Sandra was 74 years old. She often complained being fatigue, having muscle cramps, difficulty swallowing, and needing machines to help her breath. During reflex tests, she also showed absents of some reflexes. Both her presynaptic and postsynaptic neurons were low in numbers. Her postsynaptic neurons were lower than presynaptic neurons. With further investigation, it was revealed that she was exposed to a chemical that increases intracellular protein production in the nerves. This unknown chemical could also increase release of excessive excitatory neurotransmitters which could cause death in postsynaptic neurons. Knowing that rise in massive amount of Ca 2 in cytoplasm of postsynaptic neuron could kill the nerve, propose two mechanisms that may be involved in Ca2 entry to the postsynaptic neurons after the release of the neurotransmitters in the synaptic cleft: (Hint: need to show how Ca 2 enters the neurons)

Astudent from one of the research labs is having trouble preparing a slide for examination and photographing. the bacterial slide that he has brought to you was prepared using a commercially purchased stain. he has asked for your in determining what he is doing wrong so that he can change the lab protocols and continue on with his project. after examining the slide under oil immersion, you determine that no bacteria are present even though the student is able to show you the culture he used to make that slide that has visible growth in the liquid medium. which of the following statements does not explain the fact that there are no bacteria present on the student’s slide? by not allowing a glass slide to completely air dry before heat fixation, the flame will cause the surrounding water to boil and this will damage the bacterial cell. overheating during the fixation step boiled the water within the bacterial cells and resulted in the cells bursting. insufficient heating of the slide did not drive out the thin layer of water and this resulted in minimal bonding between the bacteria and the glass slide. rinsing with alcohol during the washing step stripped the bacteria off the glass slide. rinsing with alcohol during the washing step stripped the bacteria off the glass slide.