Cells make use of H+ electrochemical gradients in many ways. Which of the following proton transporters is used to regulate pH in animal cells?
(a) light-driven pump
(b) H+ ATPase
(c) H+ symporter
(d) Na+-H+ exchanger
(d) The high extracellular concentration of Na+ is employed by a transporter that pumps protons out of animal cells as Na+ is brought into the cell. The other transporters are found only in bacterial cells.
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As DNA polymerase synthesizes a new DNA strand, it can ____
a. detect an incorrect nucleotide b. not detect an incorrect nucleotide c. induce apoptosis when it detects a mistake in DNA synthesis d. induce senescence when it detects a mistake in DNA synthesis e. immediately stop the cell cycle
Does the empirical formula for carbohydrates convey any structural information?
a. It may convey structural information for ringed carbohydrates. b. No. c. It may convey structural information for branching chained carbohydrates. d. None of the above.
If the apple and haw flies no longer interbreed due to the different ripening times of apples and hawthorns, this would be an example of what kind of reproductive isolating mechanism?
A) temporal isolation B) ecological isolation C) gametic isolation D) mechanical isolation E) behavioral isolation
In the practice of variolation, how were patients exposed to the smallpox pathogen?
A) Babies were nursed by women who had already had smallpox. B) They were exposed to bedding or clothes of a person with smallpox. C) They were exposed to a bovine version of the disease, which is mild in humans. D) They were exposed to dried scabs from smallpox lesions. E) They were placed in a room with a person who currently had smallpox.