The exchange of a purine-pyrimidine base pair for the other purine-pyrimidine pair is:
A. a silent mutation.
B. a transition mutation.
C. a frameshift mutation.
D. a nonsense mutation.
E. a transversion mutation.
B
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At high tide a coastal plant or animal cell will be in
Estuaries are locations where rivers flow into oceans, with tidal shifts changing the salt concentrations. Plants and animals that live in estuaries face a dilemma in maintaining water balance inside their cells. During high tide they are in salt water, while at low tide they are in fresh water. A. osmosis. B. an isotonic solution. C. a hypotonic solution. D. a hypertonic solution. E. equilibrium.
Glycolysis is a metabolic process that is conducted by nearly all cells. However, in addition to glycolysis, some cells also make use of another metabolic process called the Krebs cycle. What does this tell you about the evolution of these processes?
A. Both the Krebs cycle and glycolysis likely evolved at the same time B. As a metabolic process, glycolysis likely evolved prior to the Krebs cycle C. As a metabolic process, the Krebs cycle likely evolved prior to glycolysis
What is the definition of a ribozyme?
a. a compound responsible for absorption of the sun's UV light b. a protective vesicle or enclosure for various molecules c. tRNA associated with an amino acid d. a molecule in early life-forms responsible for maintenance of cellular information e. a catalytic RNA molecule
These are obligate intracellular parasites that lack mitochondria.
a. Apicomplexa b. ciliates c. dinoflagellates d. Microsporidia