Which element is LEAST likely to be an abiotic factor that can affect community structure?
a. sunlight
b. rainfall
c. cloud cover
d. decomposing organic matter
e. temperature
ANSWER: d
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If you were reading off the sequence of amino acids in the figure to a biologist friend, what should the first three letters be?
A) M-N-G B) A-P-A C) It does not matter, since the protein has no polarity or directionality.
The complex of periplasmic flagella that mediates the movement of spirochetes is referred to as the ________.
A. axillary filament B. periplasmic flagella C. axial filament D. peritrichal axon E. periplasmic flagella or axial filament
What is the ultimate fate of the atoms in oxygen gas (O2) in cellular respiration?
a. They are respired as CO2. b. They are incorporated to water. c. They are attached to glucose. d. They are attached to pyruvate. e. They accepts electrons in glycolysis.
Which of the following mechanisms is most likely related to retinoblastoma?
A. Persistent activation of the Ras gene B. Increased production of epidermal growth factor C. Decreased susceptibility to apoptosis D. Impaired functioning of mismatch repair genes E. Inactivation of the Rb gene