Which characteristic trait is virtually exclusive to humans?
a. ability to think
b. ability to reproduce
c. ability to use tools
d. great manual dexterity
e. ability to communicate
D
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Sterol regulatory element binding proteins (SREBPs) are involved in regulating the synthesis of ____
a. proteins b. lipids c. nucleic acids d. carbohydrates e. amino acids
Selective serotonin reuptake inhibitors treat depression by
A) inhibiting the production of serotonin. B) preventing postsynaptic neurons from releasing serotonin into the synapse. C) preventing presynaptic neurons from taking up serotonin from the synapse. D) releasing endomorphins in the plasma membranes of the postsynaptic neurons.
Which statement best describes a DNA mutation?
a. DNA polymerase adds an incorrect base during replication. b. DNA is damaged by UV irradiation. c. A mistake in DNA sequence is repaired during replication. d. A permanent change occurs in the nucleotide sequence of DNA. e. Proofreading during replication replaces a mismatched nucleotide.
Most changes to the universal genetic code
a. require corresponding mutations in rRNAs. b. are to allow encoding of more than twenty amino acids. c. occur in nuclear genomes. d. occur in yeast species. e. affect termination codons if in the nuclear genome.