Which one of the following statements about amino acids is incorrect?
A. A turn or kink in a protein is more likely to be induced by a proline than by a glycine.
B. The bridge between cysteines that connects parts of a protein is a stable, but non-covalent interaction.
C. At typical cellular pH, the side chains of basic amino acids are positively charged.
D. Not every amino acid is asymmetric.
E. The more glycines that are found in a polypeptide's primary sequence, the more flexible the backbone of that polypeptide.
Answer: B
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Consider two islands located an equal distance from the mainland (colonization source). One island is large, the other is small. Which island will have a higher rate of change in species composition?
A. the small island B. the large island C. The rate of change in species composition will be the same on both islands. D. Species composition does not change at equilibrium.
The antiparallel arrangement within DNA molecules refers to
A. a purine always bonding to a pyrimidine. B. each base bonding at the 1' position of the sugar. C. one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction. D. an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.
Which of the following is an enzyme that breaks hydrogen bonds?
a. helicase b. telomerase c. DNA polymerase d. DNA ligase
In the human male and female reproductive systems, each system contains paired primary sex organs called _____, which contain _____ cells that give rise to gametes.
A. testes; sperm B. gonads; germ C. ovaries; egg D. bulbourethral glands; germ E. All of the answer choices are correct.