All of the following pertain to Candida albicans, except
A. it is an opportunistic yeast.
B. small numbers found in the mouth, intestines, genitalia, and skin.
C. persistent moist skin influences infection.
D. it has a large capsule.
E. infections often arise from an endogenous source.
Answer: D
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The optimal temperature for most human pathogens might be expected to range from
A. 35-40?C. B. 20-45?C. C. 15-25?C. D. 93-98.6?C.
The International Tundra Experiment provides evidence that
A) the Arctic has risen in temperature by 1-3°C. B) species diversity will increase in the Arctic due to climate change. C) shrubs in the Arctic will have decreased height due to climate change. D) there will be less cover by lichens and mosses due to climate change.
Which one of the following statements CORRECTLY compares the effects of a mutation in a gamete to the effects of a mutation in a somatic cell?
A) Somatic cell mutations always cause cancer, whereas gamete mutations do not. B) Gamete mutations are passed to the next generation, whereas somatic cell mutations are not. C) Gamete mutations are typically deadly, whereas somatic cell mutations are not. D) Somatic cell mutations are typically deadly, whereas gamete mutations are not. E) Mutations in both types of cells usually result in cancer.
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to radioactively label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogen atoms. Thus, labeling the nitrogen atoms would provide a stronger signal than labeling the phosphates. Why won't this experiment work?
a) Although there are more nitrogens in a nucleotide, labeled phosphates actually have 16 extra neutrons; therefore, they are more radioactive b) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long c) Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins d) There is no radioactive isotope of nitrogen