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Question 18M.1.HL.TZ2.8

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.1.HL.TZ2.8
Level HL Paper 1 Time zone TZ2
Command term Question number 8 Adapted from N/A
8.
[Maximum mark: 1]
18M.1.HL.TZ2.8

Meselson and Stahl investigated DNA replication by first feeding bacteria with bases containing 15N (heavy), and then with bases containing 14N (light). The results are shown in the photographs.

[Source: © International Baccalaureate Organization 2018]

From this information, what would be the composition of the DNA in generation 3?

A. There will be a single 14N band.

B. There will be a single 15N band and a single 14N band.

C. There will be a darker 14N band and a lighter hybrid band.

D. There will be a single 15N band, a single hybrid band and a single 14N band.

[1]

Markscheme

C

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