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Harlamova29_29 [7]
3 years ago
8

There are two main types of chromosomal disorders, those that take place on the 21st pair of chromosomes and those that ________

______.
Biology
1 answer:
vampirchik [111]3 years ago
7 0

Down syndrome and Alzheimer's disease.

Down syndrome is a chromosomal disorder which is caused by the presence of extra copy of chromosome  21. Therefore also called as Trisomy 21.

Alzheimer's disease is a most common form of dementia(reduction in brain functioning). It is caused by mutation in single gene APP (Amyloid Precursor Protein) present on chromosomer 21.

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A sample of DNA contains 120 nucleotides, if 35 nucleotides are Guanine, how many nucleotides are Thymine?
Vitek1552 [10]

Answer:

25

Explanation:

In DNA, Guanine pairs with Cytosine, and Thymine pairs with Adenine. This tells us that there are equal numbers for each Guanine and Cytosine, and Thymine and Adenine. When there's 35 Guanine, there should be 35 Cytosine that goes with it. 120 - 2(35) = 50. The remaining 50 nucleotides are Thymine and Adenine, and since they are the same number, divide 50 by 2. 50 ÷ 2 = 25. There are 25 thymine in the sample of DNA.

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When selecting food, the most nutritious option is to select whole foods.<br> O True<br> O False
Leya [2.2K]

Answer:

true

Explanation:

Eating more whole foods will help you cut down on calories from the added fats and sugars we get from processed and fast foods. Whole grains. You might think the benefits of whole grains have mostly to do with fiber, but there's so much more than that

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Hormones that help regulate blood calcium levels are made by the A. parathyroid gland. B. pancreas. C. thymus gland. D. adrenal
Kryger [21]
The correct answer is A, parathyroid gland.

The parathyroid hormone is secreted by the parathyroid gland which <span>inhibits osteoblasts, stimulates osteoclasts,</span> reduces the calcium output by the kidneys and promotes absorption of the calcium by the small intestines. Calcitonin, secreted by the thyroid gland, also works to a similar effect.
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Akimi4 [234]

Answer:

i like them big so i wouldnt know

Explanation:

Iemme stop lol

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Some factors that might causes changes in the population of grasshoppers are:

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