The first enzyme in glycolysis is hexokinase. What does it do?
a. Hexokinase facilitates diffusion of glucose through the cell membrane.
b. Hexokinase moves glucose into the mitochondria to initiate glycolysis.
c. Hexokinase catalyzes the phosphorylation of glucose to produce glucose-6-phosphate.
d. Hexokinase destabilizes fructose-1,6-biphosphate to prepare it for cleavage.
c. Hexokinase catalyzes the phosphorylation of glucose to produce glucose-6-phosphate.
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Halobacterium salinarum and certain other extreme halophiles carry out light-driven synthesis of ATP under what condition?
A) low oxygen concentrations B) low light C) high oxygen concentrations D) high carbon dioxide concentrations
Which of the following describes the single layer of tightly packed cells that cover the entire root?
A) xylem B) root hairs C) epidermis D) endodermis
Why must the life cycle of sexually reproducing species alternate between haploid and diploid stages?
A. Haploid cells cannot grow independently of diploid cells. B. Meiosis must occur at some point in the life cycle to prevent a doubling of chromosomes in each generation. C. Meiosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation. D. Mitosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation. E. The diploid stage allows for genetic recombination.
What is NOT a component of the translation machinery?
A. protein polymerase B. mRNA C. translation factors D. ribosomes E. tRNA