A mutation prevents division of the generative cell in a flowering plant. Where would this mutation most likely manifest itself?
A. Anther
B. Style
C. Ovary
D. Ovule
Answer: B
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Two tubes are inoculated from one test tube of a bacterial culture. The cultures are then transferred every day for 2 months. All of the media and growth conditions are the same in every tube
After 2 months of cultivation, the fitness and genotype frequencies of the populations in the two tubes are compared. The fitness of the two cultures is the same, but the genotype frequencies are very different in the two cultures. How is this possible? A) Two months is not long enough for different fitness levels to evolve even if the genotype frequencies change. B) This result is not possible because different genotype frequencies would result in different fitness levels under the same growth conditions. C) Natural selection caused the evolution of different genotype frequencies within the separate test tubes. D) Genetic drift within the small populations in the test tubes resulted in different genotype frequencies.
Which of the following statements about the strands of a newly replicated DNA molecule is correct?
A. Both strands are made up of newly assembled nucleotides. B. One strand is new and the other is from the original molecule. C. Both strands contain some nucleotides from the original molecule. D. The sugar-phosphate chains are conserved and new bases are inserted between them. E. The base pairs are conserved and new sugar-phosphate backbones are built up on them.
A deoxyribonucleotide is composed of:
A. a nitrogenous base and a deoxyribose. B. a nitrogenous base, a deoxyribose, and a phosphate group. C. a nitrogenous base, a ribose, and a phosphate group. D. a nitrogenous base and a ribose. E. a deoxyribose and a phosphate group.
Desiccation, a time-honored method of preserving food, is effective because the
A. heat of the process kills microbes. B. freezing step of the process kills microbes. C. salt concentration is too low to support metabolic function. D. UV light used in the process of sun drying penetrates effectively. E. water content is too low to support metabolic function.