Myasthenia gravis disease arises from the production of autoantibodies against
A. sodium pump proteins in the cell membrane.
B. acetylcholine receptors on skeletal muscle.
C. myelin sheath cells of the nervous system.
D. cells in thyroid follicles.
E. acetylcholine receptors on smooth muscle.
Answer: B
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Bacterial cells are placed into a 250mL liquid growth medium in a closed laboratory flask. According to Malthusian theory, they will reproduce exponentially and then:
A. continue reproducing arithmetically as long as there are no limitations on food supply. B. continue reproducing geometrically as long as there are no limitations on food supply. C. continue reproducing arithmetically until the food supply is used up, then they will cease to grow. D. continue reproducing geometrically until the food supply is used up, then they will cease to grow.
Cycads and Ginkgo are similar in that they produce nonmotile sperm
____________________ Indicate whether the statement is true or false.
Chilling, freezing, and desiccation are
A) microbicidal. B) microbistatic. C) disinfectants. D) sterilants.
Signaling by neurotransmitters is an example of _______ signaling.
a. autocrine b. endocrine c. paracrine d. direct cell-to-cell