The sequence of membrane proteins of the electron transport chain includes three transport proteins and other electron transport proteins. As the electrons from the electron carrier molecules move through the proteins, work is done. The electron transport chain produces a(n) concentration gradient.
A. NADH
B. ATP
C. oxygen
D. proton
E. electron
D. proton
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Enzymes work by ______ the activation energy required for a reaction to occur.
a. raising b. lowering c. keeping constant d. Enzymes don’t affect the activation energy of a reaction.
Which of the following is NOT true regarding
coenzymes?
a. they are cofactors. b. ATP is an example of a coenzyme. c. NaCl is an example of a coenzyme. d. They are often modified in chemical reactions. e. They may carry electrons
____ are short sections of underground stem
encased by overlapping layers of thickened, modified leaves called scales. a. Stolons b. Rhizomes c. Bulbs d. Corms e. Tubers
The cellulase-excreting protist that can account for up to one-third of the biomass of a termite is a member of the genus ________.
A. Euglena B. Trichonympha C. Trichomonas D. Hexamida