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Alik [6]
3 years ago
15

When a hormone is present in excessive levels, the number of target-cell receptors my decrease. This is called ____. A. Receptor

recognition B. Paracrine regulation C. Sensory adaptation D. Up-regulation E. Down-regulation
Biology
1 answer:
Ainat [17]3 years ago
4 0

Answer:E. Down-regulation

Explanation:Cells typically up or down  regulate  depending on  the concentration of a hormone levels. When  there is a excessive  concentration of a hormone in the blood stream, the cell decreases the number of receptors reducing  the interaction  with that hormone, Also, when there is excessive  hormone reduction, the  target cells activate to increase their number of receptors.

Down  regulation occurs by the the deactivating or degrading of target cells to reduce the number of  receptors due to their sensitivity to a particular excess hormone.

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What does hetrozygous and homozygous mean
natali 33 [55]
In genetics when an organism is heterozygous that means that it contains 2 different alleles for a specific gene, heterozygous refers to the genotype 
Homozygous means the organism carries 2 of the same alleles.

For example there are two alleles for the gene of eye color 
B- is the dominant allele for brown eyes 
b- is the recessive allele for blue

So if a person's genotype is like Bb then he is heterozygous
but if he is like BB or bb then he is homozygous 
5 0
3 years ago
Explain the process by which an attack of hay fever follows exposure to pollen
Bezzdna [24]

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4 0
3 years ago
Which elements makes up most of earth’s atmosphere
denis23 [38]

Answer:

Which elements makes up most of earth’s atmosphere?

The atmosphere is made up of different elements but the most abundance is Nitrogen with 78% while oxygen and others carries the rest percentage including some inert gases

Explanation:

4 0
3 years ago
Read 2 more answers
bio 102 The atmospheric ozone layer has been __________since the banning of CFCs (chlorofluorocarbons), but a recent report sugg
sergiy2304 [10]

Answer:

protected; increase

Explanation:

Ozone is composed of trioxygen which is highly reactive gas compared to dioxygen. Ozone layer is present in stratosphere and troposphere and protect the humans from ultraviolet radiations but it may be toxic if inhaled. Ozone can be broken down into molecular oxygen by chlorine and bromine atoms.

A hole was discovered in ozone layer in 1982 and scientist believed that it could be dangerous for human health. The compounds involved in depletion of ozone are mainly Chlorofluorocarbons (CFS) and (HFCS). Then a global agreement was signed in 1987 which leads to prohibition of use of all chemicals that are involved in depletion of ozone layer. The problem of ozone depletion is solved by the agreement and ozone hole started to recover it from 2000.

But recent reports showed that the alternative chemicals used to protect the depletion of ozone layer began to trap the heat inside the earth like greenhouse effect. Now scientists are in search of chemical that can prevent both ozone depletion as well as global warming.

3 0
3 years ago
Which statement identifies an example of a genetic factor that could influence the growth or development of an organism created
qaws [65]

Answer:

fertilizer creating a mutation among a farmer's crops

Explanation:

A genetic factor is one that affects the gene or genome of an individual organism. This genetic factor often influences the observable trait called PHENOTYPE of the organism. In this case, an example of a genetic factor that could influence the growth or development of an organism created by an environmental factor is the "fertilizer creating a mutation among a farmer's crops"

The fertilizer represents the environmental/chemical factor which is creating the genetic factor (mutation) that will eventually influence the growth or development of the crops.

8 0
3 years ago
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