In the fractionation of homogenized cells using centrifugation, the primary factor that determines whether a specific cellular component ends up in the supernatant or the pellet is
a. the relative solubility of the component.
b. the size and weight of the component.
c. the percentage of carbohydrates in the component.
d. the number of enzymes in the fraction.
e. the presence or absence of lipids in the component.
b. the size and weight of the component.
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Male northern elephant seals compete with one another for territories along the beach. Males will defend these territories throughout the breeding season
The males that win the male–male competitions defend the "best" beaches, and will have access to mate with females that stay on the beach. Female northern elephant seals (Mirounga angustirostris) come up on a beach during breeding season. Different areas on the beach are defended by a single male; when females haul-out they join a group of females in one specific area on the beach. They disproportionately breed with the male that defends that area of the beach. At what point may intersexual selection occur in these elephant seals? A. when the female is swimming to the beach B. when the female lands on the beach and chooses her resting location C. when the male defends his group of females against a different male D. when the male mates with a female within his group E. when the female leaves the beach after mating with a male
The functional group shown above is ____
a. a carbonyl group b. a hydroxyl group c. a phosphate group d. an amino group e. a carboxyl group
Refer to the accompanying figure. Secretion of potassium and ammonium ions occurs mainly in the portion labeled as:
a. 2.
b. 5.
c. 7.
d. 9.
e. 10.
In biology, an adaptation is defined as _____.
A. a heritable trait that increases the fitness of an individual in a particular environment B. a change in an individual's behavior in response to changes in environmental conditions C. a change in an individual's DNA sequence D. a change in an individual's body in response to changes in environmental conditions