At the neuromuscular junction:

A. To terminate contraction, acetylcholine is broken down by acetylcholinesterase at the muscle cell membrane. B. Opening of muscarinic acetylcholine receptors increases the sodium permeability of the skeletal muscle membrane. C. Action potential propagation to the lower motor neuron triggers the opening of voltage gated Ca2+ channels allowing Ca2+ to flow into the cell and bind to muscle proteins triggering contraction. D. Action potential propagation to the lower motor neuron terminal opens voltage-gated Ca2+ channels triggering exocytosis of vesicles containing glutamate. E. Acetylcholine binding to acetylcholinesterase results in muscle contraction.

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

Differentiation of cells changes the nucleic information. true false

The cluster of developing cells from conception until birth is called an