Until the mid-1940s, many scientists considered proteins to be the likely candidates for the genetic material. Which of the following characteristics led scientist to believe DNA was NOT the genetic material?
A) DNA is less abundant than protein.
B) DNA is less abundant than protein and DNA has less variation than protein.
C) DNA is more stable than protein.
D) DNA has less variation than protein.
E) Protein can fold into may shapes.
Answer: B
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Enzyme 1 converts substrate A into product B. Is this an example of a metabolic pathway?
A. Yes. This is a metabolic pathway that includes feedback inhibition. B. No. This only describes one chemical reaction. A metabolic pathway includes multiple chemical reactions. C. Yes. This is a simple metabolic pathway. D. No. A metabolic pathway must include an inhibitory step.
All vertebrates contain a similar pattern of organs, indicating that they are related to one another. This represents which of the following lines of evolutionary evidence?
A. fossil record B. homology C. convergent evolution D. biogeography E. development
Consider a population of size Ne in which a new mutation that confers a fitness ad-vantage of 1+s. This new allele will be more likely to go to fixation due to selection if:
a. Ne is large. b. Ne is small. c. s is small. d. s is large. e. A and D.
Which of the following monomer building blocks is necessary to assemble selectively permeable boundaries around and inside cells?
(a) sugars (b) fatty acids (c) amino acids (d) nucleotides