Botulinum toxin causes flaccid paralysis of the muscles, and is used for cosmetic purposes under the name botox. which of the following is the most likely mechanism of action of botox?
botox decreases the production of acetylcholinesterase.
botox increases calcium release from the sarcoplasmic reticulum.
botox blocks the atp binding site in actin.
botox decreases the release of acetylcholine from motor neurons.

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u.s. and mexico. the st. lawrence seaway provides an important trading route for the u.s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.

Each nephron is made up of capillaries that form the __ sweat glands bladder glomerulus ureter