In an atom, the number of neutrons determines most specifically the ________
A) element
B) isotope
C) ion state
D) chemical properties
B
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Which of the following statements is true about enzyme-catalyzed reactions?
A) The reaction is faster than the same reaction in the absence of the enzyme. B) The free energy change of the reaction is opposite from the reaction that occurs in the absence of the enzyme. C) An enzyme catalyzes a reaction by raising the activation energy. D) Enzyme-catalyzed reactions require energy to activate the enzyme. E) Enzyme-catalyzed reactions release more free energy than noncatalyzed reactions.
A mechanism of gene regulation that controls the amount of mRNA available for translation is called ____________________
Fill in the blank(s) with correct word
All of the following reasons—except one—explain why so many sperm are ejaculated when only one
is needed for fertilization. Which is the incorrect reason? a. Many sperm die by phagocytosis in the female tract. b. Many sperm swim up the wrong oviduct. c. The enzymes from many acrosomes are needed to penetrate the corona radiata. d. Many male pronuclei must be present in order to fuse with each female pronucleus. e. Many sperm die as a result of the unfavorable pH in the vagina.
A primary source of carbon for photosynthetic organisms is:
a. carbon dioxide in the atmosphere and water. b. bicarbonate in the water. c. nitrate in the soil. d. dissolved phosphate in water. e. carbonic acid in rain.