Which protein is responsible for the ability of flu virus to bind to epithelial cells?
A. capsid protein
B. hemagglutinin
C. CD4
D. major histocompatibility factor
B
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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.
A climograph portrays the particular combination of temperature and rainfall conditions in each terrestrial biome
Indicate whether the statement is true or false.
Compare and contrast the structure and function of the saccule and utricle with that of the semicircular canals with
regard to maintaining equilibrium. What will be an ideal response?
The biological species concept relies mainly on ________ to define a species.
A. reproductive isolation B. the presence of analogous traits C. comparative biochemical analysis D. morphological differences