Recent studies have shown that xeroderma pigmentosum (an error in the nucleotide excision repair process) can result from mutations in one of seven genes. What can you infer from this finding?
A) There are seven genes that produce the same protein.
B) These seven genes are the most easily damaged by ultraviolet light.
C) There are several proteins involved in the nucleotide excision repair process.
D) These mutations have resulted from translocation of gene segments.
Answer: C
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According to the clonal selection theory
A. antibodies are modified, at the time of antigen exposure, to specifically react with the antigen. B. self-reactive T cells are killed in the thymus. C. B cells producing autoantibodies are eliminated in the thymus. D. each B cell is already programmed to produce a specific antibody. E. self-reactive T cells are killed in the thymus AND B cells producing autoantibodies are eliminated in the thymus.
Which is not an example of aneuploidy?
A) monosomy B) tetraploidy C) trisomy D) nullisomy
Which statement best describes why O2 and CO2 can both be exchanged simultaneously at the alveoli and pulmonary capillaries?
A) Nitrogen is at a high pressure in both the alveoli and pulmonary capillaries and drives the exchange of O2 and CO2. B) Blood in both the alveoli and pulmonary capillaries is at equilibrium. C) Each gas acts independently and diffuses down its own partial pressure gradient. D) Blood in the pulmonary capillaries is high in both O2 and CO2. E) Blood in the alveoli is high in both O2 and CO2.
Which type of enzyme is most likely to be involved in the loss of fat during exercise?
A. carbohydrase B. lipase C. protease D. trypsin