RNA viruses can use their RNA to produce DNA
because they carry __________ enzymes.
a. reverse transcriptase
b. restriction
c. endonuclease
d. polymerase
e. ligase
Answer: a
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The letter “D” in the above figure represents the
a. style. b. ovary. c. stigma. d. anther. e. filament.
Which of the following layers lies next to the lumen
of the intestinal tract? a. longitudinal muscles b. circular muscles c. submucosa d. mucosa e. serosa
Reptiles evolved from ________ ancestors and were abundant by the ________ period.
A. echinoderms; Cambrian B. fish; Devonian C. amphibians; Permian D. mammals; Carboniferous
In the photosystem I reaction center of green plants, light energy captured by pigment molecules is passed to a special reaction center chlorophyll a called
A. P680. B. P870. C. P700. D. chlorophyll II. E. chlorophyll I.