The neurotransmitter acetylcholine, released by a neuron at a neuromuscular junction binds to nicotinic acetylcholine receptors on the cell membrane of the skeletal muscle cell these receptors are ligand-gated ion channels that allow both na and 'to flow across the membrane when engaged with a ligand. notably, only one of the two ions crosses the membrane at appreciable rates when acetylcholine first binds to the receptor. which ion is it, and how do you know this? (use information from part a of this problem to support your answer.)

You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip.nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule.true/false

Moving down the ramp from 6 meters to

Which statement best addresses the differences in sex cell differentiation between the red-eared slider turtle and a human?