Answer:
• ecosystem. A community interacting with its physical environment through the transfer of energy and materials
Explanation:
brainliest pls
List the quality control measures taken to ensure contamination does not occur during the Chelex extraction process (DNA extraction) and give reason
Answer and Explanation:
To promote a good DNA extraction through the Chelex extraction protocol, it is important to follow some measures, which are essential for the entire process to take place efficiently.
The most important measure is to avoid contamination. In this case, all surfaces, container and substances used must be properly sterilized, preventing unnecessary elements from coming into contact with the DNA sample or the protocol reagents.
It is important that the researcher is wearing clean, appropriate clothing and gloves when using this protocol. This avoids impurities and contamination with the researcher's DNA.
Another precaution must be taken with the DNA sample and the reagents that will be used during the extraction. All must be stored correctly, preventing their degradation, especially the DNA, which is a very unstable molecule.
Finally, the researcher must strictly follow all the steps of the protocol as indicated.
Match the muscle with its type.
1 deltoid:
2 triceps:
.
3 heart:
.
4 sartorius:
.
5 intestine:
.
6 veins:
.
7 biceps:
.
8 trapezius:
.
9 stomach:
.
10 gastrocnemius:
.
a cardiac
b smooth
c striated
Answer:
1 deltoid: striated
2 triceps: striated
3 heart: cardiac
4 sartorius: striated
5 intestine: smooth
6 veins: smooth
7 biceps: striated
8 trapezius: striated
9 stomach: smooth
10 gastrocnemius: striated
Explanation:
Striated muscle is a type of tissue composed of repeated functional units called sarcomeres, which are the basic contractile unit of the muscle fiber. The striated appearance is caused by repeating bands of actin and myosin proteins. Striated muscle tissue is subdivided into two major parts: 1-cardiac muscle and 2-skeletal muscle. Skeletal muscle is a highly dynamic tissue that is mostly attached by tendons to the bones in the skeleton. This voluntary tissue (skeletal muscle tissue) is composed of multiple fascicles or bundles of muscle fibers. Moreover, cardiac muscle tissue, also known as myocardium, is a type of striated muscle that contracts and releases involuntarily, composed of cells called myocytes present in the heart. Finally, smooth muscle is a type of involuntary and non-striated muscle tissue localized within the walls of organs/structures (i.e., intestine, esophagus, stomach, uterus, urethra, bladder, blood vessels, etc.).
Which major body system is responsible for transporting nutrients,carbon dioxide, oxygen and blood cells throughout the body?
1.Circulatory system
2.Digestive system
3.Respiratory system
Answer:
1.Circulatory system
Explanation:
three constitutional limitations to the right to freedom of expression?
Answer:
(1)limitation must be within the constitutional power of government; (2) the limitation must further an important or substantial governmental interest; (3) the governmental interest must be unrelated to the suppression of the freedom of expression; and
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The following picture suggests what
A. location A is more survivable by all species of rock pocket mice.
B. location B is more survivable for all species of rock pocket mice.
C. with time survivability of both species changes dramatically in location A due to natural selection.
D. with time survivability of both species changes dramatically in location B due to natural selection.
Answer:
B
Explanation:
location B is more suitable for rock pocket mice
The branch shown below has FOUR individual leaves. Use the dichotomous key to identify the tree’s genus and species.
A.Albizia julibrissin
B.Cornus florida
C.Juglans nigra
D.Pinus taeda
Im giving brainlist
Dichotomous key (PLZ HELPLPP)
Answer:
The answers are the following.
Explanation:
The candy no. 3 and 4 is hard whereas the candy no. 5 and 7 is not hard. The candy no. 3 is on the stick whereas the candy no. 1, 2, 4, 5, and 7 is not on the stick. The snicker and candy no. 7 are long and thin whereas the candy no. 1, 3, 4, 5 are not long and thin. The Snickers candy is made of chocolate whereas the candy no. 1, 3, 4, 5 and 7 are not made of chocolate, they are made of other substances. The candy no. 1 is triangle shaped whereas all the candies except candy no. 1 is not present in triangle shaped.
which of the following is not possible consequence of surface meaning?
what can a wave be decribed as
Answer:
what wave hehe
Explanation:
sorry I don't know
Question 5 of 30 Which statement provides the best description of the relationship between primary consumers and producers? O A. Producers and primary consumers compete with each other for food sources. B. Primary consumers eat secondary consumers, which rely on producers for food. C. Producers provide primary consumers with the chemical energy they need. D. Primary consumers provide producers with the chemical energy they need.
10% of the energy stored in the producer's tissues is used by herbivores. Option C. Producers provide primary consumers with the chemical energy they need.
What is a trophic web?
The trophic web is the interaction between different organisms involving the transference of energy when some of them feed on the other ones.
The ones placed at lower levels pass energy to the ones at the higher levels. Only 10% of the energy stored in each individual's tissues is transmitted to its predator. The remaining 90% of energy is released into the environment.
Organisms at each level feed on the preceding one and become food for the next one.
• The first link corresponds to a producer organism -autotroph-.
• The following links are the consumers -heterotrophs-: herbivores and carnivores.
• The last links are the decomposers that degrade organic matter from dead organisms.
Because it is a web, all organisms are in equilibrium until a change occurs. When a sudden change affects any of the involved links, there can be a cascade effect on the web.
Any change in a link population size (increasing or decreasing) will affect the superior links and the immediately anterior link.
Options:
A. Producers and primary consumers compete with each other for food sources ⇒ False. they do not compete. Producers take energy from the sun, while primary consumers take energy from producers.
B. Primary consumers eat secondary consumers, which rely on producers for food. ⇒ False. Secondary consumers feed on primary consumers.
C. Producers provide primary consumers with the chemical energy they need. ⇒ False. True. 10% of the energy stored in the producer's tissues is provided to primary consumers -herbivores-.
D. Primary consumers provide producers with the chemical energy they need.⇒ False. Primary consumers use the energy from the producers.
The correct option is C. Producers provide primary consumers with the chemical energy they need.
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A group of students prepared a table listing the types of reproduction that occur in
several organisms.
Organism
Type of Reproduction
Amoebas
Yeasts
Cats
Asexual reproduction
Both sexual and asexual reproduction
Sexual reproduction
Both sexual and asexual reproduction
Sexual reproduction
Both sexual and asexual reproduction
Hydras
Frogs
Ferns
Based on this information, which of the organisms can produce offspring that are
genetically identical to the parent organism?
A Ferns only
B Amoebas and yeasts only
C Cats, hydras, frogs, and ferns only
D Amoebas, yeasts, hydras, and ferns only
Based on this information, the organisms that can produce offspring that are genetically identical to the parent organism are ferns only. The correct option is A.
What is reproduction?The generation of descendants is reproduction. Asexual reproduction and sexual reproduction are the two main types. An organism that reproduces sexually incorporates the genetic material from both of its parents and is genetically distinct.
Asexual reproduction creates genetically identical kids by having one parent replicate itself. The generation of plants that we recognize as ferns or horsetails are sporophytes.
Typically, the summer is when the sporophyte releases its spores. For spores to germinate and develop into gametophytes, they need to land on a suitable surface, like a damp, protected place.
Therefore, the correct option is A. Ferns only.
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Suppose that you are able to sequence a portion of Dr. Ogden's genome. The DNA sequence below is a stretch of one of the genes.
TAC CGT ATA AAA AAT TAA CTT AGA CGT GCT CTT TCT CTT CGA GAA GAC ATA TTA CTT CGT TGA ATC
Given the DNA sequence above type the mRNA processed transcript (assume that TCT CTT CGA GAA GAC ATA is an intron).
Answer:
huh
Explanation:
fam what is that
The mRNA processed transcript will be: AUG GCA UAU UUU UUA AUU GAA UCU GCA CGA GAA AAU GAA GCA ACU UAG.
What is transcription?In genomics, transcription is the method of generating an RNA copy of a gene's DNA sequence. This copy, known as messenger RNA (mRNA), transports the protein information encoded in the gene's DNA.
This RNA copy, known as messenger RNA (mRNA), contains the genetic information required for a cell to produce proteins.
It transports information from the cell's nucleus to the cytoplasm, where proteins are produced.
The entire gene is copied into a pre-mRNA, which includes exons and introns, during transcription. Introns are removed and exons are joined to form a contiguous coding sequence during the RNA splicing process.
Thus, as the introns are getting removed completely, the mRNA sequence for the given DNA sequence will be: AUG GCA UAU UUU UUA AUU GAA UCU GCA CGA GAA AAU GAA GCA ACU UAG.
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define cell and atom
Answer:
cell is made of molecules whereas atoms make up molecules. Cells are the smallest functioning unit in a living organism
How to avoid wastage of food?
Answer:
we can avoid wastage of food by throwing it to dustbin
Explanation:
"Done"
Succulents and cacti often have short, thick leaves with a waxy coat. What function does this structure serve?
A) retains water
B) the plant uses less energy to grow these short leaves and conserves energy
C) prevents water from evaporating off leaves
D)all of the above
Answer:
C) prevents water from evaporating off leaves
Explanation:
Succulents and cacti are a group of plants known as XEROPHYTES. These are plants that grow and survive in areas or conditions where there is lack of water e.g deserts.
However, these plants need to adapt to the low or no water condition and one of the ways they do this is by possessing short, thick leaves with a waxy coat. This enables them to preserve water that would have been lost via transpiration from the leaves.
Answer:
(c) prevent water from evaporating off leaves
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What can scientists learn from index fossils?
A. The events that caused a layer of rock to form
B. The type of atoms in a sample
C. The exact date a plant or animal lived
D. The age of an unfamiliar layer of rock
Answer: C
Explanation:I have an aunt that is a scientist and she told me that they can find out the exact age dating based off of the fossil.
Pseudomonas putida is used for fermentation of the lactose present in cheese whey. The bacteria are cultivated in a steady-state chemostat with sterile feed and at a dilution rate of D = 0.28 h-1. The lactose concentration in the feed and the effluent are S0 = 2.0 g/L and S = 0.10 g/L, respectively. The following information is available: YX/S = 0.45 g X/g S, YX/O2 = 0.25 g X/g O2, and C* = 8 mg/l (saturation DO). a. Determine the steady-state biomass concentration (X) and the specific rate of oxygen consumption (go2) b. What should be the oxygen transfer coefficient (Kia) to overcome oxygen transfer limitations if the desired DO concentration in the fermentation medium is 2 mg/l?
Answer:
Explanation:
Given that:
The dilution rate D = 0.28 h⁻¹
The concentration of lactose in the feed [tex]S_o = 2.0 \ g/L[/tex]
The effluent S = 0.10 g/L
Also;
[tex]Y_{X/S} = 0.45 g\ X/g \ S , \\ \\ Y_{X/O2 }= 0.25 g \ X/g \ O2, \\ \\[/tex]
Saturation C* = 8 mg/l
To calculate the steady-state biomass, we use the formula:
[tex]X = Y_{X/S}(S_o-S_e) \\ \\ X = 0.45(2.0 -0.10) \ g/L \\ \\ X= 0.45 (1.9) \ g/L \\ \\ X = 0.855\ g/L \\ \\ X = 855 \ mg/L[/tex]
The biomass is 0.855 g/L
For a steady-state condition, the oxygen uptake rate can be illustrated by using the formula:
[tex]q_{o_2}X =\dfrac{\mu_X}{Y_{X/O_2}}[/tex]
where;
[tex]\mu =[/tex] dilution rate (D)
Thus, the steady-state can be expressed as:
[tex]q_{o_2}X =\dfrac{D}{Y_{X/O_2}}[/tex]
[tex]q_{o_2}X =\dfrac{0.28}{0.25}[/tex]
[tex]q_{o_2}X =1.12 \ h^{-1}[/tex]
The specific rate of oxygen consumption [tex]q_{o_2}X =1.12 \ h^{-1}[/tex]
b)
In the fermentation medium, if the desired DO concentration [tex]C_L[/tex] = 2 mg/L
Here, the oxygen transfer is regarded as the rate-limiting step.
As such, the oxygen transfer rate(OTR) is equivalent to the oxygen uptake rate.
In this scenario, let's determine the oxygen transfer coefficient [tex](K_{La})[/tex] by using the formula:
[tex]OTR = K_{La}(C^* - C_L)[/tex]
where;
[tex]K_{La}[/tex]= coefficient of oxygen transfer
C* = saturation
Since [tex]OTR = q_{O_2}X[/tex]
[tex]q_{o2}X = K_{La}(C^*-C_L) \\\\ (1.12 )(855) = K_{La}(8-2) \\ \\ 957.6 = K_La (6) \\ \\ K_{La}= \dfrac{957.6}{6} \\ \\ K_{La} = 159.6 \ h^{-1}[/tex]
Thus, the oxygen transfer coefficient [tex]K_{La}[/tex] = 159.6 h⁻¹
how do you justify the statement"biologists have wide choice of career"?
Answer: Due to the fact that biologists have a wide range of topics to research
Explanation:
Which sequence of events would make a sedimentary rock?
1) uplift, weathering, and erosion
2) melting, solidification, and uplift
3) deposition, burial, and cementation
4) crystal growth, compaction, and melting
Answer:
3) deposition, burial and cementation
Deposition, burial and cementation
What is sedimentary rock?
Sedimentary rocks are formed from pre-existing rocks or pieces of once-living organisms. They form from deposits that accumulate on the Earth's surface.
How are sedimentary rock formed ?
Sedimentary rocks are formed from deposits of pre-existing rocks or pieces of once-living organism that accumulate on the Earth's surface. If sediment is buried deeply, it becomes compacted and cemented, forming sedimentary rock.
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using appropriate example,discuss two advantages of motility in bacteria
Answer:
- avoidance of toxic substances.
- increased efficiency of nutrient acquisition.
Consider the following scenario: In a muddy lake environment, some fish have brown scales. Most fish, however, have silver scales. Predators have a harder time seeing the fish with brown scales. Which term best describes the brown scales?
Answer:
Camouflauge
Explanation:
The given condition in which predators have a more challenging time seeing the fish with brown scales is known as camouflage.
What is camouflage?Plants and animals use camouflage to blend into their surroundings.Both predators and prey use camouflage to avoid detection.Prey may change their skin color or disguise themselves to avoid detection by other predators during this phenomenon. Predators like the Stone Flounder, a flatfish, lay motionless on the ocean floor, buried beneath the sand, waiting for prey.Why do animals use camouflage?hide from their pursuers.They are making it difficult for their prey to flee and sneak upon them.Coloration and markings are used to blend into their surroundings.Thus, we can conclude that the brown scale fish use camouflage, resulting in a more challenging time for predators to see the brown scale fish.
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match each symbol with its description.
From what you know of tonicity, what can you say about the plant cells and the solutions in the test tubes
Answer:
Tonicity is the relative amount of solutes that is dissolved in solution which determine the direction and level of diffusion.
Explanation:
Tonicity is the relative amount of solutes that is dissolved in solution which determine the direction and level of diffusion. There are three types of tonicity i.e. hypertonic, hypotonic and isotonic solution. If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink due to more solute in the external environment. In an isotonic environment, there is no water movement occurs, so there is no change in the size of the cell. When a cell is placed in a hypotonic environment, water will enter the cell, and the cell will swell. due to lower amount of water present inside the cell.
Blood type is determined by proteins. Blood type A has a different protein than blood type B. Blood type AB has both types of
proteins and type o does not have either type of protein. When blood is transfused, the recipient's immune system will detect any
new or foreign proteins. The blood type proteins must be located:
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in the red blood cell nucleus.
Inside the red blood cell cytoplasm.
on the outer surface of the red blood cell membrane
in the nuclear membrane.
On the outer surface of the red blood cell membrane.
These proteins are called antigens.The antigens expressed on the red blood cell determine an individual's blood group.What proteins determine blood type?The sugar (glycan or carbohydrate) antigens.
The red blood cell membrane contains three types of protein that carry blood group antigens:
Single-pass proteins.Multi-pass proteins. Glycosyl phosphatidylinositol (GPI)-linked proteins.To know more about antigen here
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Some experts attribute the increase in ADHD diagnoses to an increased awareness of the disorder, while others attribute the increase to ______ diagnoses.
Answer:
incorrect
Explanation:
Attention-deficit/hyperactivity disorder (ADHD) is one of the most common neurodevelopmental disorders affecting children. ADHD is characterized by different behaviors that include one or more of the following symptoms: inattention (poor concentration), impulsivity (interrupting behavior) and hyperactivity (state abnormally active). It has been reported that DHD diagnoses in children between 4 and 17 years of age dramatically increased from 6 percent (6%) during the period 1997-1998 to 10 percent (10%) during the period 2015-2016. Although the causes of this increase have not been established, the American Psychiatric Association (APA) indicates that the increase might be due to the increased access of communities historically relegated to receive care and decreased stigma to be diagnosed with ADHD. Other possible causes range from chemical factors to unhealthy habits during pregnancy (e.g., smoking, substance abuse, poor nutrition). On the other hand, it has also been proposed that this increase may be as a result that ADHD is often misdiagnosed and confused with other conditions (e.g., bipolar disorder, autism, kids being kids, etc).
If a human has an X and a Y chromosome pair, they are
The history of science is full of great works that have marked a turning point in the development of a branch of knowledge, and in which the proposals for a new theoretical frame of reference or a new systematization of the known facts. Explain this argument thoroughly with example
Answer:
The cell theory
Explanation:
The modern cell theory states that 1-all living things are composed of cells, 2-all cells derive from pre-existing cells by cellular division, and 3-the cell is the structural and functional unit of all life forms. Many researchers contributed to the development and formulation of the modern cell theory. First, the invention of the optical microscope, followed by the improvement with lighting by Robert Hooke (1660) and observation of microscopic organisms by Antonie van Leeuwenhoek (1675) contributed to the observation of cellular structures that previously were unknown. Subsequently, the cell theory was proposed by Schleiden and Schwann (1839) who suggested that all life forms are composed of cells (the fundamental unit of life). Subsequently, the theory was expanded by Virchow (1855) who proposed that all cells arise from pre-existing cells. Thus, the modern cell theory is the result of the scientific work of many researchers that have contributed across centuries in order to collect a body of knowledge (both experimental and observational) that supports the statements resumed in this theory. Nowadays, it is impossible to conceive biology as a scientific discipline without making reference to the modern cell theory.
Science brings knowledge and explanation to everything that surrounds us, one of the most impactful theories is the evolution of species by Charles Darwin.
What does science bring to the world?Science allows humanity to understand a little more about nature, science is important in our life because it helps us to have a better quality of life, because through science many diseases have been eliminated. Science enables advances in health, food, energy and others.
Whit this information , we can conclude that Science brings knowledge and explanation to everything that surrounds us, one of the most impactful theories is the evolution of species by Charles Darwin.
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RE
Which level of organization includes all the other levels of organization?
O organ system
O organism
O tissue
O cell
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Submit
Mark this and return
Answer:
organism
Explanation:
the reason is that all the levels organisation make up an ORGANISM
you discover a certain species of weed growing in soil contaminated with toxic pcbs, and later determine that the pcb resistance is due to a single dominant allele (r) and only the seeds with genotype r_ will germinate and survive. if 19% of the seeds from a randomly mating population of resistant weeds will germinate in contaminated soil, what is the frequency of the R allele
Answer:
f(R) = p = 0.1
Explanation:
Due to technical problems, you will find the complete explanation in the attached files.
Which of the following is NOT a type of map?
O A. An ordnance survey.
OB. A compass.
OC. A globe.
OD. A sketch of the street you live on.
Reset Selmotion
Answer:
A compass
Explanation:
A compass tells you which direction you are going whether that be North, East, South, or West. A map I'd a picture or drawing of a certain area.