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mote1985 [20]
2 years ago
10

Which option(s) correctly describes chromosomes?

Biology
1 answer:
laiz [17]2 years ago
8 0

Answer:In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

Chromosomes are not visible in the cell’s nucleus—not even under a microscope—when the cell is not dividing. However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope. Most of what researchers know about chromosomes was learned by observing chromosomes during cell division.

Each chromosome has a constriction point called the centromere, which divides the chromosome into two sections, or “arms.” The short arm of the chromosome is labeled the “p arm.” The long arm of the chromosome is labeled the “q arm.” The location of the centromere on each chromosome gives the chromosome its characteristic shape, and can be used to help describe the location of specific genes.

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Suggest appropriate sources of food to meet their requirements for a Newborn baby and child aged 6.
pashok25 [27]

Explanation:

Calcium . Helps build strong bones and teeth.

Fat. Creates energy, helps the brain develop, keeps skin and hair healthy, and protects against infections.

Folate. Helps cells divide.

Iron. Builds blood cells, and helps the brain develop. Breast-fed babies should receive iron supplements.

Protein and carbohydrates. They provide energy and fuel growth.

Zinc. Helps the cells grow and repair themselves

Your baby also needs vitamins such as:

Vitamin A. Keeps skin, hair, vision, and the immune system healthy.

Vitamin B1 (thiamine). Helps the body turn food into energy.

Vitamin B2 (riboflavin). Helps the body turn food into energy, and protects cells from damage.

Vitamin B3 (niacin). Helps the body turn food into energy and use fats and protein.

Vitamin B6. Keeps the brain and immune system healthy.

Vitamin B12. Keeps nerve and blood cells healthy, and makes DNA -- the genetic material in every cell.

Vitamin C. Protects against infections, builds bones and muscles, and helps wounds heal.

Vitamin D. Helps the body absorb calcium from food, and keeps bones and teeth healthy. Breast-fed babies may need a D supplement.

Vitamin E. Protects cells from damage, and strengthens the immune system.

Vitamin K. Helps the blood to clot.

hope this was helpful

8 0
3 years ago
Read 2 more answers
Describe how the presence of lead in body cells could interfere with the
ahrayia [7]

Answer:

Descreva como a presença de chumbo nas células do corpo pode interferir com o capacidade de funcionamento das enzimas. *

Explanation:

espero ter ajudado boa noite

3 0
2 years ago
Choose the correct answer from the list.
stich3 [128]

Answer:

1, Promoters

2.transcription bubbles

3. transcription

4. repressors

5. Primers

6. consensus sequences

Explanation:

.1.  DNA sequences that direct RNA polymerase to the initiation site are called _____Promoters _________.

2. RNA synthesis complexes containing DNA, RNA, and polymerase are called ___transcription bubbles___________.

3. RNA synthesis (tRNA, mRNA, and rRNA) in general is called _______transcription_______.

4. The expression of beta-galactosidase requires the induction of operons by removal of _repressors_____________.

5. Unlike DNA synthesis, RNA synthesis does not require ___primers___________.

6. ___consensus sequences___________ are deduced by comparing many related DNA sequences.

7 0
3 years ago
Will give brainlist
MAVERICK [17]

Answer: c deltas

Explanation: hope this helps

3 0
2 years ago
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Which of the following is true regarding extinction?
bija089 [108]
I would say that B) single events or several causes working together to produce extinction in a short period is referred to as mass extinction, but I am not 100% sure. 
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