Which reefs are directly impacted by human activity the most?
a. Barrier reefs
b. Fringing reefs
c. Patch reefs
d. Atolls
b
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Archaea and bacteria are involved in which of the following cycles? (Select all correct choices.)
A. the nitrogen cycle B. the carbon cycle C. the sulfur cycle
Which of the following statements about DNA replication is INCORRECT?
A. It begins at multiple origins of replication sites along eukaryotic chromosomes. B. It proceeds with the addition of new nucleotides to the 3? end of a growing DNA strand. C. It is powered by the hydrolysis of ATP. D. Each strand within the DNA double helix is used as a template for synthesis of a new strand. E. It requires that both strands of the double helix be separated from each other
A population of voles (small mammals) live in a shady forest. Originally, the voles are a light tan color, but then a dark brown coloration arises by a new mutation. The darker voles are harder for predators to see in the leaf litter, thus they are less susceptible to predation. After 10 generations the majority of voles in the population are the dark brown color. In the figure below, the solid red line represents the number of light colored individuals before the mutation and the black dashed line represents the number of dark brown individuals after 10 generations. What type of natural selection are the population of voles going through?
A. Directional selection.
B. Stabilizing selection.
C. Diversifying selection (disruptive selection).
D. Balancing selection.
E. Negative frequency-dependent selection.
Persons with asymptomatic infections may be (contaminants/reservoirs/zoonoses) of disease.
Fill in the blank(s) with the appropriate word(s).