Ectopic thyroid tissue may be identified through biopsy due to the unique presence of:
A. Calcium Crystals
B. Colloid
C. Hassall's Corpuscles
D. Smooth Muscle
E. T-Cells
Ans: B. Colloid
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Which of the following is true about attenuated vaccines?
a. They run a high risk of causing a full-blown case of the disease. b. One vaccine can prevent a multitude of infectious diseases. c. They lead to better and longer-lasting immunity. d. They lead to less-effective and shorter immunity.
Which of the following is the binding site for RNA polymerase on the DNA molecule?
a. structural genes. b. repressor gene. c. promoter sequence. d. operator sequence. e. region between an operator and the first structural gene.
What muscle tissue contains specialized junctions that allow cells to contract as a unit?
a. skeletal only b. smooth only c. cardiac only d. both skeletal and cardiac e. both cardiac and smooth
Complementary base pairs are held together by
A) disulfide bonds. B) peptide bonds. C) covalent bonds. D) hydrogen bonds. E) ionic bonds.