Membrane synthesis in the cell requires the regulation of growth for both halves of the bilayer and the selective retention of certain types of lipids on one side or the other. Which group of enzymes accomplishes both of these tasks?
(a) flippases
(b) phospholipases
(c) convertases
(d) glycosylases
(a)
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A motor unit is
a. a single muscle fiber activated by one neuron. b. the complete set of muscle fibers in a single muscle. c. a single sarcomere. d. a single muscle fiber activated by many neurons. e. a group of muscle fibers activated by one neuron.
How is natural selection related to sexual reproduction as opposed to asexual reproduction?
A) Sexual reproduction results in many new gene combinations, some of which will lead to differential reproduction. B) Sexual reproduction results in the greatest number of new mutations. C) Sexual reproduction allows the greatest number of offspring to be produced. D) Sexual reproduction utilizes far less energy than asexual reproduction.
A difference between an acid and a base is that
A. acids are harmful and bases are not. B. acids release hydroxide ions and bases release hydrogen ions. C. acids have a high pH value and bases have a low pH value. D. acids have a low pH value and bases have a high pH value.
Some chytrids parasitize protists.
Answer the following statement true (T) or false (F)