Which of the following ecosystems has a very high net primary productivity?
A. desert
B. tropical rain forest
C. temperate forest
D. boreal forest
E. tundra
Ans: B. tropical rain forest
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During alternation of generations in plants, haploid gametes are produced by mitosis
1.True 2.False
If short hair (L) is dominant to long hair (l), then what fraction of the offspring produced by a cross of Ll ยด ll will be
homozygous dominant? a. 1/2 b. 1/4 c. 1/3 d. 0 e. 2/4
Inflammation is characterized by
a. redness. b. swelling. c. heat. d. pain. e. all of the above.
Which of the following statements about actin is false?
(a) ATP hydrolysis decreases actin filament stability. (b) Actin at the cell cortex helps govern the shape of the plasma membrane. (c) Actin filaments are nucleated at the side of existing actin filaments in lamellipodia. (d) The dynamic instability of actin filaments is important for cell movement.