Which of the following provides evidence for the signal hypothesis for the targeting of a secretory protein to the rough ER?
a. The protein is larger when synthesized in vitro on free polysomes.
b. The secretory protein ends up in the cytosol when a short sequence is deleted by genetic engineering.
c. A normally cytosolic protein is secreted when a specific sequence is added to it by genetic engineering.
d. All of the above
Ans: d. All of the above
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Methanogens can live only in ________ environments.
A. anaerobic B. microaerophilic C. aerobic D. All of the choices are correct.
Why are enzymes considered important biological catalysts?
a. Enzymes lower the entropy of a biochemical reaction. b. Enzymes decrease the enthalpy of a biochemical reaction. c. Enzymes increase the free energy of a biochemical reaction. d. Enzymes supply the energy to initiate a biochemical reaction. e. Enzymes lower the activation energy of a biochemical reaction.
To produce organic matter from inorganic matter, energy is needed. Miller's experiment provided two sources of energy. They were
A. ultraviolet light and heat. B. heat and electric sparks. C. electric sparks and ultraviolet light. D. None of these answers is correct.
The primary role of _____ is to bind animal cells together.
-gap (communicating) junctions -desmosomes -plasmodesmata -the cytoskeleton -tight junctions