Why are enzymes considered important biological catalysts?
a. Enzymes lower the entropy of a biochemical reaction.
b. Enzymes decrease the enthalpy of a biochemical reaction.
c. Enzymes increase the free energy of a biochemical reaction.
d. Enzymes supply the energy to initiate a biochemical reaction.
e. Enzymes lower the activation energy of a biochemical reaction.
e
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The breakdown of large molecules by enzymes and the addition of water is known as a ____ reaction
a. oxidation b. reduction c. condensation d. hydrolysis e. decarboxylation
Which statement about the geologic time scale
is incorrect? a. Mammals originated early in the Mesozoic era. b. Adaptive radiation of flowering plants, insects, and birds took place during the Mesozoic era. c. Mass extinction of the dinosaurs occurred about 65 million years ago. d. Reptiles originated during the Paleozoic era. e. Eukaryotes originated during the Proterozoic eon.
Movement of molecules from an area of high to low concentration with the help of membrane proteins is:
A. simple diffusion B. signal transduction C. facilitated diffusion D. group translocation
In __________ speciation, a geographic barrier interrupts gene flow between populations.
Fill in the blank(s) with the appropriate word(s).