The source of diversity for B and T cell receptors is
a. mitosis.
b. meiosis.
c. transcript processing.
d. random recombination of genes.
e. gene transcription.
Answer: d
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Which one of the following interactions is not a stabilizing force at the tertiary level of protein organization?
A. an ionic bond between a positively charged side chain and a negatively charged side chain B. hydrophobic clustering of non-polar side chains in the interior of a protein C. hydrogen bonding between a carbonyl oxygen of one peptide bond and an amide hydrogen of a nearby peptide bond D. disulfide linkages between cysteine residues E. van der Waals interactions between side chains in close proximity
At a neuromuscular junction, the neurotransmitter released by the motor neuron is ________
a. epinephrine b. acetylcholine (ACh) c. serotonin d. dopamine
Hydrogenation is a chemical process that
a. turns liquid oil to solid fats. b. turns amino acids into proteins. c. turns DNA into lipids. d. creates stable alternative energy sources. e. does none of these
A plant appears green because
A. its chloroplasts use green wavelengths of light. B. chlorophyll a absorbs red and blue light. C. chlorophyll a absorbs ultraviolet light. D. Both a and c are correct.