An antigen is:
a. a phagocytic cell.
b. used to combat infections.
c. a molecule used by bacteria to destroy antibodies.
d. any molecule that is recognized as foreign by the immune system.
e. any molecule that is recognized as natural by the immune system.
d
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The three components of the female reproductive system that are required for successful reproduction are the eggs,
____________________, and ____________________. Fill in the blank(s) with the appropriate word(s).
Plants, like animals, grow at all points of their body. Indicate whether the statement is true or false
The myelin sheath plays an important role in neuron structure and function. However, when the myelin sheath is missing or not fully intact, there are consequences
There are many conditions that cause demyelination of neurons, some are autoimmune disorders, such as multiple schlerosis, and others are hereditary. The symptoms of these conditions vary, but often include speech impairment and difficulty coordinating movement. Which of the following correctly connects the symptoms of demyelination with the process of nerve impulse transmission? A) Demyelination prevents the formation of an action potential in sensory neurons that transmit signals from the environment to the central nervous system. B) Demyelination slows nerve impulse transmission. C) Demyelination prevents the uptake of neurotransmitters needed to propagate a message to the next neuron. D) Demyelination targets the central nervous system.
Fluorescent Microscopy
A. uses light beams that are deflected by a different thickness of the object and are reflected when they strike the objective B. is used to observe viruses and the internal structure of thinly sectioned cells C. is used to observe a specimen that emits light when illuminated with an ultraviolet light D. is used primarily to view spirochetes