The main reason that the spores of disease-causing bacteria are dangerous is that they _____.?
A) ?are very difficult to destroy
B) ?cause very serious infections
C) ?cause infections that are difficult to diagnose
D) ?destroy the cells they inhabit
A
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Corns are
A. areas of white skin pigmentation. B. growths emanating from the nostrils. C. keratinized conical masses on toes. D. scaly scalp areas.
The subunit of protein is the ________.
A. nucleic acid B. carboxylic acid C. amino acid D. fatty acid
A sarcomere is the
A. contractile thread that extends the length of the muscle fiber. B. plasma membrane of a muscle fiber. C. protein strand composed of actin or myosin. D. structural and functional unit of the skeletal muscle fiber. E. cytoplasm of a muscle fiber.
Which hormone decreases the concentration of calcium ions in body fluids?
A) triiodothyronine B) thymosin C) parathyroid hormone D) thyroxin E) calcitonin