Which metabolic process is most closely associated with intracellular membranes?
A) substrate-level phosphorylation
B) oxidative phosphorylation
C) glycolysis
D) the citric acid cycle
E) alcohol fermentation
Ans: B) oxidative phosphorylation
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Use the principle of parsimony and molecular genetic data to choose a phylogenetic tree for your hypothesis of how the extant species were derived from the ancestor.
A. Tree 1 requires the most mutations, making it the best choice.
B. Tree 1 requires the fewest mutations, making it the best choice.
C. Tree 2 requires the most mutations, making it the best choice.
D. Tree 2 requires the fewest mutations, making it the best choice.
E. Both trees are equally good because sequences A, B, C, and D are the same in both.
The first cells appeared on Earth about __________
years after its crust solidified. a. 1 billion b. 200 million c. 3.8 billion d. 4.5 billion e. a few
Deamination is a process that removes:a
the amino group from amino acids. b. the amino group from nucleic acids. c. amines from the bloodstream. d. amines from nucleic acids. e. ammonia from blood.
Which of the following statements about plant viruses is false?
A) Once in a plant, a virus can spread from cell to cell through plasmodesmata. B) The genetic material in most plant viruses is RNA. C) Preventing infections and breeding resistant plants can control viral infection in plants. D) There are many successful ways to rid infected plants of a virus.