DNA gyrase
A. closes gaps between DNA bases.
B. removes supercoiling ahead of origin.
C. synthesizes RNA primers.
D. copies DNA bases.
Answer: B
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In plants, meiosis results in
a. haploid spores. b. haploid gametes. c. diploid spores. d. diploid gametes. e. more than one of these
A plant lacking this macronutrient is likely to be deficient in which step of root nodule development?
A. phosphorus; development of infection threads B. phosphorus; curling of root hairs around rhizobia C. calcium; flavonoid release D. calcium; curling of root hairs around rhizobia
Which substances are reabsorbed in the proximal convoluted tubule?
A. K+ ions B. Na+ ions C. HCO3- ions D. glucose E. All of the choices for this question are correct.
The phospholipid molecules of most membranes
have a. a hydrophobic head and a hydrophilic tail. b. a hydrophobic head and a hydrophobic tail. c. a hydrophobic head and two hydrophobic tails. d. a hydrophilic head and two hydrophobic tails. e. none of these.