Hiv
A. appears to cause AIDS.
B. is an RNA virus.
C. destroys T helper cells.
D. makes the patient vulnerable to infections, especially those caused by opportunists.
E. All of the choices are correct.
E
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Immunoglobulin A (IgA) is mainly found
A. in the bloodstream B. in the spleen C. in the thymus D. on body mucous membranes E. on body skin
Which statement best explains contact inhibition?
a. Contact between neighbouring cells triggers reactions that lead to inhibition of mitosis. b. As cell number increases, the level of waste products increases, consequently slowing metabolism and leading to mitosis. c. As cell number increases, the protein kinases they produce compete with neighbouring cells, thus inhibiting mitosis. d. As neighbouring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur.
The purpose of DNA replication is to produce ______
A. Two daughter strands B. Two parental strands C. Two template strands D. None of the answers are correct
Which would be TRUE if a metabolic poison were to completely inhibit the function of mitochondrial ATP synthase?
A. The pH difference across the inner mitochondrial membrane would decrease. B. The pH difference across the inner mitochondrial membrane would increase. C. ATP synthesis would increase. D. Oxygen consumption would decrease. E. The accumulation of NADH would increase.