Which of the following is considered to be the unifying theory of biology?
A. theory of relativity
B. the genetic code
C. evolution
D. germ theory
Answer: C
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Mycobacterium tuberculosis has chemicals in its cell wall that inhibit the fusion of phagocytic vacuoles with lysosomes. Which statement is true?
A. Antibodies produced by the cells can more effectively kill the bacteria. B. The bacterium can survive and replicate inside of the phagocytic cell. C. The bacterium can produce chemicals which can destroy the macrophage housing the bacterium. D. Complement proteins will take over to destroy the bacteria.
Meiosis differs from mitosis in that meiosis
a. requires two cycles of division for completion. b. produces spores in plants but gametes in animals. c. is only found in animals and not in plants. d. both a and b.
Proximity of capillaries to tissue cells is crucial
because a. bulk flow operates to move protein-free plasma through clefts between endothelial cells. b. red cells have to squeeze single file through capillaries. c. some proteins exit capillaries by endocytosis and exocytosis. d. this is where nutrient and waste exchange occur. e. all of these are true.
Eukaryotic organisms speed up the process of DNA replication by
A. producing several sliding clamp complexes which provide more binding sites for DNA pol III. B. using multiple origins of replication on each chromosome. C. using DNA gyrase to unravel the double helix rather than DNA helicase. D. shortening the initiation phase.