Ligand-gated ion channels play important roles in relaying information between neurons at synapses. An outline of the structure of a synapse is shown in this diagram. Which of the following statements most accurately describes ligand-gated ion channels found at synapses?

A) The neurotransmitter ligand binds and opens the channel, and then the ligand-gated ion channel directly regulates ion flow into the cell receiving the neurotransmitters.
B) The neurotransmitter ligand binds and opens the channel, and then the ligand-gated ion channel directly regulates ion flow into the cell releasing the neurotransmitters.
C) The neurotransmitter ligand binds and either opens or closes the channel, and then the ligand-gated ion channel directly regulates ion flow into the cell releasing the neurotransmitters.
D) The neurotransmitter ligand binds and either opens or closes the channel, and then the ligand-gated ion channel directly regulates ion flow into the cell receiving the neurotransmitters.

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

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits

The graph shows the amount of global warming happening in different ecosystems. which populations of organisms will likely decline the most as a result of climate change, and why? a. coral reefs because of the loss of the symbiotic algae living within their bodies b. penguin populations because the fish they eat will move into warmer waters c. mountain-dwelling birds because rising sea levels will relocate their food sources d. large cats in the rainforest because of decreased habitat loss for their prey