The common soil mycobacteria that frequently cause systemic infection and death in AIDS patients is
A. Mycobacterium avium complex (MAC).
B. Mycobacterium kansasii.
C. Mycobacterium scrofulaceum.
D. Mycobacterium fortuitum complex.
E. Mycobacterium marinum.
Answer: A. Mycobacterium avium complex (MAC).
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With regard to cancer cells in the process of metastasis to secondary sites, which of the following statements is not correct?
A) If they enter via lymphatics, cancer cells may multiply in regional lymph nodes. B) Many cells from the primary mass may enter circulation. C) The population of cancer cells in the bloodstream is monoclonal. D) Very few cancer cells survive the bloodstream. E) The population of cancer cells is heterogeneous.
If all the meiofaunal organisms were eliminated from a sandy beach, how would that affect the habitat and the trophic structure of the beach?
What will be an ideal response?
If you mate a donkey (2n = 62) with a horse (2n = 64) you get a mule. Mules are sterile and cannot produce gametes by meiosis because they
A. contain too few chromosomes. B. have an odd number of chromosomes. C. have an even number of chromosomes. D. contain too many chromosomes. E. lack genes that are essential for life.
Island species are especially vulnerable to extinction because may destroy a small island population.
A. the introduction of a new predator B. a single event like a hurricane C. random fluctuations in birth and death rates D. All of the answer choices are correct. E. the extinction of a prey species