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GarryVolchara [31]
3 years ago
15

Describe the structure and function of nucleic acids.

Biology
1 answer:
Morgarella [4.7K]3 years ago
4 0
Nucleic acids<span> are long chains made of individual, repeated units called monomers. The particular name for the units of </span>nucleic acids<span> are called nucleotides and each contains three things: a phosphate group, a sugar (deoxyribose in DNA and ribose in RNA) and a nitrogenous base. </span>
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Which capillary would be least likely to allow substances to enter or exit the blood due to tight junctions that join the endoth
vodka [1.7K]

Answer:

Those capillaries that have endothelial cells tightly attached have an increase in cell-to-cell junctions, such as desmosomal junctions that are poorly permeable to substances.

These capillaries generally function as conductors or collectors and not as permeabilizers like the pulmonary capillaries that are fenestrated and allow a high passage of substances and gases.

The capillaries are waterproof and prevent the passage of substances or fluids such as in the blood-brain barrier that is very selective

Explanation:

The blood-brain barrier is too selective since it is not favorable for the organism that many fluids, drugs, substances or chemical compounds enter the brain space.

This is the reason why the vessels are waterproof and why pharmacology was challenged to invent drugs that could cross this barrier since it was considered impossible.

An example is dopamine, which in parkynson's disease the levo group is added to dopamine, thus forming levodopamine as a product, this is the only way that the drug crosses the blood-brain barrier and can pass the impermeable barrier generated by capillaries with endothelial cells that are close to each other or closely linked

7 0
2 years ago
Roan coat color in cattle develops through incomplete dominance of the gene for red color and its allele for white. what crossin
slava [35]
<span>Roan is a combination of white hairs with red hairs. When we see cattle like this, they look pink because it resulted from a mix of white and red.

Red allele: A
White allele: a
</span>
<span>A heterozygotic animal has this genotype: Aa
Like i said previously this is the mixture of colors so the animal would be pink.

A red coat color has this genotype: AA
A white coat color has this genotype: aa

To get all the herd to be</span><span> roan-colored cattle the combination of parents should be: AA x aa. -> 100% roan
Another possible way to obtain would be</span><span>roan-colored cattle: Aa x Aa or aa x Aa (in this case there would be less probabable to obtain road).</span>
8 0
3 years ago
Albinism is caused by a recessive mutation. If two albino mice mate and produce offspring with normal pigmentation, what could y
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Answer: A geneticist studies a series of families in which both parents are normal and at least one child has albinism. The geneticist reasons that both parents in these families must be heterozygotes and that albinism should appear in  of the children of these families. To his surprise, the geneticist finds that the frequency of albinism among me children of these families is considerably greater "Than . Can you think of an explanation for the Thigher-than-expected frequency of albinism among These families?

Explanation:

8 0
2 years ago
Does Planet Nine follow Kepler’s Second Law?
lord [1]
Yes, the planet obeys the Kepler's Second Law. It is because it moves at equal time of one month at the same distance.
8 0
1 year ago
Coral reef ecosystems support over a million different species. <br> True or False
Fiesta28 [93]
True millions of different species live on coral reefs
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