A cell type that secretes skeletal support elements
and digests and transports food is indicated by
a. A.
b. B.
c. C.
d. D.
e. E.
Answer: d
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In green plants, which photosystem absorbs photons to excite electrons in the reaction center?
A. Photosystem I B. Photosystem II C. Photosystem III D. Photosystem I and II E. Photosystem I, II and III
Secondary structures are stabilized by which type of interaction?
A. hydrophobic clustering B. disulfide linkages C. ionic bonding D. hydrogen bonding E. van der Waals forces
The organisms isolated from hydrothermal vents are typically
A. phototrophs. B. chemolithoautotrophs. C. rhizobia. D. bacteroid. E. phototrophs, rhizobia AND bacteroid.
As the human body grows to trillions of cells, DNA replication occurs about how many times?
A) one billion. B) three trillion. C) 100 trillion. D) 100 quadrillion.