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Naily [24]
3 years ago
8

Describe the structure of DNA ? (6mrks) gcse edexcel 9-1

Biology
1 answer:
m_a_m_a [10]3 years ago
6 0

DNA structure. DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C).

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Which of the following is the best definition of niche?
FrozenT [24]

Answer:

C.

Explanation:

A niche refers to the way in which an organism fits into an ecological community or ecosystem. How an organism interacts with it's environment. So, I believe the answer to be C.

Hope this helps. :)

8 0
3 years ago
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John's class has been studying blood type and donations John is not sure what blood type he has A dinner John asked him mom
Elodia [21]

Answer:

yes to mom will give him an allele for type A and hid Dad will give him

Explanation:

HOPE IT"S RIGHT

4 0
3 years ago
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Chromosome duplications and deletions frequently result in abnormal phenotypes or inviable gametes. Which factor is a major cont
kherson [118]

Chromosome duplications and deletions frequently result in abnormal phenotypes or inviable gametes. Gene dosage is modified is a major contributor to this phenomenon.

In the field of genetics, we can define gene dosage as the quantitative measure or copies of a particular gene that is present in an organism. Abnormalities in the gene dosage at a particular location can cause severe damage to the resulting phenotype.

Gene dosage can lead to chromosome duplications if the copy number or gene product is more and it can cause deletions if the copy number or gene product is less. Such complications will result in abnormal phenotypes or inviable gametes. For example, in Down's syndrome, the person has a modification of the 21st chromosome as there is one extra 21st chromosome present. This leads to a variety of diseases and defects in the person.

Although a part of your question is missing, you might be referring to this question:

Chromosome duplications and deletions frequently result in abnormal phenotypes or inviable gametes. Which factor is a major contributor to this phenomenon?

a. Recessive diseases are unmasked by additional copies.

b. The genes are found in a novel arrangement.

c. Gene dosage is modified.

To learn more about deletions, click here: brainly.com/question/2033407

#SPJ4

4 0
1 year ago
Which activities of the body are controlled by the autonomic nervous system?
bearhunter [10]

Explanation:

The autonomic nervous system controls internal body processes such as the following:

Blood pressure

Heart and breathing rates

Body temperature

Digestion

Metabolism (thus affecting body weight)

The balance of water and electrolytes (such as sodium and calcium)

The production of body fluids (saliva, sweat, and tears)

Urination

Defecation

Sexual response

6 0
3 years ago
What distinct difference did 19th century scientists notice between plant and animal cells?
Leto [7]

Answer:

cell walls, vacuoles, chloroplasts, centriole

Explanation:

Plant cells have cell walls, one large vacuole per cell, and chloroplasts, while animal cells will have a cell membrane only and several smaller vacuoles. Animal cells also have a centriole, which is not found in most plant cells.

5 0
2 years ago
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