Which of the following best describes the movement
of sucrose in this system?
a. Sucrose moves in both directions, but net
movement is from A to B.
b. Sucrose moves only from A to B.
c. Sucrose moves in both directions, but net
movement is from B to A.
d. Sucrose moves only from B to A.
e. There is no net movement of sucrose.
Answer: e
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Historically, fishermen kept larger adult fish and left smaller adult fish. Over time, the average size of the fish would
A. increase by genetic drift. B. decrease by genetic drift. C. remain unchanged. D. decrease by natural selection. E. increase by natural selection.
A population of T cells was stimulated to proliferate in response to a particular antigen. A sample of 1000 stimulated cells was analyzed by fluorescence-activated cell sorting (FACS) for total DNA content
Of the 1000 cells, 400 had a 2n amount of DNA, 200 had a 4n amount of DNA, and the remaining 400 cells had between a 2n and 4n amount of DNA. Additional immunofluorescence analysis revealed that 200 of the cells were in various stages of M phase and that M phase lasted 2 hours. What is the total length of the cell cycle? A) 8 hours B) 12 hours C) 18 hours D) 20 hours E) 24 hours
Chromosome condensation indicates a cell has entered
A) prophase. B) prometaphase. C) metaphase. D) anaphase. E) telophase.
The term that Darwin used to describe the concept that those with superior physical, behavior or other attributes are more likely to survive than those that are not so well endowed, and thus are more likely to pass their traits to the next generation, is called:
A. superior beings B. biological diversity C. natural selection D. survival of modifications E. geometric progression