2. What type of bond connects base pairs? A. Covalent bond B. Ionic bond C. Hydr

Question

2. What type of bond connects base pairs? A. Covalent bond B. Ionic bond C. Hydrogen bonc 3. Each chromosome contains: A. one long DNA molecule. B. one long RNA molecule. C. one long sequence of amino acids. D. a single gene for a protein. 4. What are telomeres and what do they do? A. ever-shortening tips of chromosomes that may signal cells to stop dividing at maturity B. highly repetitive sequences at tips of chromosomes that protect the lagging strand during replication C. repetitive sequences of nucleotides at the centromere region of the chromosome D. enzymes that are present in germ-line cells that allow those cells to undergo repeated divisions 5. According to Chargaff's rule, the following proportion exists in DNA. B. A-G C. C=T D. T-C E. C=T 6. The sugar found in DNA is A. Sucrose (B) Ribose C. Deoxyribose D. fructose E. glucose

Explanation / Answer

ANSWER 2. C. Hydrogen bonds

Reason- This is because the nitrogen bases G-C are connected by 3 hydrogen bonds whereas the A-T are connected by 2 hydrogen bonds.

ANSWER 3. A. One long DNA molecule

Reason- This is because a chromosome contains a single DNA molecule which is tightly coiled many times around histone proteins.

ANSWER 4. B.

Reason- This is because telomeres protect the chromosomes from fusing together due to presence of highly repetitive sequences at the tip of the chromosomes.

ANSWER 5. A. C=G

Reason- Because according to Chargaff's Rule, the ratio between purine and pyrimidine should be equal and therefore C=G and A=T

ANSWER 6. C. Deoxyribose

Reason- This is because DNA which is the Deoxyribo nucleic acid contains a deoxyribose sugar, nitrogenous bases and the phosphate backbone.

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