Which of these joints allow movement in only one plane, such as in the knee or elbow?
A) hinge B) ball-and-socket C) fibrous D) cartilaginous
Answer: A
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Gliding motility is a mechanism used by some prokaryotes to swim slowly through liquids.
Answer the following statement true (T) or false (F)
Why is it a good strategy for a microbe to adhere to a receptor that plays a critical function for a host cell?
A. It ISN'T a good strategy-host cells could shift to a backup receptor and shut down production of the main receptor, preventing infection. B. If it's a receptor the cell MUST use, it doesn't have a backup system in place to switch to-so, even though it makes it susceptible to infection, it HAS to put that target out there. This benefits the microbe. C. Microbes need to evade detection and elimination by the immune system-if they adhere to a receptor that plays a critical function, they are less likely to trigger destructive immune responses. This would be similar to using a hostage as a shield in a police-standoff situation. D. It ISN'T a good strategy-by binding to receptors, microbes will be phagocytosed by cells and destroyed within them.
Which biomes tend to have the deepest layers of topsoil?
a. Grasslands b. Deciduous forests c. Deserts d. Coniferous forests e. Tropical rainforests
Encephalitis is an infection of
A) the brain. B) the meninges. C) neurons of the peripheral nervous system. D) the eye. E) the cauda equina.