The ultimate electron acceptor in aerobic respiration is
a. NAD+.
b. CO2.
c. ADP.
d. NADP+.
e. O2.
E
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Many closely related duck species exhibit ____, the dramatic variation in the appearance of males but not females,
which is an almost certain sign of ____.
a. asexual reproduction; sexual selection b. asexual reproduction; artificial selection c. sexual dimorphism; sexual selection d. sexual dimorphism; artificial selection e. sexual uniformitarianism; sexual selection
Many signal transduction pathways utilize second messengers to ____
a. transport a signal through the lipid bilayer of the plasma membrane b. relay a signal from the outside of the cell to the inside c. relay a signal from the inside of a cell membrane to the outside of the cell d. decrease the message once the signal molecules have left the receptor e. relay the message from the inner surface of the plasma membrane throughout the cytoplasm
All of the following are reverse transcriptase inhibitors used to treat HIV infection EXCEPT ________.
A. azidothymidine B. lamivudine C. zalcitabine D. didanosine E. acyclovir
Transmutation of an element (the change of an element into a different element) occurs due to
a. exposure to strong sunlight. b. exposure to certain chemicals. c. natural aging of the element. d. combining with another element. e. radioactive decay.