The presence of ________ can be used to distinguish Staphylococcus from other Gram-positive cocci
A) enterotoxins
B) catalase enzyme
C) protein M
D) kinases
E) hemolysins
B
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Describe how mutations can lead to whole populations of bacteria becoming resistant to certain antibiotics
What will be an ideal response?
You have inoculated a Clostridium species into a tube of media. After incubation, you observe that there is no growth, and you remember that Clostridium is an obligate anaerobe. What is the best explanation for the observed lack of growth?
A. There is not enough oxygen for use when toxic oxygen is present. B. There is not enough water in the environment for Clostridium to grow. C. Oxygen in the medium destroys the enzymes needed by Clostridium to undergo aerobic respiration. D. Clostridium does not have enzymes to process toxic oxygen.
There are how many different kinds of RNA
codons? a. 3 b. 12 c. 28 d. 64 e. 120
Which of the following is incorrect concerning a
nerve net? It a. is found in animals with radial symmetry. b. is responsive to information arriving from any direction. c. shows evolution of cephalization. d. controls cells with contractile properties. e. receives information from sensory cells.