, as indicated by the alpha designation. The alpha carbon is also joined to a hydrogen and a third group, which can be any size or length, in addition to the amine and carboxylic acid. This group is shown as an R-group in the diagram below. Twenty amino acids are employed as the building blocks for proteins in living things. Only at the R-group position do they diverge from one another.The fundamental structure of a protein is only the arrangement of the amino acids in a polypeptide chain. For instance, the polypeptide chains A and B of the hormone insulin.
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in gene expression in eukaryotes, the primary transcript is transported unchanged directly to the cytoplasm and is ready for translation. State True or False your answer:
a. True
b. False
Mike thinks that the seasons are caused by Earth moving around the Sun.
What is Mike doing?
O A. Drawing a conclusion
OB. Forming a hypothesis
OC. Proving a trend
OD. Making an inference
SUBM
B. Forming a hypothesis
Mike is forming a hypothesis that the seasons are caused by Earth moving around the Sun. A hypothesis is an educated guess or prediction about something, based on available evidence. In this case, Mike is making a prediction about the cause of the seasons, but he has not yet tested or confirmed his hypothesis.
FILL IN THE BLANK. a cell with one set of chromosomes would be termed a ________________ cell.
Answer:
haploid
Explanation: a haploid cell only contains one set of chromosomes
Which of the following statements about fossils is NOT true?
A. Fossils are clues to how Earth has been changing over millions of years.
B. Fossil records indicate the existence of transitional species.
C. The fossil record is now complete.
D. Fossils could be bones or imprints of ancient organisms preserved in rock.
Answer:
C. The fossil record is now complete
72. what are the two groups that leukocytes are divided into? how do we distinguish between these two groups
The term leukemia means white blood. White blood cells (leukocytes) are used by the body to fight infections and other foreign substances. Leukocytes are made in the bone marrow. Leukemia leads to an uncontrolled increase in the number of white blood cells.
Common causes of leukocytosis include having an infection, but it also can occur if a person has had bone tumors or leukemia.
Septic shock may cause either leukocytosis or leukopenia. Many septic patients exist between these two extremes, with a normal WBC (such patients often develop leukocytosis in a delayed fashion). For example, half of the patients presenting to the hospital with bacteremia may have a normal WBC.
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FILL IN THE BLANK. _________, account for ________ of all known animal species.A. Vertebrates, animals without a backbone; 95%B. Invertebrates, animals with a backbone; 95%C. Invertebrates, animals without a backbone; 95%D. Invertebrates, animals without a backbone; 99%E. Vertebrates, animals with a backbone; 95%
Answer:
C. Invertebrates, animals without a backbone, 95%
Explanation:
Invertebrates, which are animals without backbones, account for around 95 to 97% of all animals. Vertebrates, animals with a backbone, only account for around 3 to 5%.
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you are a researcher studying nutria in the wild. for best success, when should you look for them?
Nutria is known to live in warmer, often wetter environments, including such coastal marshes or wetlands inside the lower latitudes.
Nutria were first introduced to the United States for the fur trade in 1899, but they did not reproduce. Subsequent introductions have been successful, as records show nutria were present in California's Central Valley but also South Coast in the 1940s and 1950s, but had been eradicated by the 1970s.
The nutria is indeed a large, furry, aquatic rodent with a light to dark brown coat. Nutria are closely related to beavers, but have arched backs but also long, round, sparsely haired tails, instead of wide as well as flattened beavers. Adults have a body size of two feet, a weight of 15-20 pounds, and a tail length of 1-1.5 feet. Nutria tracks can grow up to 6 inches long, due to having 5 toes per foot, and also have visible webbing on the hindfeet.
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what is the correct sequence of events in viral reproduction? a.penetration, attachment, integration, biosynthesis, maturation, release b.endocytosis, uncoating, maturation, and release c.attachment, fusion, biosynthesis, maturation, and release d.attachment, penetration, biosynthesis, maturation and release
Answer:
d. attachment,penetration, biosynthesis, maturation and release
which of these mutations will have an effect on the protein produced by the gene in which the mutation occurs? select all that apply.
a. Point Mutation
b. Missense—A change in a single nucleotide that results in a changed codon that codes for a different amino acid.
c. Insertion—Anywhere from one to several nucleotides are inserted into the sequence of a gene
d. Deletion—Anywhere from one to several nucleotides are removed from the sequence of a gene.e. none abovef. all correct
Missense—A change in a single nucleotide that results in a changed codon that codes for a different amino acid, will have an effect on the protein produced by the gene in which the mutation occurs.
A genetic change in which the genetic code is changed by a single base pair substitution, resulting in the production of an amino acid that differs from the typical amino acid at that site. Some missense variants (or mutations) change how a protein functions. referred to as a missense variant.
A missense mutation happens when a mistake in the DNA coding causes a change in one of the DNA base pairs, such as when A is substituted for C.
This one modification, known as a substitution, causes the DNA to now encode for a new amino acid. Sometimes, altering an amino acid has no impact whatsoever on how the resulting protein functions. A change in amino acid can sometimes improve a protein's ability to perform its function, but it can also make the protein appear to be "faulty" in other situations.
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What receives stimuli from receptor sites in the sensory organs and transmits them to the brain and spinal cord?
Option c is Correct. The afferent neuron sends stimuli to the brain and spinal cord from receptor sites on the sensory organs.
What functions do afferent neurons perform?
The nerve fibers that carry sensory data from the outside environment into the brain are known as afferent neurons, also referred to as sensory neurons. Special senses like vision, hearing, smell, or taste, as well as the senses of touch, pain, and temperature, can all play a role in sensory information. Afferent neurons are frequently connected to specialized sensory receptors that are divided into groups based on the stimuli to which they respond.
The sensory afferent neurons transmit information about an external stimulus that is detected by the sensory receptors (such as touching a hot pan) up the spinal cord to the brain, where association neurons will determine how to respond. The motor efferent neurons will then interact with those association neurons to deliver information down the spinal cord and out to the muscles, instructing them on what action to make (e.g., pulling away from the hot pan).
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Correct Question:
What receives stimuli from receptor sites in the sensory organs and transmits them to the brain and spinal cord?
a. Efferent neuron
b. Associative neuron
c. Afferent neuron
d. Glial cell
When a population colonizes a new area, growth is initially slow. This phenomenon is called?
Carrying capacity
Lag Phase
exponential growth
stationary phase
When a population colonizes a new area, growth is initially slow, and this phenomenon is called the "lag phase," which is present in the second option.
What is the growth curve and its importance?The growth curve indicates the growth of the individual in the ecosystem, and generally there are four phases, such as the lag phase, which is a slow growth phase, and it shows the slow growth as an organism newly starts to grow, and then the exponential growth is seen as there is enough food and space available, and then after reaching the carrying capacity, the growth slows down.
Hence, when a population colonizes a new area, growth is initially slow, and this phenomenon is called the "lag phase," which is present in the second option..
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which type of proteins move needed substances or waste materials through the plasma membrane?
Transport proteins help the plasma membrane transfer both necessary and unwanted molecules.
Proteins called "transport proteins" are responsible for moving materials across cellular membranes. In the membrane itself, transport proteins create a channel or a carrying mechanism that enables their substrate to move from one side to the other. Three different classes of transport proteins are involved in assisted diffusion: channel proteins, gated channel proteins and carrier proteins. A channel protein, a subclass of transport protein, functions as a pore in the membrane by rapidly allowing water molecules or tiny ions to pass. In order to move the specific solute being transported across the membrane, carrier proteins—also known as carriers, permeases, or transporters—bind the target solute and go through a sequence of conformational changes.
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To examine meiosis in ferns, you would study __________.
A
the antheridia
B
the archegonia
C
both the antheridia and the archegonia
D
both the archegonia and the sporangia
E
the sporangia
Option -E: To examine meiosis in ferns, you would study the sporangia. A sporangium is a structure in certain plants and other organisms that is charged with making and storing spores.
Spore mother cells divide within the sporangia to produce spores. The spores are produced by a type of cell division known as meiosis. A single diploid parent cell divides to produce four haploid daughter cells during meiosis. Meiosis is a type of cell division that occurs in sexually reproducing organisms and results in a reduction in the number of chromosomes in gametes.
Meiosis, also known as "reduction division," reduces the number of chromosomes to half the normal number so that when sperm and egg fuse, the baby has the correct number.
Meiosis occurs in primordial germ cells, which are distinct from the body's normal somatic cells and are designed for sexual reproduction. A germ cell goes through interphase, which is when the entire cell replicates in preparation for meiosis.
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Incomplete dominance is a____inheritance pattern. it states that neither trait is____. the traits appear to blend together.
Non-Mendelian, dominant/recessive.
Incomplete dominance is a Non-Mendelian inheritance pattern. it states that neither trait is dominant/recessive. the traits appear to blend together.
Incomplete Dominance:
When both alleles of a gene are only partially expressed at a locus, it is known as incomplete dominance. This sort of gene interaction frequently produces an intermediate or distinct phenotype. Additionally called partial dominance.
For instance, the gene for the colour red predominates over the allele for the colour white in roses. However, the heterozygous blooms that carry both alleles are pink.
Because neither of the two alleles is totally dominant over the other, incomplete dominance results. This leads to a phenotype that combines both of them.
In the case of incomplete dominance, the ratio of red, white, and spotted flowers in the F2 generation from heterozygous plants will be 1:2:1.
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Answer:
Incomplete dominance is a
✔ non-Mendelian
inheritance pattern. It states that neither trait is
✔ dominant
. The traits appear to blend together.
Explanation:
edge
During a class practical form four students came across a plant whose flower floral parts were in multiples of four and fives.To which sub-division and class dass the plant belong?
Organs in eudicots are typically grouped in multiples of four or five.
What are eudicots?Eudicots, also known as dicots, are named after their two cotyledons. Cotyledons are the first fleshy leaves that grew around the embryo.
The eudicots, Eudicotidae, or eudicotyledons are a clade of flowering plants distinguished by the presence of two seed leaves upon germination. Dicotyledons is the source of the term.
Eudicot organs are typically organized in groups of four or five.
Thus, as the given plant have flower floral parts in multiples of four and fives, it can be considered in dicot category.
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what occurs when a species enters a new environment and different traits affect its survival and evolution?
When a species enters a new environment, a variety of different traits can affect its survival and evolution. If the species is foreign to the environment, the species must adapt to the new climate, terrain, food sources, and predators in order to survive.
The introduction of a species into a new environment is known as ‘range expansion’ and can have both positive and negative impacts on the species’ survival and evolution.The most important factor in a species’ survival and evolution in a new environment is its ability to adapt. A species must be able to quickly adjust its behavior, physiology, and genetics to the new environment in order to survive.
The species may need to develop new behaviors, such as mating strategies, or physiological changes, such as the ability to tolerate a wider range of temperatures. The species must also evolve genetically in order to survive, developing new traits that are better suited for the environment.
Different traits can have a large influence on a species’ survival and evolution in a new environment. A species’ body size, for example, can have a big impact on its ability to survive. In a new environment, a species with a larger body size may be more successful, as it can outcompete smaller species for resources.
A species’ reproductive strategy can also have an effect on its survival and evolution. Species that reproduce quickly and produce large numbers of offspring are more likely to survive in a new environment, as they can quickly adapt to new conditions.
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which of the following statements is true of essential trace minerals in general? a. they can be found in a wide variety of foods. b. they function independently in the body. c. they are
It is True that essential trace minerals a. they can be found in a wide variety of foods. For some essential trace elements, the gap between toxic intakes and optimal intakes to meet physiological needs is significant, but for others, it is much smaller.
Minerals known as trace elements or trace metals are found in trace amounts in living tissues. Although the evidence is only suggestive or incomplete, some of them are known to be nutritionally essential, others may be essential, and the remaining are regarded as non-essential. If consumed in sufficient quantities over an extended period of time, all trace elements are toxic. Iodine and fluorine are two examples. A wide variety of foods, including meat, fish, cereals, milk and dairy products, vegetables, and nuts, contain trace elements in trace amounts.
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what are the structural similarities of the organ system for these two species of digestive system between perca flavescens and homosapiens
Like a human and an earthworm, the fish's digestive tract begins at the mouth. Similar to humans, fish ingest their food and then when it passes through their throat.
As food travels down the esophagus, it enters the gizzard, where it is further digested.
The human body's digestive system consists of a collection of organs that operate in concert to transform food into energy. The gastrointestinal tract, along with auxiliary organs including the liver, pancreas, and gallbladder, make up the digestive system anatomically.
The mouth, stomach, esophagus, small intestine, and large intestine, which houses the rectum and anus, are among the hollow organs that make up the gastrointestinal tract (GI tract).
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The phenotype of offspring would most likely be influenced by mutations during which biological process within the parent?
Answer:
Mitosis
Explanation:
Since all the cells in the offspring begin with the two parental gametes, every cell in the body of the offspring will contain the mutation. When a mutation occurs during mitosis, the organism in which the mutation occurs is affected.
why are single-nucleotide polymorphisms (snps), which have been associated with schizophrenia and bipolar disorder, currently not used to diagnose either of these disorders?
Genetics. Schizophrenia runs in families, although no single gene is known to be to blame. It's more likely that distinct gene combinations render people more susceptible to the illness.
Only a few genes have been proven to be associated to schizophrenia. A mutation in the SETD1A gene clearly increases the risk of the disease. Other genetic variants linked to schizophrenia have minor impacts, whereas a single mutant copy of SETD1A is linked to a significant increase in disease risk.
Deletions or duplications of genetic material in any of several chromosomes, which might influence several genes, are also likely to raise schizophrenia risk. A minor loss (microdeletion) in a region of chromosome 22 known as 22q11 may be involved in a small percentage of cases.
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what is the purpose of protonephridia in flatworms? to serve as a structure for sexual reproduction to regulate fluid balance
the purpose of protonephridia in flatworms is To regulate fluid balance
Protonephridia are groups of flame cells. A flame cell is a type of excretory cell observed in relatively simple freshwater invertebrates, such as flatworms, rotifers, and nemerteans; these are the only animals with a dedicated excretory system. Flame cells operate like a kidney, expelling waste materials.
Flatworm, also known as platyhelminth, any member of the phylum Platyhelminthes are a bunch of soft-bodied, flattened invertebrates.
The role of the protonephridia is the same as that of most excretory organs: after ultra filtration, substances from the lumen are reabsorbed in a more or less selective manner. The large surface area of the channel cell aids in reabsorption.
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Complete question :
What is the purpose of protonephridia in flatworms?
To exchange gas
To serve as a structure for sexual reproduction
To sense prey
To respond to stimuli
To regulate fluid balance
Which of the the following energyie ource produce the leat harmful envirmental effect
Geothermal energy is one of the least harmful to the environment
What is geothermal energy?
The thermal energy produced and kept in the Earth's crust is known as geothermal energy. The ongoing nuclear fusion process keeps the Earth's core at a temperature that is roughly consistent with that of the Sun. Some rocks melt under the intense heat and pressure, which causes the mantle to rise (as they become lighter with the heat). These molten rocks that were created in the crust of the Earth are propelled upward where they become trapped in certain areas known as "hot spots." Steam is produced when the hot point makes contact with subterranean water. This hot water-formed area occasionally has surface outlets. Hot springs are where this hot water bursts from these sources.
According to the question:
Geothermal energy is a clean form of energy, making it one of the least damaging to the environment. It can be utilized in an emergency and won't run out of water because it consumes water continuously.
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why do you think it is important for a reaer to seperate the facts from the opinions when reading an autobiogrphy
It is important to distinguish between fact and opinion because a fact is a truth based on evidence, while an opinion is a view that is not based on checkable evidence.
A fact is a reality supported by evidence, whereas an opinion is a belief that is not supported by verifiable data, hence it is crucial to distinguish between the two. People form their own opinions about a subject using facts. Opinions may be biased and evaluated according to who is expressing them. When reporting a story, journalists frequently employ a combination of facts and people's opinions. The facts can be used by readers to learn more about the story, and the opinions can help them establish their own conclusions. When making purchases, customers also combine facts and opinions. For instance, if a person is looking for a vegetarian restaurant, they will need to know if the establishment is vegetarian. However, they may also utilize user evaluations to choose whether to make a reservation.
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what kind of activity uses cas9 to cleave target dna? a. hydrolase b. nuclease c. ligase d. transferase
The kind of activity that uses cas9 to cleave target dna is (b) nuclease.
With the use of the straightforward-yet-effective CRISPR/Cas9 genome editing technique, researchers may precisely delete, reorder, add, or modify nucleotides, among other genomic or epigenomic alterations in cells. With the help of these technologies, it is now possible to create animal models for lung disorders and study the consequences of mutations in lung cells made from human iPSCs. Teams are experimenting with the technique to modify disease mutations in iPSCs obtained from patients, differentiate them into different lung cell types, then engraft these cells into the original patient. In a related work, lung cells in animal models were successfully edited using CRISPR technology in utero, paving the way for in vivo editing of disease mutations.
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