Gymnosperms were the dominant form of plant life on land:
A) before ferns evolved.
B) about 20 million years ago.
C) around the time the dinosaurs came to dominance.
D) until the discovery of fire by humans.
Answer: C
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Homo erectus _____
a. was the earliest member of the genus Homo b. was one of the australopiths c. evolved in Africa and dispersed to many regions d. disappeared as the result of an asteroid impact
The wild carrot sprigs that starlings add to their nests
function a. as a form of camouflage against predators. b. as a form of insulation. c. to repel parasites. d. to prevent other birds from using the nest. e. in ways that are currently unknown.
The active site for many enzymes
A) contains amino acids that are contiguous to one another along the primary sequence of the protein. B) may require a prosthetic group such as a metal ion. C) involves amino acids that are brought into close proximity by extensive protein folding. D) usually depends on only one amino acid. E) involves amino acids that are brought into close proximity by extensive protein folding and may require a prosthetic group such as a metal ion.
Which of the following results in a normal human female phenotype?
a. XX b. XO c. YY d. XXX e. YYY