The first step in base excision repair is
A) removal of a double-stranded fragment of damaged DNA.
B) nicking the backbone of one DNA strand.
C) recognizing and excising the incorrect base from a nucleotide.
D) removing extraneous groups such as methyl or oxygen added by mutagens.
E) replacing an A-T base pair with a C-G base pair.
C) recognizing and excising the incorrect base from a nucleotide.
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Adaptations to terrestrial environments evolved independently in arthropods, mollusks, nematodes, and annelids. What logical conclusion would you make from this statement?
A) All these groups have a coelom. B) The common ancestor of all these groups was probably aquatic. C) All these groups have the same type of body plan. D) All these groups lost their coelom after moving to land.
Which of the following is an example of a postmating mechanism that limits formation of a hybrid offspring?
a. temporal isolation b. ecological isolation c. hybrid inviability d. geographic isolation e. behavioral isolation
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What will be an ideal response?
A patient has had a cough, fever, and night sweats for many weeks. Now, sores on the mucous membranes of his mouth are appearing. His history states he spent time in the jungles of Central America. He may be suffering from
A) paracoccidioidimycosis. B) histoplasmosis. C) blastomycosis. D) aspergillosis. E) coccidioidomycoses.