The diversity of DNA is due to the _____.
A) bonding patterns
B) sugar-phosphate backbone
C) number of bases
D) variation in base sequences
Answer: D) variation in base sequences
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In the human systemic circulation, list the blood vessels that are encountered as the blood leaves the
heart.
A. arteries B. arterioles C. capillaries D. veins E. venules 1. first vessel category 2. second vessel category 3. third vessel category 4. fourth vessel category 5. fifth vessel category
Which of these are primary lymphatic organs (organs in which blood cells are produced or mature)?
A) lymph nodes B) tonsils C) RED BONE MARROW D) THYMUS GLAND E) spleen
One of the key contributions of the punctuated equilibrium model is that it helps explain
A) why transitional fossils are more common than Darwin would have predicted. B) why transitional fossils tend to be rare and certain common fossil species remain unchanged for long time spans. C) how new species arise from hybridization events. D) why large, widespread populations tend to be the ones that evolve most rapidly and unpredictably.
Based on the following graph, what is the most likely relationship between Paramecium and Didinium?
A. Didinium and Paramecium have a mutualistic relationship. B. Paramecium prey on Didinium. C. Paramecium have a commensal relationship with Didinium. D. Didinium prey on Paramecium. E. Paramecium is a parasite that feeds on Didinium.