Viruses are not considered to be alive, yet they share this ability with living cells:
a. They can metabolize food
b. They can evolve
c. They can reproduce on their own
d. They can produce cell membranes
e. They can synthesize proteins
Answer: b. They can evolve
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In spite of their heterogeneity, steroid hormones:
A. have the same effect on different types of cells. B. bind to cell-surface receptors. C. bind intracellular receptors to form complexes that migrate to the nucleus. D. are hydrophilic small molecules that bind to intracellular receptors. E. facilitate the initiation of translation by ribosomes.
Which of the following organelles contain DNA?
a. mitochondria and nucleus b. mitochondria and ribosomes c. ribosomes and nucleus d. ribosomes and lysosomes
What is ethylene?
a. a food source for the developing embryo b. a ripening hormone c. a substance to discourage animals from eating fruit d. a type of nectar
Which animal belongs to a subgroup of arthropods
different from that of the other four? a. horseshoe crab b. shrimp c. mite d. spider e. scorpion