Proteins are macromolecules composed of long strings of single units called nucleic acids.
a. true
b. false
Answer: b. false
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In Darwin's time, natural selection was thought to be primarily negative. However, we have since learned that positive selection is a powerful force, and it
A) creates new gene variants that enhance the phenotype. B) retains gene variants or combinations that promote successful reproduction. C) enables people to resist infectious diseases. D) enables us to alter our genotypes.
Which pairing of nerves and functions is part of the peripheral nervous system?
a. somatic nerves; flight-fight response b. autonomic nerves; control skeletal muscle c. autonomic nerves; control internal organs d. parasympathetic neurons; prepare body for danger e. sympathetic neurons; housekeeping tasks in the body
You see a killifish jumping around on the surface before it is consumed by a bird. You conclude the fish was
A) trying to scare off the predator. B) hunting for flying insects. C) infected with a trematode. D) starving to death.
Which of the following is a symptom of vitamin A deficiency?
a) severe combined immunodeficiency disease (SCID) b) blindness c) anemia d) fast-flushing e) overstimulation of the immune system