Rickettsias differ from chlamydias in that rickettsias A) Are gram-negative. B) Are intracellular parasites. C) Require an arthropod for transmission. D) Form elementary bodies. E) Lack cell walls.

In what stage of meiosis is crossing over most likely to occur?

What type of protist causes Giardia

A mineral that should be emphasized in the diets of older adults is:

Which of these is NOT a direct factor that controls biotic potential? a. The resources available for each individual b. Genetic mutations c. The age at which reproduction generally begins d. Reproductive rate e. Predators and pathogens

What is the largest north american bear?

Did your pulse change when standing? Why do you think a change did or did not occur?

What factors affect the activity of an enzyme?

How can the lymph system reduce the spread of cancer? A. By producing lymphocytes, which attack and kill cancer cells B. By producing lymphocytes, which create antibodies against cancer cells C.

During warmer months, manatees have been sighted from: a) North Carolina to Texas b) Massachusetts to Texas c) None if the answers provided d) Georgia to Alabama

The parts of the brain that decrease in volume as senescence begins are called: