Primary amoebic meningoencephalitis is caused by
A) Listeria meningitis.
B) Cryptococcus neoformans.
C) Trypanosoma brucei.
D) Toxoplasma gondii.
E) Naegleria fowleri.
Answer: E
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The structure labeled "E" is formed
a. under favorable conditions. b. under unfavorable conditions. c. by mitosis. d. by meiosis. e. by fusion of individual cells.
Which of the following is TRUE about the
spores of seed plants?
a. megaspores develop into female gametophytes b. meiosis produces four megaspores c. microspores enlarge to become megaspores d. megaspores are diploid cells e. microspores undergo meiosis to form four pollen grains
Which functional groups have been altered in a ddNTP compared to a dNTP?
A) The ddNTPs have a 2? OH and a 3? H, while dNTPs have a 2? H and a 3? OH. B) The ddNTPs have a 2? H and a 3? H, while dNTPs have a 2? H and a 3? OH. C) The ddNTPs have a 2? OH and a 3? OH, while dNTPs have a 2? H and a 3? H. D) The ddNTPs have a 2? H and a 3? H, while dNTPs have a 2? OH and a 3? OH. E) The ddNTPs have a 2? H and a 3? OH, while dNTPs have a 2? H and a 3? H.
A fur color gene in rabbits has a white dominant (W) and brown recessive allele (w). The environment changes suddenly and none of the white rabbits survive. In a population of 10,000 rabbits the initial frequency of W in the pool was 0.7. How many generations would be required to eliminate all W alleles from the population? Assume that there is no mutation and the population meets all other Hardy-Weinberg conditions.
A. 1 B. 5 C. 2 D. 20 E. It can never be eliminated.