Cerebrospinal fluid occupies the space between the:a
dura mater and skull.
b. dura mater and pia mater.
c. arachnoid and pia mater.
d. pia mater and brain.
e. dura mater and arachnoid.
c
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Which statement is true?
a. Retroviruses hijack existing reverse-transcription processes in cell to reproduce. b. Retroviruses activate vestigial genes in host cells to facilitate viral reproduction. c. Retrovirus genomes are encoded in RNA and must be converted to DNA in the cell. d. Retroviruses only become symptomatic within the offspring of infected host organisms.
Which one of the following molecules would MOST likely require a transport protein to cross the plasma membrane of a red blood cell?
a. H2O b. CO2 c. O2 d. C6H12O6
The outer mitochondrial membrane contains
a. a lower concentration of proteins than the inner membrane. b. an active transporter for pyruvate. c. proton transporters. d. an active transporter for ATP
What controls the shape of the lens?
A. pupil B. iris C. fovea centralis D. ciliary muscle E. cornea