Answer:
Explanation:
A
Question 3
What is the source of the carbon atoms in a plant's cell ?
Multiple choice question.
cross out
A)
They were created as the plant grew
cross out
B)
The sun
cross out
C)
Water molecules
cross out
D) the environment
Answer: The environment
Explanation:
Plants get the majority of the carbon atoms in the form of carbon dioxide during the process of Photosynthesis.
Photosynthesis is the process of making food using sunlight, water, and carbon dioxide in the presence of chlorophyll. These react to form glucose which further converts into cellulose.
Glucose contains carbon atoms in it.
The carbon dioxide is obtained from the environment. Hence, we can say that source of carbon atoms is the environment.
The sun does not contain any carbon atoms.
Water also does not contain any carbon atoms.
a drug which has high affinity for nicotinic receptors on neurons but not on skeletal muscle fibers and is a pharmacological antagonist not an agonist. phm 350 quizlet
Curare (tubocurarine, TUBARINE) is a drug that has a high affinity for nicotinic receptors on skeletal muscle fibers but not neurons is an agonist and causes muscle relaxation.
Cholinergic receptors called nicotinic acetylcholine receptors (nAChRs) are found in the plasma membranes of certain neurons and on the postsynaptic side of the neuromuscular junction. Because they are ionotropic receptors, nAChRs do not depend on second messengers and are connected directly to ion channels.
One non-depolarizing muscle relaxant is Curare, which inhibits the neuromuscular junction's nicotinic acetylcholine receptor (nAChR), one of the two types of acetylcholine (ACh) receptors. By attaching to the acetylcholine receptor (AChR) at the neuromuscular junction, the drug curare blocks the activation of skeletal muscles by nerve impulses (Bowman, 2006).
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I will give brainliest to whoever answers
Answer: A, D, D
Explanation:
Answer:ok
Explanation:ok
the common stimulatory drug caffeine increases the likelihood that this neuron will generate an action potential. propose mechanisms by which caffeine may act at these synapses to encourage this action; think molecu
Explanation:After ingestion, caffeine is quickly absorbed from the gastrointestinal tract into the circulatory system [17, 18]. The maximum plasma concentration is reached after 30-60 minutes from consumption. However, maximum plasma concentrations reached between 15 and 120 min have been reported, due to inter-individual differences and delayed gastric emptying. Caffeine is widely distributed through the body. The pre-systemic (i.e., first-pass) metabolism takes place in the liver, since orally ingested substances are absorbed through the small intestine into the portal circulation, before entering the systemic one. Caffeine’s pre-systemic metabolism is negligible [17] and, once caffeine is absorbed, it promptly gets into all the body tissues and crosses the blood-brain, blood-placenta, and blood-testis barriers [17, 19]. The hepatic microsomal enzyme system is in charge of caffeine metabolism in the liver.
Charles Darwin observed a unique beak size and shape in the finch population of each of the Galapagos Islands that he visited.
Charles Darwin postulated ancestral species over time adapted beak size changes in finch species to acquire different food sources. Hence option b is correct.
What is darwins theory for natural selection?During his voyage, Charles darwin observed unique beak sizes among the finches species on the Galapagos islands.
Due to competition for available food sources island finches change their beak size and shape to acquire food sources, these changes are selected by natural selection.
Natural selection theory depends on how the species changes in their body over evolution.
Therefore, the finch population has a unique beak shape and size on Galapagos island, so option b is correct.
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Your question is incomplete, but most probably your full question was,
Charles Darwin observed a unique beak size and shape in the finch population of each of the Galapagos Islands that he visited. Which is the most likely cause of the observed variation?
differences in the climate among the islands.competition among individuals for available food sources.competition among individuals for desirable mates.differences in egg size among the populations.describe the five conditions required for hardy-weinberg equilibrium and recognize that all these conditions are not met in real populations, hence allele and genotype frequencies change over time
The conditions to maintain the Hardy-Weinberg equilibrium are: no mutation, no gene flow, large population size, random mating, and no natural selection In a population with random mating.
the Hardy-Weinberg principle connects genotype frequencies to allele frequencies. Consider a population where there is segregation between two alleles (A and B) at a single locus. The letters p and q stand for the frequency of alleles A and B, respectively.
According to the Hardy-Weinberg principle, genotype frequencies will be p2, 2pq, and q2 after one generation of random mating. Genotype frequencies are anticipated to remain constant in the absence of additional evolutionary processes (such as natural selection), and the population is considered to be at Hardy-Weinberg equilibrium. There are several presumptions that the Hardy-Weinberg principle is based on.
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How could one visually distinguish a
monocot root from a dicot root? How could one
visually distinguish between the cross-section of
a monocot root and dicot root?
Answer:
Monocots have flower parts in threes or multiples of threes as shown in the flowers to the left. Dicots have flower parts in multiples of fours or fives like the five-petaled dicot flower
Explanation:
Answer:
by the arrangement of the xylem and phloem.
Explanation:
In a dicot, the xylem and phloem form an X or Y shape compared to the monocot are arranged in a ring formation.
Gives rise to cork cambium, parts of the vascular cambium, and lateral roots Gives rise to lateral roots only
Vascular Tissues
Has a limited number of Xylem and Phloem Has a higher number of Xylem and Phloem
Shape of Xylem
Why oestrogen can be used as a contraceptive drug
The reason why estrogen can be used as a contraceptive drug is that it is one that act to prevent ovulation.
Which hormone can be used as a contraceptive?For the majority of people, there are hormonal contraception that is a safe as well as effective technique to prevent pregnancy since they either made up of progestin solely or estrogen as well as progestin.
There is the use of an implant, an intrauterine device (IUD), etc are examples of hormonal approaches.
Therefore, In order to prevent ovulation, estrogen as well as progestin combinations are said to be effective.
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What is a normal force?
It acts parallel to an object.
It acts perpendicular to an object.
It acts against an object slowing it down.
It acts with an object adding to its speed.
if bananas are fruit than bananas are plants if bananas are plants then bananas use photosynthesis so if bananas are fruit then bananas use photosynthesis
Wrong.
Bananas are a fruit. Fruits are not plants, fruits are a product of plants. A banana tree uses photosynthesis but not the fruit.
most enzymes in the human body work best at neutral ph. select the reasons why changing the ph of the fluid in which a human enzyme is dissolved (for example to a ph of 3) will affect the enzyme's ability to function.
Most enzymes in the human body work better at physiological pH, because too low or too high pH concentration may alter the tridimensional conformation of these proteins.
Why do enzymes best work in physiological conditions?Enzymes generally best work in physiological conditions (except hydrolytic lysosomal enzymes) because they establish chemical bonds to normal pH conditions (pH: 7), thereby modifications in pH may alter enzyme domains required to bind their corresponding substrates.
Therefore, we can conclude that most of the human enzymes when dissolved to a pH of 3 cannot work because it is a very acidic medium where the chemical bonds of the enzyme are altered, thereby modifying this 3D macromolecular structure.
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“Why is there so much peat in the peat/perfrost system? (Minimum of 5 sentences)
Answer:
no
Explanation:
Why do plant cells need a high osmotic pressure?
Answer: Osmotic pressure is the main cause of support in many plants. When a plant cell is in a hypotonic environment, the osmotic entry of water raises the turgor pressure exerted against the cell wall until the pressure prevents more water from coming into the cell.
Explanation:
8. Slow twitch fibres (Type1) are efficient at using oxygen to release
energy. They are good at using oxygen because:
Answer:
wut
Explanation:
is the promoter sequence part of the dna that is transcribed? multiple choice yes, both the -35 and -10 sequences are present on the new transcript. only the -10 sequence is present on the new transcript. neither the -35 nor the -10 sequences are present on the new transcript.
In the promoter sequence part of the DNA that is transcribed, Neither the -35 nor the -10 sequences are present on the new transcript.
Promoters are an important class of regulatory elements that mark the beginning of every transcript. All active promoters contain a large, intricate protein structure known as the pre-initiation complex (PIC), which differentiates promoters from other genome sequences.
The sense strand of DNA, which will be transcribed, and the transcription direction are both outlined by promoter sequences. The TATA box is a conserved promoter sequence that can be found 25 to 35 base pairs upstream of the transcription start site in many eukaryotic genes.
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What might you conclude about the membrane structure of the final vesicle formed during
exocytosis and the cell membrane?
A student wants to measure the volume of a liquid. Which of the following tools would be best to use?
For measuring the volume of a liquid then a student should use a measuring cylinder, pipette, and measuring flask.
What type of tools are used for the volume?If a student wants to measure the volume of a liquid then he should use the following things.
1. Measuring cylinder.
2. Pipette.
3. Measuring flask.
Above are the things used for measuring a liquid's volume. A measuring cylinder is an apparatus used in the laboratory for measuring the volume of liquid, chemicals, and other things. The pipette will be more correct with all the samples, accounting for every drop of the substance being held within the device. A measuring flask is used for measuring very precisely one specific volume of liquid.
So we can conclude that cylinder, pipette, and measuring flask are the tools that are used for measuring the volume of a liquid.
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in the pulse-chase experiment that demonstrates protein transportation post er, cells were incubated with radiolabeled leucine for a period time and subsequently cells were 'chased' by incubating them with non-radioactive amino acids. why is the 'chasing' step necessary?
In the pulse-chase experiment to track the fate of proteins that are labeled during the pulse, the cells are washed and re-cultured (“chased”) by incubating them in radioactive amino acids. This is why the chasing step is necessary.
Pulse-chase experiments are used in labeled compounds to follow the regular dynamics of cellular pathways and processes. In a cell, molecules are continuously synthesized and degraded at different rates. Changes in these molecule localizations and their expression levels over time can be observed by first “pulsing” or simply say exposing cells to a labeled compound, then successively exposing the cells to the same compound, unlabeled, which is called “chasing”.
Compounds being studied are commonly labeled or tagged with fluorescent dyes or radioisotopes. Microscopic techniques are used to detect the turnover visually. There are several protein labeling techniques for pulse-chase which have certain application potentials. Reporter fluorescence fusion proteins are frequently used, but they are expected to disrupt or harm the complexing behavior of the native target protein, be toxic to the cells themselves
It may also affect target stability for pulse-chasee experiments. Fluorescence reporter fusion proteins also cannot be satisfied. For the multicolor pulse-chase experiments, SNAP-tag® and CLIP-tag™ are considered very useful. It is possible to do sequential labeling with two or more fluorophores.
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7.State the functions of each of these polysaccharides.
Celluse-
Startch-
Glycogen-
The functions of each of the below polysaccharides are: -
Cellulose- Cellulose, a hard, fibrous, & water-insoluble polysaccharide, is crucial in maintaining the structure and stability of plant cell walls. The plant cell walls are made up of microfibrils, which are collections of cellulose chains, or fibrils, which are collections of microfibrils and polysaccharides.
Starch- Starch is a kind of carbohydrate that is present in all plants, including grains, fruits, and vegetables. A healthy diet must include starchy foods since they provide you energy, fiber, as well as a feeling of fullness. Starch molecules are broken down by the body into glucose, which serves as the body's main fuel source.
Glycogen- When it comes to maintaining our muscles well-fueled for exercise, glycogen is crucial. Our muscles will use their glycogen reserves while we workout. Our blood glucose and liver-stored glycogen can both be used to power our muscles.
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in a herd of dairy cows the narrow-sense heritability for milk protein content in 0.76 and for milk butterfat is 0.82. the correlation coefficient between milk protein content and butterfat in 0.91. if the farmer selets for cows producing more butterfat in their milk, what will be the most likelyeffect on milk protein content in the next generation?
Protein content will increase most likely effect on milk protein content in the next generation.
The correct option is A.
How does protein benefit you?Protein is present in every human cell. An amino acid chain makes up the basic basic foundation of proteins. In order for your body to repair damaged cells and create new ones, you require protein in your diet. Children, adolescents, and expectant women all need protein for healthy growth and development.
What type of cell makes proteins?Cells use a complicated collection of molecules known as a ribosome to construct proteins. The ribosome assembles amino acids into the proper order and connects them together via peptide bonds. The result of this process, known as translation, is a polypeptide, which is a long chain of amino acids.
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The complete question is-
In a herd of dairy cows the narrow-sense heritability for milk protein content is 0.76, & for milk butterfat it is 0.82. The correlation coefficient between milk protein content & butterfat is 0.91.
If the farmer selects for cows producing more butterfat in their milk, what will be the most likely effect on milk protein content in the next generation?
a) protein content will increase
b) protein content will not change
c) protein content will decrease
d) it is impossible to predict protein content change from the data given
3. What process do spores undergo to become haploid cells?
Answer:
Diploid sporophyte cells undergo meiosis to produce haploid spores. Each spore goes through mitotic divisions to yield a multicellular, haploid gametophyte. Mitotic divisions within the gametophyte are required to produce the gametes. The diploid sporophyte results from the fusion of two gametes.
growth in plant is restricted to certain region explain
A farmer grows potatoes by separating out the "eyes" and planting the pieces containing the "eyes". The means by which the farmer grows potatoes is known as
Group of answer choices
sexual reproduction
asexual reproduction
binary fission
cross-pollination
Answer:
my guess would be binary fission, in not 100% sure
Explanation:
Answer: asexual reproduction.
Explanation: the process id called budding
What was the rationale behind introducing wolves to the Greater Yellowstone Ecosystem (GYE)?
The rationale behind introducing wolves to the Greater Yellowstone Ecosystem (GYE) was to increase the population of wolves to balance the ecosystem.
The Greater Yellowstone Ecosystem was intended to receive these gray wolves (Canis Lupus) in order to boost the wolf population there after it had previously been dispersed due to people killing them off under the presumption that they were predators and were considered dangerous animals.
What is an ecosystem?
All the organisms and the physical setting they interact with make up an ecosystem. The nutrition cycles and energy flows connect these biotic and abiotic elements. Photosynthesis is how energy enters the system and is absorbed by plant tissue.
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Juan has collected a cricket. Which question can a dichotomous key help him answer.
Answer: Does it have 6 legs?
Explanation:
although a number of muscles may be involved in an action, the principal muscle involved is called the prime mover, or . a muscle with the opposite action of the prime mover is called an .
A muscle with the opposite action of the prime mover is called an Antagonist.
An antagonist is a muscle that acts in opposition to the primary mover or agonist. Maintaining body or limb position, such as holding the arm out or standing tall, and controlling rapid movement, such as in shadow boxing without landing a punch or the capacity to halt the motion of a limb, are two crucial functions antagonists play in muscular function.
These muscles are in charge of putting bones back in their proper alignment, antagonist muscles control and slow down movement opposite to their agonist partner, while in other situations a muscle can be an antagonist throughout a particular movement.
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In 4 sentences describe a couple of areas in the brain that are responsible for creativity.
As it appears to be in charge of many of the processes that support creative thinking, the frontal cortex has been referred to as the hub or center of creativity.
How do brains function?Millions of nerve cells in your brain are arranged in patterns that help you think, feel, behave, move, and sense things. Your brain and the rest of your body are linked by a vast system interconnected nerves that allow for rapid communication.
What is the term for the brains?The cerebrum, cerebellum, and brainstem are the three primary parts of the brain. The brain's largest structure, the cerebellum, is composed of the right and left hemispheres. Higher cognitive tasks include understanding touch, vision, listening, speech, logic, emotion, learning, and fine motor control, among others.
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Explain the process of filtration and evaporation with the help of labelled diagram?
Answer:Evaporation happens when a liquid substance becomes a gas
Explanation:
What happens after the prohase
Answer:
After prophase is complete, the cell enters prometaphase.
During prometaphase, the nuclear membrane disintegrates and the mitotic spindle gains access to the chromosomes. During this phase, a protein structure called the kinetochore is associated with the centromere on each sister chromatid.
Answer: well after the prophase is complete the cell will enter the prometaphase where the nuclear membrane disintegrates and the mitotic spindle gains access to the chromosomes.
Explanation:
How does the use of a scanning electron microscope differ from that of a transmission electron microscope?
A scanning electron microscope can produce only a two-dimensional black and white image, while a transmission electron microscope can produce a three-dimensional color image.
A scanning electron microscope can be used to study live specimens, while a transmission electron microscope would harm the specimens that are being viewed.
A scanning electron microscope can be used to study the details of a specimen's surface, while a transmission electron microscope can be used to study the internal structures of a cell.
A scanning electron microscope can produce images of specimens prepared in liquid, while a transmission electron microscope requires all water to be removed from specimens first.
what is the answer ?? need asap
A scanning electron microscope can be used to study the details of a specimen's surface, while a transmission electron microscope can be used to study the internal structures of a cell.
The main difference between SEM and TEM is that SEM uses transmitted electrons that pass through the sample to create an image, whereas SEM detects backscattered or knock-off electrons to create an image. SEM is ideal when you need to observe a relatively large area and only surface detail is desired.
If you want the interior details of small samples at the near-atomic resolution you need a TEM. The optical microscope has a high resolution. Electron microscopy helps to show the surface details of a sample. Disadvantages Light microscopes can only be used when there is light and are expensive. Electron microscopy uses short-wave electrons resulting in low magnification.
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