A person may have a muscle injury that really affects the tendon and not the muscle tissue itself. Why is it that after a hard workout, muscle pain will go away in a few days at most, but tendinitis lasts so much longer?
A) Muscle cells are more elastic, so they are harder to damage.
B) Unlike a tendon, muscle tissue has an ample blood supply, so it's easier to repair.
C) Muscle cells can be rested, but tendons have to be used all the time.
D) The electrical signals that muscle cells generate are used to aid in healing.
B
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The constituents of the electron transport chain have similar capabilities, with the exception of ubiquinone (coenzyme Q). What is different about ubiquinone?
A) Ubiquinone is a protein that begins the electron transport chain, so it accepts the highest-energy electrons. B) Ubiquinone is a protein that serves as a regulator of the rate of redox reactions in the electron transport chain. C) Ubiquinone is a protein that is a constituent of all cells, prokaryotic or eukaryotic; hence its name, originating from "ubiquitous." D) Ubiquinone is not a protein, is lipid soluble, and can move through the inner mitochondrial membrane.
Lipid rafts have been associated with which of the following?
A) responses to extracellular signals B) transport of nutrients across cell membranes C) immune responses D) transport of cholera toxin into cells E) all of the above
Organogenesis
A. Arises from germ layer cells. B. involves failure of the organs to form. C. is when tadpoles become frogs. D. is the formation of the three germ layers. E. involves acrosomal reaction.
Which statement best describes a typical food chain?
a. An owl has a positive impact on the grass population. b. An owl has a negative impact on the grass population. c. A carnivore has a negative effect on primary producers. d. Energy can flow back and forth between trophic levels. e. Energy is never lost as it moves from one trophic level to the next.