How does the sexual life cycle increase the genetic variation in a species?

A) by allowing independent assortment of chromosomes
B) by allowing random fertilization
C) by allowing crossing over
D) A and B only
E) A, B, and C


Ans: E) A, B, and C

Biology & Microbiology

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A photoreceptor in seeds detects the ratio of red to far-red light, preventing seeds from germinating when:

A. it is too warm. B. it is too cold. C. they are in the shade of another plant. D. they are in direct sunlight. E. it is too dry.

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Viruses that infect bacteria are specifically called ________.

A. prions B. satellite viruses C. viroids D. bacteriophages

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Which is a component of the fossil record?

A. bones of dinosaurs B. the distribution of murid rodents in Australia and Asia C. information about geological formations

Biology & Microbiology

Suppose the regression line to describe the relationship between Y and a dichotomous treatment (X = 1 for treated, = 0 untreated) is given by Y = 4 + 3X. Suppose that one of the observations that was treated was observed to have an outcome, Y = 8. For this observation, what is the residual?

A. 7 B. 0 C. 1 D. -1

Biology & Microbiology