Trees often produce secondary chemicals to deter herbivores from feeding on their leaves; in turn, many herbivores have developed ways of avoiding or detoxifying these chemicals. This is an example of
A) competitive exclusion.
B) coevolution.
C) parasitic evolution.
D) parasite predation.
E) predatory avoidance.
B
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What is one reason why tumor-suppressor genes make poor druggable targets?
A) Cancer-causing mutations in tumor-suppressor genes result in loss of function. B) Mutant alleles of tumor-suppressor genes generally result in a greater activity of the protein, which makes inhibiting the proteins more difficult. C) Most drugs cannot distinguish the normal and mutant forms of the tumor suppressor proteins. D) Drugs that can target-tumor suppressor proteins are difficult to deliver to cancer cells.
Which does NOT occur in prophase I of meiosis?
a. cytokinesis b. formation of groups of four chromatids c. homologue pairing d. crossing over e. condensation of chromatin
Restriction enzymes recognize and cut DNA at specific nucleotide sequences. Indicate whether the statement is true or false
Plant hormones
A) must be produced in large quantities to be effective. B) act on all cells they encounter. C) are chemical signals that influence growth and development. D) are rare and produced only in response to stress.