The dark middle layer of the eye that prevents the scattering of light within the eyeball is the ____.
A. fovea
B. retina
C. sclera
D. choroid
E. cornea
Answer: D
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The lowest level of biological organization that can survive and reproduce is the ____
a. cell b. tissue c. proton
d. nucleus e. DNA
The activities by which cells acquire and process energy are collectively called:
a. organic chemistry b. biochemistry c. condensation d. hydrolysis e. metabolism
This diagram illustrates the action of a proteasome on protein marked with ubiquitin tags. What statement about this process is true?
a. Degradation of proteins results in the destruction of the proteasome.
b. Degradation of proteins in proteasomes produces a net output of energy.
c. Degradation of proteins in proteasomes requires a net input of energy.
d. Proteasomes absorb all non-amino acid components of proteins.
Exotoxins belong to a class of biological molecules called:
A. mucopolysaccharides B. lipopolysaccharides C. nucleic acids D. proteins E. peptidoglycans