Viruses that enter an inactive phase in which the host cell replicates and passes on a bacteriophage
DNA for generations before the phage becomes active and kills the host are called
a. virulent bacteriophages.
b. bacteriophages.
c. temperate bacteriophages.
d. phages.
e. avirulent bacteriophages.
C
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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. 2 C. 5 D. 20 E. can never be eliminated
What process delivers organic nutrients to abyssal plains and trenches near continental shelves?
a. Decomposition b. Biological magnification c. Turbidity currents d. Marine snow
The presence of which hormone in a mother's
urine indicates that she is pregnant?
a. luteinizing hormone b. follicle-stimulating hormone c. human chorionic gonadotropin d. progesterone e. estrogen
Stage 1 of oxidative phosphorylation requires the movement of electrons along the electron-transport chain coupled to the pumping of protons into the intermembrane space. What is the final result of these electron transfers?
(a) OH– is oxidized to O2 (b) pyruvate is oxidized to CO2 (c) O2 is reduced to H2O (d) H– is converted to H2