________ stimulates the thyroid gland to secrete thyroid hormones.
A. TH
B. TIH
C. T4
D. TSH
Answer: D
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Helper T-lymphocyte activation involves MHC class I, whereas cytotoxic T-lymphocyte activation involves MHC class II
Indicate whether this statement is true or false.
All but one of the following is a function of the low pH found in the stomach. Select the description below that does not reflect a role of stomach acid
A) The stomach's acid catabolically breaks down food stuffs in preparation for absorption. B) Stomach acid denatures proteins making the poly peptide chain more accessible to pepsin digestive enzymes. C) Many potentially harmful bacteria will be prevented entry to the small intestine by stomach acid. D) Low pH converts pepsinogen to its active form of pepsin, preventing the protease enzyme from digesting the cells that produce it.
Factor X is related to thrombin in the same way that thrombin is related to
a. prothrombin b. fibrin c. fibrinogen d. plasminogen e. thromboplastin
The smallest stable units of matter are
A) atoms. B) molecules. C) protons. D) neutrons. E) electrons.