1. Which base pairs are found in DNA? A. A-C and T-G B. A-T and C-G C. A-G and C
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1. Which base pairs are found in DNA? A. A-C and T-G B. A-T and C-G C. A-G and C-T D. A-U and C-G 2. What type of bond connects base pairs? A. Covalent bond B. lonic bond C. Hydrogen bond 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 divisionsExplanation / Answer
1. According to Chargaff rule, adenine pair with thymine with three hydrogen bonds, whereas cytosine pair with guanine by three hydrogen bonds. Hence, correction option is “B”.
2. Bond is connect with three hydrogen bonds. Hence, correction option is “C”.
3. Each chromosome contain long DNA molecule which consist many genes, hence, correction option is “A”.
4. Telomere is highly repetitive sequences present at the tip of chromosome that protect the lagging strand. Hence, correction option is “B”.
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