1. What is meant by the description \"antiparallel\" regarding the strands a The

Question

1. What is meant by the description "antiparallel" regarding the strands a The twisting nature of DNA creates nonparallel strands a. b. c. d. The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand Base pairings create unequal spacing between the two DNA strands One strand contains only purines and the other contains only pyrimidines 2. At a specific area of a chromosome, the sequence of nucleotides below is present where the chain opens to form a replication fork: 3, ? ? T A G G C? G C A AT C C 5. An RNA primer ?s formed starting at the underlined T (T) of the template. Which of the following represents the primer sequence? 5, G C C T A G G 3, a. b. 5' ACGTTAGG 3 5, A C G U U A G G 3. c. d. 5' G CCUAGG 3 3. What is the function of DNA polymerase in DNA replication? To unwind the DNA helix during replication a. b. To seal together the broken ends of DNA strands To add nucleotides to the 3' end of a growing DNA strand To degrade damaged DNA molecules c. d. 4. The leading and lagging strands differ in that The leading strand is synthesized continuously and the lagging strand is synthesized in the opposite direction in short fragments a. b. The leading strand is synthesized by adding nucleotides to the 3 end of the growing strand and the lagging strand is synthesized by adding nucleotides to the 5' end The lagging strand is synthesized continuously, whereas the leading strand is synthesized in short fragments that are ultimately stitched together c. The leading strand is synthesized at half the rate of the lagging strand d. 5. The process by which DNA reproduces itself is a. Protein synthesis b. Aerobic respiration c. Replication d. Substrate phosphorylation During which stage of the cell cycle is DNA duplicated? a. G1 b. G2 ?.? d. S 6. 7. What amino acid sequence will be generated, based on the following mRNA codon sequend 5' AUG-UCU-UCG-UUA-UCC-UUG 3 a. Met-arg-glu-arg-glu-arg b. Met-glu-arg-glu-leu-iso c. Met-ser-leu-ser-leu-ser d. Met-ser-ser-leu-ser-leu

Explanation / Answer

1. Antiparallel means the 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.

2. A primer will be 5' ACGUUAGG 3'

3. DNA polymerase function in replication is to add nucleotides in the 3' end of a growing DNA strand.

4. The leading strand is synthesized continuously and the lagging strand is synthesized in the opposite direction in short fragments.

5. Replication is the process by which DNA reproduces by itself. It means the doubling of DNA.

6. During S stage or synthesis stage of the cell cycle, DNA duplication takes place. It lies between G1 and G2 stages.

7. Met-ser-ser-leu--ser-leu is the amino acid sequence which will be generated from mRNA codon sequence.

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