Suppose you are provided with an actively dividing culture of which radioactive
ID: 99988 • Letter: S
Question
Suppose you are provided with an actively dividing culture of which radioactive thymine has been added. What would happen if a cell replicates once in the presence of this radioactive base? A) Neither of the two daughter cells would be radioactive. B) All four bases of the DNA would be radioactive. C) DNA in both daughter cells would be radioactive. D) One of the daughter cell's, but not the other, would have radioactive DNA. E) Radioactive thymine would pair with nonradioactive guanine. What is meant by the description "antiparallel" regarding the two strands of nucleic acids that make up DNA? A) Base pairings create unequal spacing between the two DNA strands. B) One strand contains only purines and the other contains only pyrimidines. C) The twisting nature of DNA creates nonparalled strands. D) The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand. Which enzyme catalyzes the elongation of a DNA strand in the 5'-3' direction? A) DNA polymerase III B) helicase C) DNA ligase D) primase E) topoisomerase At a specific area of a chromo some, the following sequence of nucleotides is present where the chain opens to form a replicat ion fork: 3'-CCTAGGCIGCAA TCC-5' An RNA primer is formed starting at the underlined T of the template. Which of the following represents the primer sequence? A) 5'-GCCUAGG-3' B) 5'-GCCTAGG-3' D) 5'-ACGTTAG G-3' E) 5'-ACGUUAGG-3' In which order do the necessary enzymes act to repair a thymine dimer by repair? A) DNA polymerase, RNA polymerase, DNA ligase B) nuclease, DNA polyme rase, DNA ligase C) nuclease, DNA polyme rase, RNA primase D) DNA ligase, nuclease, hielicase E) helicase, DNA polymerase, DNA ligase What is the function of DNA polymerase III? A) to degrade damaged DNA molecules B) to seal together the broken ends of DNA strands C) to add nucleotides to the 3' end of a growing DNA strand D) to unwind the DNA helix during replication E) to rejoin the two DNA strands (one new and one old) after replicationExplanation / Answer
15)C. DNA in both daughter cells would be radioactive
When bacteria divide, they generate two new chromosomes out of the original, in which each of the 2 original strands (non radioactive) will serve as a template to which a second strand (radioactive) is build.
16)D. The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
17)A. DNA polymerase III
It is the enzyme that catalyzes the addition of nucleotides complementary to the template strand. it can only add nucleotides on the 3' end of the DNA so it has to move in a 5' - 3' direction.
18)E.5' A C G U U A G G 3
19)B.nuclease, DNA polymerase I, DNA ligase
20)C.to add nucleotides to the 3' end of a growing DNA strand
IT IS THE FUNCTION OF DNAPOLYMERASE 3
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.