Which of the following is not a char of all living organisms?
a. response to stimuli
b. adaptation
c. sexual reproduction
d. regulation of internal environment
e. acquisition of energy
Answer: c. sexual reproduction
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An IPSP occurs when:
A. ligand-gated chloride channels open. B. ligand-gated calcium channels open. C. voltage-gated chloride channels open. D. both ligand- and voltage-gated chloride channels open.
If the DNA nucleotides read ATG-CGT-GAC, the amino acid sequence of the resulting polypeptide would be
a. tyrosine - alanine - leucine. b. methionine - arginine - asparagine. c. histidine - glycine - proline. d. serine - lysine - glycine. e. serine - lysine - isoleucine.
Which of the following can act as opsonins on bacteria, thus enhancing phagocytosis?
What will be an ideal response?
The tertiary structure of proteins is typified by the:a
association of several polypeptide chains by weak bonds. b. order in which amino acids are joined in a peptide chain. c. bonding of two amino acids to form a dipeptide. d. folding of a peptide chain to form an alpha helix. e. three-dimensional shape of an individual polypeptide chain