Which of the following is true of viruses in the extracellular phase?
A. They possess many different enzymes and they can reproduce independently of living cells but only at a slow rate.
B. They possess many different enzymes.
C. They can reproduce independently of living cells but only at a slow rate.
D. They behave as a macromolecular complex and are no more alive than are ribosomes.
Answer: D
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What will be an ideal response?
Polyunsaturated fats
a. have fewer hydrogen atoms than do saturated fats. b. are more characteristic of animal fats than plant fats. c. have no double bonds. d. are solid at room temperature. e. are none of these.
Peptide hormones, amino acid-derived hormones, and steroid hormones are types of
A) hormone receptors. B) neurotransmitters. C) endocrine hormones. D) paracrine hormones. E) local hormones.
The minimal amount of nutrients needed every day by healthy people to prevent nutrient deficiencies is called the
A) RDA, Recommended Dietary Allowance. B) minimum mineral requirements. C) minimum vitamin requirements. D) varied diet of minerals and vitamins.