In E. coli, replication begins at which chromosome site?
A) The replication fork
B) ter
C) oriC
D) TBP
E) All of these
C
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By a __________, transpiration pulls water upward by creating a continuous negative pressure (or
tension) inside xylem from leaves to roots. Fill in the blank(s) with the appropriate word(s).
The advantage of having memory cells in specific defenses is that
A) they remain in an active state, continuously producing antibodies. B) if exposed to an antigen a second time, they quickly become plasma cells. C) they prevent production of other proteins so that antibodies can be produced. D) they produce antibodies and can become phagocytic. E) they prevent viruses from entering the body a second time.
Which term best describes an organism that has a minimum growth temperature of -4oC, an optimum temperature of 10oC and a maximum temperature of 24oC?
a. psycrotroph b. mesophile c. psychrophile d. thermophile e. extremophile
The function of the nucleus is to:
A) produce proteins. B) contain the DNA. C) add sugars to proteins. D) contain the cytoplasm. E) organize the cytoskeleton.