Enzymes _____
A) increase the rate of a reaction by making the reaction more exergonic
B) increase the rate of a reaction by lowering the activation energy barrier
C) increase the rate of a reaction by reducing the rate of reverse reactions
D) change the equilibrium point of the reactions they catalyze
E) make the rate of a reaction independent of substrate concentrations
Answer: B
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Briefly describe how a phagocyte engulfs and ingests a pathogen
What will be an ideal response?
The electron transport chain is part of:
A. glycolysis. B. the citric acid cycle. C. oxidative phosphorylation. D. fermentation. E. acetyl-CoA synthesis.
The Earth’s shifts the angle of its axis
approximately every ___ years.
a. 4,000 b. 40,000 c. 400,000 d. 4,000,000 e. 4,000,000,000
Your roommate tells you that because she has no time to eat healthy foods, she is taking megadoses of vitamins. You warn her that this may be dangerous, because certain vitamins can accumulate in body fat
Megadoses of which of the following vitamins would be most likely to cause toxic effects? A) Vitamin C B) Vitamin E C) Folic acid D) Thiamin