Disulfide bonds within or between proteins form easily in which of the following?
a. Both cytosol and ER
b. Neither cytosol nor ER
c. Cytosol but not ER
d. ER but not cytosol
Ans: d. ER but not cytosol
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________ is / are able to degrade infecting bacteriophage DNA, thus protecting the host cell.
A. Protection exonucleases B. Restriction endonucleases C. Modification methylases D. Lysozyme
Oxygen is able to allow electrons of a very low energy level to combine with it at the end of cellular
respiration and ultimately make water. How are the specific properties of oxygen beneficial to the organism that uses it as a final electron acceptor?
a. Oxygen is highly reactive and readily accepts electrons. b. Oxygen is strongly electronegative and helps pull the electrons through the electron transport chain. c. Oxygen allows a maximum output of energy from ATP synthesis. d. Oxygen is the only molecule that can act as a final electron acceptor. e. Oxygen is highly reactive and readily oxidizes methane.
Which functional group forms bridges to help stabilize a protein’s quaternary structure?
a. amino b. carbonyl c. hydroxyl d. phosphate e. sulfhydryl
The exchange of gases across a respiratory surface always occurs by
A. facilitated transport. B. diffusion. C. active transport. D. bulk flow. E. osmosis.