Cytokines released by TH1 cells
A) activate CD8+ cells to CTLs.
B) convert TH1 cells to TH2 cells.
C) convert TH2 cells to TH1 cells.
D) kill parasites.
E) convert B cells to T cells.
A
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Which one of the following is caused by the secretion of atrial natriuretic hormone by the heart?
A) decrease in blood pressure B) decrease in blood calcium level C) decrease in kidney function D) increase of blood sugar level E) increased production of fats and proteins
Which type of molecule has the potential to perform the catalytic act of reproducing itself?
A. RNA B. proteins C. polysaccharides D. DNA
What portion of the cell contains microtubules and microfilaments?
a. nucleus b. mitochondria c. cytoskeleton d. smooth ER e. rough ER
Which of the following is TRUE of fertilization?
A. It is critical to maintaining membrane polarity. B. It restores the egg to a diploid state. C. It both restores the egg to a diploid state and maintains membrane polarity. D. It activates cell division. E. It both restores the egg to a diploid state and activates cell division.