The primary neurotransmitter at neuromuscular junctions in skeletal muscle is _________.
A. glutamate
B. acetylcholine
C. norepinephrine
D. GABA
Answer: B. acetylcholine
You might also like to view...
In which of the following molecules are the electrons shared in covalent bonds at the furthest distance from the nucleus?
A. glucose B. water C. carbon dioxide
The Cerulean warbler is a songbird that breeds in the eastern and middle US and winters in Central America. Its numbers have been rapidly declining over the past 50 years. You are interested in the reason(s) for this rapid decline and set about to make observations and gather data. The graph above shows data you collected on the abundance of Brown cowbirds (nest parasites) and Cerulean warblers at various locations. Based on a visual inspection of the graph, what can you conclude?
A. Brown cowbirds are responsible for the decline of the Cerulean warbler.
B. The abundance of Brown cowbirds shows a negative relationship with Cerulean warbler abundance.
C. Brown cowbird abundance is significantly correlated with Cerulean warbler abundance.
D. The abundance of Brown cowbirds shows a positive relationship with Cerulean warbler abundance.
E. Brown cowbirds do not appear to affect Cerulean warblers.
An embryo with no SRY gene develops into a
__________. Fill in the blank(s) with the appropriate word(s).
A cDNA library
A) is generated by copying genomic DNA with the polymerase chain reaction and cloning the resulting complementary DNA (cDNA). B) is generated by copying messenger RNA (mRNA) with the enzyme reverse transcriptase and cloning the resulting complementary DNA (cDNA). C) corresponds to the protein complement of a cell. D) doesn't contain introns. E) doesn't contain introns because it is generated by copying messenger RNA (mRNA) with the enzyme reverse transcriptase and cloning the resulting complementary DNA (cDNA).