A young graduate student is trying to identify new species of bacteria based on the criteria of Ernst Mayr
She is having a lot of trouble with this method, and then suddenly realizes that
she can't use Mayr's definition of a species when it comes to bacteria. Why? (Select all
correct choices.)
A. DNA can be passed between bacteria of
different species via horizontal gene transfer.
B. DNA is never passed between bacteria of
different species.
C. Bacteria do not reproduce sexually and/or
do not undergo meiosis.
D. Bacteria form pili and, as a result,
reproduce sexually.
A,C
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What is the primary role of bile salts during
digestion?
a. osmoregulation b. to kill bacteria that may have been consumed c. to coat fat droplets and keep them separated into small droplets d. to enzymatically digest fats e. to do all of these
The portion of the ear that allows for balance control
is indicated by a. A. b. B. c. C. d. E. e. nothing labeled on this figure.
XYY males tend to
a. have reproductive problems. b. be slightly retarded. c. have learning disabilities. d. be sterile. e. develop normally.
Four of the following might be a response to rising body temperature. Which one is the exception?
A. Increased rate of breathing B. Decreased secretion of certain hormones C. More sweat D. Reduced blood flow to skin E. Increased rate of breathing