Which of the following lists only essential trace elements?
a. zinc, iron, manganese, fluoride, molybdenum
b. boron, copper, iodine, selenium, manganese
c. copper, manganese, selenium, chromium, molybdenum
d. iron, zinc, magnesium, iodine, selenium
Ans: c. copper, manganese, selenium, chromium, molybdenum
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The major part of the angiosperm life cycle is the:
a. diploid gametophyte b. diploid sporophyte c. haploid gametophyte d. haploid sporophyte e. fertilization step
Thermus aquaticus was important in the
development of PCR in that it provided the necessary a. DNA polymerase. b reverse transcriptase. c. primers. d. DNA template. e. DNA ligase.
The proper positioning of bacterial chromosomes at the one-quarter and three-quarter positions prior to septum formation apparently is related to
a. chromosome condensation. b. a chemical gradient from the midpoint to the pole of the cell. c. recombination. d. a network of fibers that attach to the chromosomes and shorten, pulling them apart. e. growth of the bacterial cell wall at the midpoint.
Which of the following statements about the resting potential is true?
A) All of the listed responses are correct. B) The neuron's plasma membrane is much more permeable to sodium than to potassium. C) The concentration of sodium is much higher inside the cell than outside. D) Inside the cell, the concentration of potassium is much higher than the concentration of sodium. E) The chloride-hydrogen pump plays a role in maintaining the resting potential.