Which group of organisms has an exoskeleton?
a. annelids
b. arthropods
c. cnidarians
d. roundworms
e. flatworms
ANSWER: b
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If goats are crossed with sheep, embryos will form but cease development and spontaneously abort. This is an example of
A. a prezygotic mechanism. B. hybrid inviability. C. hybrid sterility. D. hybrid breakdown. E. spermatic behavior.
For which axon might you expect action potential propagation to be the fastest?
a. a myelinated axon with a small diameter b. an unmyelinated axon with a small diameter c. a myelinated axon with a large diameter d. an unmyelinated axon with a large diameter e. axon myelination and diameter do not affect action potential propagation rate
__________ are cells that synthesize bone, whereas __________ break bone down. Fill in the blank(s) with the appropriate word(s)
Which of the following statement concerning structural genes is FALSE?
a. Most structural genes encode a single polypeptide. b. Coding regions always contain introns. c. There may be noncoding regions at the end of the gene. d. A single DNA sequence can sometimes code for more than one polypeptide. e. All of the above are true