The following are found in the cell wall of certain bacteria. Which of the following is exclusively found among fungi?
A. Teichoic acid
B. Diaminopimelic acid
C. Peptidoglycan
D. Chitin
Ans: D. Chitin
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A phenotypic technique that examines an organism's susceptibility to bacterial peptides (proteins) is:
a. biotyping. b. antibiograms. c. serotyping. d. bacteriocin typing.
A mutation that affects Ca++ binding to calmodulin is most likely to interfere with what aspect of a signal transduction pathway?
A. The flow of Ca++ ions through ion channel receptors B. The cellular response to the second messenger C. The MAP kinase cascade D. G protein activity
In males, what is the purpose of the urethra?
A) It provides passage from the body for sperm. B) It produces sugars that sperm use for energy. C) It contains the testes. D) It fills with blood during sexual arousal.
Which of the following is not a type of intrinsic reproductive isolation?
a. Geographic isolation b. Mechanical isolation c. Behavioral isolation d. Gametic isolation e. Temporal isolation