The genus Staphylococcus is characterized by all of the following EXCEPT:
A. Catalase positive
B. Productions of cytotoxins
C. May be a part of the normal bacteria flora
D. Staphylococcus aureus is the most virulent strain
E. The bacterial cell wall is composed of peptidoglycan, teichoic acid, and LPS
Ans: E. The bacterial cell wall is composed of peptidoglycan, teichoic acid, and LPS
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Which of these is not a method used by ectotherms to affect body temperature?
A. countercurrent heat exchange B. basking in the sun C. shivering D. dilation or contraction of blood vessels E. increasing metabolic rate
The cytoplasmic membrane of bacteria
A. acts as a selectively permeable barrier, allowing some molecules to pass while preventing the movement of others. B. is the major site of ATP synthesis in aerobes. C. retains the cytoplasm and its contents. D. All of the choices are correct.
Mechanoreceptors in the _____ send signals to the brain about the body's position relative to ravity
a. eye c. tounge b. ear d. nose
A vertebrate's circulatory system would include:a
open blood vessels. b. closed blood vessels. c. hemolymph. d. a hemocoel. e. hemocyanin