What is the limitation on size in most arthropods?
a. nutrient availability
b. habitat population density
c. exoskeleton
d. depth of the water
c. exoskeleton
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If a mixture of bacteriophages, some labeled with
radioactive sulfur and others labeled with radioactive phosphorus, is placed in a bacterial culture, the bacteria will eventually contain a. radioactive sulfur. b. radioactive phosphorus. c. both radioactive sulfur and phosphorus. d. neither radioactive sulfur nor radioactive phosphorus. e. complete viruses with radioactive sulfur coats.
Which is most closely related to the hagfish?
A) Shark B) Tunicate C) Lamprey D) Lancelet
A positive-strand RNA virus:
A) must first be converted to a mRNA before it can be translated. B) can be used directly to translate viral proteins. C) will be degraded by host enzymes. D) is not recognized by host ribosomes.
Bacterial cell walls that are resistant to drying contain
A) carbohydrates. B) amino acids. C) lipopolysaccharide. D) tubulin. E) waxes.