The inner membrane of mitochondria folds back on itself to form
a. plastids.
b. cristae.
c. centrioles.
d. nucleoli.
e. microfilaments.
B
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Which is the dominant greenhouse gas leading to global warming of the atmosphere?
A. CO2 B. CH4 C. H2O D. NO2
An example of one of the ways a pH buffer helps to maintain homeostasis is to
A. increase the H+ concentration if pH decreases. B. reduce the H+ concentration if pH decreases. C. reduce the H+ concentration if pH increases. D. increase the OH- concentration if pH increases. E. reduce the OH- concentration if pH decreases.
The number of different proteins a cell can produce is often much larger than the number of genes in
that cell. Indicate whether the statement is true or false.
Alveoli
A) are blind sacs that extend from tracheae. B) are found in gills. C) are thick-walled. D) are not permeable to dissolved oxygen. E) have a moist surface.