Histone Protein

Q.

What are histones? What are their functions?

Q. The net electric charge on DNA and histones is:

1. both positive
2. both negative
3. negative and positive, respectively
4. zero

Q. Refer to the given figure of nucleosome and select the option that correctly identifies the parts A, B and C.

1. A B C
   DNA Histone octamer $H_1$ histone
   
   
2. A B C
   Histone octamer $H_1$ histone DNA
3. A B C
   Histone octamer DNA $H_1$ histone
4. A B C
   DNA $H_1$ histone Histone octamer

Q.

What is the major function of histones?

Q.

Histone proteins have a __ charge.

Q.

Are DNA fragments negatively charged?

Q.

Regarding assertion and reason, select the right option.

Assertion [A]: Charge of DNA molecule is negative.
Reason [R]: Histone proteins associated with DNA are positively charged.

1. Both A and R are false

2. Both A and R are true and R explains A

3. Both A and B are true, but R does not explain A

4. A is true and R is false

Q. Nitrogen bases of DNA are

1. ATUC
2. UTGC
3. AUGC
4. ATGC

Q. The proteins associated with nucleic acids are

1. Scleroproteins
2. Albumins
3. Histones
4. Globulins
5. Lipoproteins

Q. Give reason: Histones are positively charged

Q.

Histone proteins have a __ charge.

Q.

how do histones acquire positive charge in nucleosome?

Q.

Histones contain .......... and .......... amino acids.

1. Lysine and histidine
2. Arginine and lysine
3. Valine and histidine
4. Arginine and histidine

Q. Amino acid present in histones are

1. Arginine and lysine
2. Arginine and cytosine
3. Arginine and histidine
4. Lysine and histidine

Q.

Histone proteins have a __ charge.

Q.

Histone proteins have a __ charge.

Q.

How is the DNA molecule negatively charged??

Q.

Regarding assertion and reason, select the right option.

Assertion [A]: Charge of DNA molecule is negative.
Reason [R]: Histone proteins associated with DNA are positively charged.

1. Both A and R are true and R explains A

2. Both A and B are true, but R does not explain A

3. A is true and R is false

4. Both A and R are false

Q.

Regarding assertion and reason, select the right option.

Assertion [A]: Charge of DNA molecule is negative.
Reason [R]: Histone proteins associated with DNA are positively charged.

1. Both A and R are true and R explains A

2. Both A and B are true, but R does not explain A

3. A is true and R is false

4. Both A and R are false