New species evolve from preexisting species by the accumulation of ______.

A. metabolic events
B. genetic mutations
C. proteomes
D. reproductive events
E. developmental events


B. genetic mutations

Biology & Microbiology

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You are examining a primitive vertebrate and want to determine whether the same part of its brain coordinates muscular movement as in the human brain, so you would do a surgical experiment to disconnect the rest of the brain from the

A. cerebellum. B. hypothalamus. C. medulla oblongata. D. pons. E. cerebrum.

Biology & Microbiology

Memory cells may inhibit the immune response after an antigen has been neutralized.

a. true b. false

Biology & Microbiology

What are the vasa recta?

a. looped extensions of the afferent arterioles b. looped extensions of the efferent arterioles c. regions of the renal tubule d. vessels that supply blood to the glomerulus e. vessels that supply blood to the proximal convoluted tubule

Biology & Microbiology

Four of the following are characteristics of viruses. Which one is the exception?

A. The outer coats of all viruses are alike. B. The virus contains either DNA or RNA at its core, but not both. C. Viruses infect organisms in all three domains of life. D. Most viruses have a protein coat or covering. E. Viral envelopes consist of host cell membrane.

Biology & Microbiology