Which of the following statements concerning archaea in the microbiome is correct?
A. The human body is a hostile environment for archaea.
B. Archaea evolved under extreme conditions and are not commensal with humans.
C. Archaeal infections are treated with translation inhibitors, as their ribosomes are the same as bacterial ribosomes.
D. Methanogens are associated with anaerobic regions of the gut and the gingival pockets.
Answer: D
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A child swinging on a swing utilizes which type (or types) of energy?
a. kinetic energy only because the child is in constant motion b. potential energy only, because the child has to invest energy to get the swing to go c. chemical energy only, because it is the child's metabolism that powers the muscles that make the swing move d. kinetic and potential energy only, but in constantly changing ratios: when changing direction it is pure potential energy; at the bottom of the arc, it is pure kinetic energy e. kinetic, potential, and chemical energy. The child powers the swing with chemical energy in the muscle cells and the swing moves like a pendulum with changing ratios of kinetic and potential energy.
Pigs have feet with toes that do not touch the ground. These are examples of
a. a vestigial structure b. something in the process of evolving c. homologous traits d. a deleterious mutation e. biological gradualism
By definition, how much salt does fresh water contain?
A) less than 0.0001% B) less than 0.1% C) about 1% D) absolutely none
An inducible operon is usually controlled by:
a. an inducer molecule that keeps it in the "off" state. b. an active repressor that keeps it in the "off" state. c. being active at all times. d. allolactose. e. being turned "off," usually by the end product of the pathway