Which of the following is the most unique aspect of archaeon cell envelopes?
A. The cell walls contain a modified type of peptidoglycan.
B. The plasma membrane is composed of phospholipids.
C. Archaeon capsules can be composed of protein or polysaccharide.
D. Some archaeons have lipid monolayers in their plasma membrane.
Answer: D
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Which of the following is the major reason why it has been difficult to treat viral infections with chemotherapeutic agents?
A. Viruses have no metabolism and therefore offer no selective point of attack. B. Actually, viruses are not difficult to treat with chemotherapeutic agents. C. Viruses use the metabolic machinery of their hosts, which limits many of the potential points of attack. D. Viral metabolism resembles that of their hosts so there is no selective point of attack.
Which statement is false?
a. A nerve will not fire unless a stimulus exceeds the threshold. b. An action potential is an all-or-nothing event. c. An action potential continues indefinitely until a quenching signal is released. d. An action potential is self-propagating. e. An action potential transmission depends on activities at the membrane.
Which part of the eye contains most of its blood vessels?
a. choroid. b. retina. c. sclera. d. choroid. e. cornea.
Why are scientists debating if viruses are living organisms?
a. They infect other pathogens. b. They are so small. c. They are metabolically inert. d. They don't always have DNA. e. They live inside a host.