Which organism obtains energy by removing electrons from inorganic molecules?
A. Chemoautotroph
B. Chemoheterotroph
C. Photoautotroph
D. Photoheterotroph
E. Electroautotroph
Answer: A
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Which of the following is not generally true about fatty acids produced by microorganisms?
A. Gram-positive bacteria often make cyclopropane fatty acids. B. Fatty acids are monocarboxylic acids. C. Fatty acids have long alkyl chains. D. All of the choices are correct.
The presence of trans fats in membranes ________ the transition temperature and ________ membrane fluidity.
Fill in the blank(s) with the appropriate word(s).
Frances Redi disproved spontaneous generation by designing a controlled experiment where he placed raw meat in six (6) jars. He covered three jars with a fine net and left three jars open. After a short period, maggots appeared in the open jars while the covered jars had no maggots. In your opinion, what additional controls and measurements could Frances Redi have done to prove that rotting of raw meat is caused by live bacteria?
What will be an ideal response?
The eye is a warm, moist environment favored by many harmful bacteria. Nevertheless, eye infections are relatively rare. Why is this?
A) Tears contain the antibacterial enzyme lysozyme. B) The eyes are constantly exposed to UV light, which inhibits bacterial growth. C) Antibodies, particularly IgM, are secreted in abundance in the tears. D) The enzyme tearase inhibits bacterial growth.