You label cells with a radioactive isotope of sulfur (35S). The only molecules that would be radioactively labeled in these cells are:
A. Proteins
B. Carbohydrates
C. Nucleic acids
D. Lipids
A
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The frequency of recombination is expressed as the ratio of recombinants to the total number of progeny
A. true B. false
At the point in the cell cycle when mitosis begins
A) DNA replication begins. B) each chromosome consists of two identical chromatids joined at the centromere. C) the number of chromosomes is reduced to half. D) the cell enters a dormant phase.
Which of the following statements concerning a secondary immune response is false?
a. It is a response to an antigen. b. It may occur years after a primary response. c. It involves memory cells. d. It has a longer latent period than a primary response. e. It is stimulated by less antigen than in a primary response.
Increased atmospheric CO2 concentrations might have what effect on seawater?
A) Seawater will become more alkaline, and carbonate concentrations will decrease. B) There will be no change in the pH of seawater, because carbonate will turn to bicarbonate. C) Seawater will become more acidic, and carbonate concentrations will decrease. D) Seawater will become more acidic, and carbonate concentrations will increase.