The ? helix and ? pleated sheet represent which level of protein structure?
A. primary structure
B. secondary structure
C. tertiary structure
D. quaternary structure
E. pentiary structure
Ans: B. secondary structure
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Indicate whether the statement is true or false.Because whales breathe via lungs, have a little hair when born, and nurse their young, these
__________ characters allow us to classify them as mammals. a. plesiomorphic b. homoplastic c. cladistic d. polyphyletic e. derived
If the quantities of the four bases in a DNA molecule are measured, we find that
A) T = A and C = G. B) A = G and C = T. C) A = C and G = T. D) no two bases are equal in amount. E) all bases are equal in amount.
A scientist wants to perform a test that will indicate whether a nucleic acid sample is composed of RNA or DNA. Testing for the presence of which of the following is most appropriate in this situation?
A) phosphate B) nitrogen C) guanine D) uracil E) thymine