A study of certain nuclear genes in humans and chimpanzees shows that the two species differ in 5 percent of their DNA bases. Base substitution mutations occur at a rate of 1 percent per one million years. How many million years ago did these species diverge?
A) 0.5
B) 1
C) 3
D) 5
D) 5
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A human normally has how many vertebrae?
A. 33 B. 17 C. 12 D. 45
Identify the features unique to protostome development.
A. Coelom forms by a splitting of the mesoderm, the blastopore becomes the anus, and the cleavage is spiral. B. Coelom forms by a splitting of the mesoderm, the blastopore becomes the mouth, and the cleavage is spiral. C. Coelom forms by a splitting of the mesoderm, the blastopore becomes the mouth, and the cleavage is radial. D. None of the features listed are unique to the protostomes.
When Pavlov's dog salivated after hearing a bell, this exemplified
A. classical conditioning. B. operant conditioning. C. habituation. D. nonassociative learning.
Mycoplasmas are named for the large quantities of mycolic acid in their cell walls.
Answer the following statement true (T) or false (F)