Which of the following can be used to isolate pure cultures of bacteria from mixtures?
A. Streak plates
B. Pour plates
C. Spread plates
D. All of the choices are correct.
Answer: D
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Pseudopeptidoglycan (pseudomurein) is part of the cell wall of some methanogens
Indicate whether the statement is true or false.
Which of the following would increase the rate of oxygen diffusion from the air into the body cells of a flatworm?
A. increasing the surface area of the body B. increasing the partial pressure of oxygen inside of the cells C. increasing the thickness of the body wall D. increasing the surface area of the body and the partial pressure of oxygen inside the cells E. All of the answer options are correct.
Tanisha and Tawanda are twins but do not look alike. They are the result of fertilization of
A) one oocyte by two sperm cells. B) two oocytes by one sperm cell. C) two oocytes by two sperm cells. D) one oogonium by one spermatogonium.
Select the incorrect statement about muscle and muscle fibers.
A. Long distance runners tend to have more slow-twitch muscle fibers than fast-twitch fibers. B. A quick contraction and relaxation of an isolated skeletal muscle is called tetanus. C. Fast-twitch fibers have fewer capillaries and mitochondria than slow-twitch fibers. D. Slow-twitch muscle fibers have high concentrations of myoglobin. E. Fast-twitch fibers increase in size with resistance training.