Which molecules in replicated DNA strands would be radioactive if the - ProProfs
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Which molecules in replicated DNA strands would be radioactive if the nucleotides used were radioactive?





A. II and III only
B. I and III only
C. I and II only
D. I, II, III and IV

This question is part of Unit 3 The Chemistry of Life
Asked by Kris_french on Jan 18, 2017

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3 Answers

J. connor

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J. connor
Content Marketing executive, MA, Minsk,Poland

Answered on Feb 07, 2019

The correct answer is option A – II and III Deoxyribonucleic acid, commonly known as DNA is the material that carries the genetic information of living organism.

DNA replication is semi conservative, this means that each strand of DNA serves as a template strand, each newly synthesized double helix is a combination of one old (original) and one new DNA strand. During replication, complementary bases old strand are added to the new synthesized strand. Guanine is the complementary base of cytosine, and adenine is the complementary of thymine. I and IV are not correct because they look exactly like the template DNA, but we know that complementary nucleotides are on the newly synthesized strands, not identical strands.

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C. Block

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C. Block
English Professor, M.A, Ph.D, Buffalo

Answered on Jan 29, 2019

The correct answer to this question is A. In the figure, II and III only make the statement true. DNA stands for deoxyribonucleic acid and is a self-replicating material that nearly all living organisms have. DNA carries the organism's genetic information. Cells, which contain DNA, normally divide to multiply, causing the organism to grow, reproduce, and replenish dead cells.

A new replicated DNA molecule only has one radioactive strand. As the double helix divides, one radioactive nucleotide makes up each of the new molecules. Since the original molecule had two distinct nucleotides, the identical I and III cannot be correct.

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John Smith

John Smith

Answered on Jan 18, 2017

II and III only
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