What is the name of the neurotransmitter used at a skeletal neuromuscular junction?
A. Norepinephrine
B. Calmodulin
C. Acetylcholinesterase
D. Acetylcholine
Answer: D. Acetylcholine
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Animals that use a radula to scrape up algae are _____
a. gastropods b. bivalves c. annelids d. roundworms e. leeches
Which of the following statements about a complete digestive system is false?
a. It is characteristic of flatworms. b. It is a tube with two openings. c. Its regions are specialized to perform specific functions. d. Food can be ingested while previously eaten food is being digested. e. Food enters the mouth and is eliminated through the anus
Plasmodesmata are most similar to
a. gap junctions in animal cells. b. tight junctions in bacteria. c. basement membranes in animal cells. d. adhering junctions in heart muscle. e. both tight junctions in bacteria and adhering junctions in heart muscle
A cell that completed the cell cycle without undergoing cytokinesis would ________
A) have less genetic material than it started with B) not have completed anaphase C) have its chromosomes lined up in the middle of the cell D) have two nuclei