A common method used in the diagnosis of giardiasis is detection of Giardia
A) cysts in stool.
B) antigens in blood.
C) antigens in stool.
D) cysts or antigens in stool.
Answer: D
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Many non-LTR (target primed) retrotransposons encode a reverse transcriptase that has an endonuclease activity. What is the primary function of the endonuclease activity?
A. Its primary function is to cleave the 3' end of the transposon and initiate transposition. B. Its primary function is to cleave the 5' end of the transposon and initiate transposition. C. After the RNA intermediate is converted to a double-stranded DNA, the endonuclease cleaves the target site. D. The endonuclease cleaves a phosphodiester bond in the target site, exposing the primer terminus that is required to prime reverse transcription of the RNA intermediate. E. None of choices given describes the function of the endonuclease activity.
Many of the burrowing animals of the mud flat must actively
a. keep digging to exchange gasses. b. circulate water through their burrows. c. live near natural breaks in the sediment for gas exchange. d. maintain an anaerobic environment.
Sexual isolation occurs when the egg proteins bind only complementary molecules on species specific sperm
____________ Indicate whether the statement is true or false.
Place the following organisms in order of appearance in the fossil record, beginning with the earliest
A. ferns, algae, flowering plants, gymnosperms B. amphibians, reptiles, fish, mammals What will be an ideal response?