Some bacteria exhibit a primitive form of behavior in that they can sense the properties of their environments and use that ability to make adaptive responses. Which of the following are NOT capabilities of any known bacterium?
A. orientation with respect to the Earth's magnetic field
B. move to other bacteria and aggregate with them in response to chemical signals
C. find nutrients by moving upward in the water column with the aid of flotation devices
D. respond to other individual bacteria and transmit DNA via conjugation
E. none of the other options presented
E. none of the other options presented
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A mutation in the RecC subunit of the RecBCD complex would likely have what effect?
A. The enzyme would be unable to recognize chi sites, unwinding and degrading both strands. B. The 3'-ending strand would be degraded faster than the 5'-ending strand. C. The enzyme would not be able to bind RecA. D. The enzyme would be unable to carry out its major function, which is fork regression. E. The enzyme would be able to perform strand invasion without RecA.
Which of the following is referred to as a hollow ball of cells?
a. cleavage b. egg c. gastrula d. zygote e. blastula
Which of the following is NOT true of the
H5N1 virus? a. It is symptomless in pigs. b. It has a high mortality rate in humans. c. It cannot infect birds. d. It moves poorly from human to human. e. It can move between pigs
Because group selection _________________, it very rarely occurs.
a) is beneficial for the species b) is detrimental to the population c) decreases the reproductive success of individuals d) has no effect on allele frequencies e) increases the reproductive success of individuals