What neurotransmitter is released at neuromuscular junctions in vertebrates?
A. acetylcholine
B. serotonin
C. epinephrine
D. GABA
E. endorphins
A. acetylcholine
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A ribonucleoprotein is:
A. an enzyme that degrades RNA. B. an RNase that functions in the nucleus. C. a nucleotide-transport protein. D. a noncoding RNA complexed with protein.
The routing of proteins to their final destinations in eukaryotic cells is ____
a. essentially random b. based on transcription factors c. controlled by the type of ribosome used d. directed by signals that are part of the proteins e. primarily determined by mRNA splicing
A pea plant that is not able to make GA1 will ____
a. grow away from light
b. not be able to make flowers c. be a dwarf d. not be able to make fruits e. have nearly no root growth
What happens when thyroid hormone binds to cells of brown adipose tissue?
a. mitochondria of brown adipose tissue cells carry out reactions that produce heat b. a shivering response for heat production by skeletal muscle c. the body stores more energy as fat d. a decrease in metabolic rate