_____ tends to keep populations of a species similar to one another

a. Genetic drift
b. Gene flow
c. Mutation
d. Natural selection


B

Biology & Microbiology

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Chemical signals that are released by one cell and act locally on neighboring cells are referred to as:

A. paracrine signals. B. autocrine signals. C. hormones. D. pheromones. E. neurotransmitters.

Biology & Microbiology

Four of the five processes listed below are functions

of the human digestive organs. Select the exception. a. excretion b. absorption c. motility d. secretion e. digestion

Biology & Microbiology

Seventy percent alcohol is effective against

A) enveloped viruses. B) nonenveloped viruses. C) bacterial endospores. D) protozoan cysts. E) prions.

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Which of the following processes does not contribute to the exchange in capillary beds of substances between the blood and the tissues?

a. Active transport by white blood cells b. Endocytosis and exocytosis c. Diffusion d. Blood pressure at the arterial end of a capillary e. Bulk flow through pores in the capillary wall

Biology & Microbiology