Which immune cells do not kill other cells directly?
A. B cells
B. T cells
C. macrophages
D. neutrophils
Answer: A. B cells
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Apical dominance is maintained by
a. hormones released by the terminal bud. b. sugars produced in the leaves. c. water transported from the roots. d. hormones released by the lateral buds. e. sugars produced in the lateral buds.
The production of ATP in the mitochondria requires ____
a. ribosomes b. oxygen c. carbon dioxide d. vesicles e. DNA
Given that mass loss is expressed as a negative exponential function (original mass remaining = e-kt), how much mass would be left after 20 weeks given a decomposition coefficient k = 0.0167 in units of proportion mass loss per week?
A) 0.203 B) 0.716 C) 0.916 D) 1.390
Which of the following statements about the epicotyl is true?
A. It is the portion of the stem axis that is directly below the cotyledons. B. It forms immediately above the secondary roots of a seedling. C. It takes up most of the volume within a monocot or dicot seed. D. It remains in the ground after a seed has germinated. E. The shoot apical meristem of a seedling is located just above it.