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natali 33 [55]
2 years ago
14

Why can food chains

Biology
1 answer:
lana66690 [7]2 years ago
3 0

Answer:

A. Because energy is lost at every level.

Explanation:

energy decreases as it travels from lower levels to upper levels--which is a logical observation you could make.

Think of it like this--if a fish eats a small organism, it will then spend some of the energy obtained from the organism swimming around--so when a larger fish eats our fish, the energy from the original organism will already be partially lost (from our fish swimming around).

This means that when this pattern continues over multiple levels, we keep losing energy--which limits the environment's capacity for organisms to survive.

Hope this helps, have a lovely day :)

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Two limits to cell growth is by rates of protein synthesis and by the folding rates of its slowest protein
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The partial displacement of a bone from its joint is known as
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Answer:

subluxation.

Explanation:

Subluxation is the partial displacement of a bone from its joint.

Dislocation is complete displacement of a bone from its joint.

Luxation is complete separation of joints.

Sublocation generally return to its normal position without the help from orthopedic doctor.

Example; Nursemaid's elbow caused by subluxation of head of radius from annular ligament.

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Why are fossils not found in igneous rocks?
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Answer:Igneous rocks are made from cooling of lava or magma.

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3 years ago
In colorectal cancer, some tumor suppressor genes are inactive. This is an important factor resulting in uncontrolled cell divis
tresset_1 [31]

Answer/Explanation:

(1) a mutation in the coding region, resulting in an inactive protein

To check to see if there is a mutation, you could extract the DNA from the cancer cells and then perform PCR to amplify the gene of interest. You could then perform sanger sequencing and compare the sequence to the normal gene to see if a mutation is present. To test the effect of the mutation, you would want to see if an active protein has been formed.

To see if a normal sized protein has been formed, you could perform a western blot, comparing the protein band to the WT protein band. If the protein is absent or much smaller, it is likely not a functional protein.

(2) epigenetic silencing at the promoter of the gene, resulting in reduced transcription.

To check for changes in the epigenetic landscape of the promoter, you could perform chromatin immunoprecipitation by extracting the chromatin from the tumour cells and using antibodies for different chromatin marks to see what has changed between the normal cells and the tumor cells. E.g. H3K9me3, H3K27me3. You would perform a pull down with the antibody of interest and then PCR for your promoter to specifically look at changes at that gene compared to normal cells. To test DNA methylation, you could perform bisulfite sequencing.

To see how transcription is affected, you could extract RNA from the tumor and normal cells, and compare the levels of RNA between the two samples by qRT-PCR

3 0
3 years ago
Athletes and physically active people have increased needs for
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Carbohydrates is the primary source for energy and active people apparently need more energy for their daily activities.

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Iron helps the production of hemoglobin, which is in the red blood cells that help transport oxygen. As they exercise more, they need more oxygen supply for respiration, therefore there is a need for iron supply.
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3 years ago
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