The sutures of the skull are examples of a _____ joint
synovial
cartilaginous
fibrous
hyaline
C. fibrous
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The promoters of positively controlled operons require activator proteins, because
A) RNA polymerase easily recognizes the consensus sequence. B) they are required to inactivate the repressor proteins. C) the promoters have nucleotide sequences that bind RNA polymerase weakly, which are not close matches to the consensus sequence. D) they are needed to bind to the allosteric site of RNA polymerase.
Telomere integrity in cancer cells is the result of
A) natural cell aging. B) active telomerase activity. C) exchange of DNA between chromosomes. D) viral infection. E) both choices B and C
If a cell of C. elegans is preparing for division but fails the G2 checkpoint, which of the
following is likely to occur?
a. It will enter the mitotic phase. b. It will undergo cytokinesis. c. It will undergo apoptosis. d. DNA replication will occur.
In the case of the red harvester ant, colonies that survive to ____ years of age are likely to contribute to the next
generation of colonies.
a. one b. three c. four d. seven e. ten