Primary xylem and phloem are produced by the
A. protoderm.
B. procambium.
C. leaf primordial.
D. proembryo.
E. ground meristem.
Answer: B
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The key chemical messenger responsible for increasing cardiac output when animals are exercising or under certain stresses is
A. epinephrine. B. acetylcholine. C. dopamine. D. serotonin. E. glutamate.
A mutation is a change in
a. homeostasis. b. the developmental pattern in an organism. c. metabolism. d. DNA. e. the life cycle of an organism.
Which of the following statements about microbes is false?
A) Microbes are parasites, except for eukaryotic microbes. B) All microbes, except viruses, are distributed throughout the three domains of life. C) Microbes have genetic material, except for prions. D) Most microbes are harmless, while others cause disease.
Which of the following statements concerning starvation is true?
a. Ketone bodies are rapidly produced. b. Fat metabolism is greatly reduced. c. There is a risk of the blood becoming too basic. d. There are too many phytochemicals in the blood. e. It is safe for obese individuals to undergo starvation