Humans are susceptible to scurvy because
A. they cannot synthesize amino acids.
B. they do not have enough adipose tissue for vitamin A storage.
C. they cannot synthesize vitamin C.
D. they have a high incidence of fruit allergies.
E. constant seasickness and nausea on long voyages leads to weakness and anemia.
C. they cannot synthesize vitamin C.
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The nucleolus
A) is surrounded by a thin nucleolar membrane. B) is found, one per cell, in eukaryotes. C) contains the NOR of rRNA genes. D) synthesizes ribosomal proteins. E) all of the above
Methanogens, thermophiles, and halophiles characterize many members of this taxonomic group of microbes
a. Eukarya b. Archea c. Bacteria d. None of the above
In the section "Investigating Life: Evolving Backwards", what was hypothesized about the loss of legs in modern-day snakes?
A. Snakes descended from land-dwelling or marine ancestors. B. Snakes descended only from burrowing lizards on land. C. Snakes descended only from marine lizards. D. Snakes do not have forelimbs or hindlimbs. E. Some extant snakes have forelimbs or hindlimbs.
Which of the following species was once considered so benign that microbiologists used it to trace movements of air currents in hospitals and over cities?
What will be an ideal response?