Describe how siRNA functions in regulation of expression and how this can be used as a tool in genetic research
What will be an ideal response?
"Small interfering" RNA can complex with mRNA with complementary base sequences, preventing transcription. This makes siRNAs valuable tools, as they can be synthesized to experimentally block the expression of genes in specific tissue types with very precise timing, helping geneticists determine gene function and interaction.
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________ refers to the removal of an amino group from an amino acid. One mechanism for this removal is ________, in which the amino group is transferred to an acceptor molecule.
A. Deamination; transamination B. Deamination; hydrolysis C. Transamination; deamination D. Hydrolysis; transamination
Neuropeptide neurotransmitters ____
a. can act as direct neurotransmitters between neurons and muscle cells b. can act as postsynaptic membrane inhibitors c. directly open K+ channels to inhibit neurons d. can act as pain reducers and initiate euphoria e. directly inhibit euphoria
Contraction of the diaphragm causes
A. a person to exhale. B. the size of the chest cavity to increase. C. air to flow from the lungs to the outside. D. compression of the lungs.
The two-stage life cycle in plants evolved as an adaptation to life on land.
a. true b. false