Why is immersion oil often used when viewing specimens under the microscope?

A substance with a pH of 3 is called _________.

If an excitatory neurotransmitter (ligand) like acetylcholine or glutamate is released onto the dendrites of a neuron, what will occur most often?   

The three basic groups of viruses based on morphology include

This person identified the cause of anthrax and tuberculosis.

How does an increase in end diastolic volume allow for the cardiac fibers to produce more force?

This person is known for producing the first ever vaccine, which was the smallpox vaccine.

Computer Communication networks problems are often categorized by their layer name. Match the 7 OSI layers below to their function

Which scientist discovered heat-resistant bacterial endospores?

Which one of the following would be considered non-living and acellular?