What is the general global pattern of species richness?
A. Increasing from clay soil types into organic soils
B. Increasing from east to west across continental land masses
C. Increasing from tropical seas into temperate forests
D. Increasing from the tropics towards polar areas
E. Increasing from polar areas toward the tropics
Answer: E
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A population of T cells has been stimulated to proliferate in response to a particular antigen. A sample of 1000 cells is examined microscopically, revealing that 200 of these cells are in the various stages of mitosis. Of the remaining 800 in interphase, 400 have x amount of DNA, 250 have 2x, and the remaining 150 have amounts somewhere between x and 2x. Additional analysis reveals that the G2
phase of the cell cycle lasts 2 hours. What is the total length of the cell cycle? A) 2.5 hours B) 4 hours C) 6.4 hours D) 8 hours E) 13.3 hours
As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find that 30,000 molecules of ATP were consumed, but only 20,000 molecules of NADPH were consumed. Where did the extra ATP molecules come from?
A) photosystem II B) photosystem I C) cyclic electron flow D) linear electron flow E) chlorophyll
Treadmilling can occur:
a. Only for the microtubule b. In a test tube for actin filaments and microtubules c. Bit is overridden by dynamic instability d. Only when GTP is hydrolyzed to GDP e. When the alpha and beta subunits bind to GDP
All crocodilians
a. live in or near water. b. are predators with sharp teeth. c. have a four-chambered heart. d. have powerful jaws. e. fit all of these descriptions