On the basis of the principle of complementary base pairing, you would expect the percentage of _____ to be equal to the percentage of _____.
a. adenine ... thymine
b. adenine ... guanine
c. thymine ... guanine
d. adenine ... cytosine
e. thymine ... cytosine
Ans: a. adenine ... thymine
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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
A digestive system involving a tube-within-a-tube is characteristic of Cnidarians
____________________ Indicate whether the statement is true or false.
Thymine and cytosine differ from adenine and guanine in that ________
A) thymine and cytosine are single-ring structures, whereas adenine and guanine are double-ring structures B) thymine and cytosine are only found in DNA, whereas adenine and guanine are found in both DNA and RNA C) thymine and cytosine are only found in DNA, whereas adenine and guanine are only found in RNA D) thymine and cytosine are larger nitrogenous bases
What is an array of organisms and their physical environment, all interacting through a one-way flow of energy and a cycling of nutrients?
A. Ecosystem B. Food web C. Biomass pyramid D. Biogeochemical cycle E. Food chain