The reaction ATP + H2O ? ADP + Pi is classified as an:
a. endergonic reaction.
b. enthalpy reaction.
c. entropy reaction.
d. exergonic reaction.
e. intermediate phosphorylation reaction.
D
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Which of the following statements regarding transcription only apply to eukaryotes and not to prokaryotes?
A. A single RNA polymerase transcribes genes that encode mRNAs, tRNAs, and rRNA. B. Sigma (?) subunit detaches from RNA polymerase shortly after transcription has initiated. C. The C-terminal domain of the polymerase is phosphorylated after transcription has initiated. D. RNA synthesis is inhibited by actinomycin D. E. RNA synthesis is inhibited by rifampicin.
When an action potential is initiated, ________ flow ________ the cytoplasm of the axon
a. negative potassium ions / into b. positive sodium ions / into c. negative sodium ions / out of d. positive sodium ions / out of
The probability that an individual who inherits an allele will have the phenotype associated with it is
a. pleiotropy. b. genomic imprinting. c. codominance. d. penetrance. e. linkage.
Because a steroid hormone is nonpolar, it ____.
A. must be transported across a cell membrane with a receptor molecule B. is equipped with specific receptor molecules C. can dissolve in blood D. can diffuse directly across a cell membrane E. is an inhibiting hormone