Negative feedback loops to the hypothalamus and the pituitary operate to regulate the levels of ____, the most
important regulator of thyroid hormone secretion.
a. TRH
b. thyroid hormone
c. TSH
d. ADH
e. calcitonin
ANSWER: c
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In the condition called athlete's foot, the fungus Trichophyton consumes the keratin protein found in hair, nails, and dead skin. Which of the following descriptors does not apply to Trichophyton?
A. Saprobe B. Parasite C. Eukaryote D. Heterotroph
Oxygen generally forms two covalent bonds, while carbon generally forms four covalent bonds. In
contrast, helium is inert (generally does not form any bonds). Explain the reason for the differences in chemical behavior between these three elements.
What will be an ideal response?Nonsense mutations change termination codons into amino acid codons
a. True b. False
Major histocompatibility complex (MHC) molecules are what type of membrane protein?
a. enzyme b. anchoring protein c. receptor protein d. recognition protein