The oldest cells in a mature leaf are found
a. at the base of the leaf.
b. near the very center of the leaf.
c. at the stomata.
d. at the leaf tip.
e. as files of cells at the widest point of the leaf.
D
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In meiosis, sister chromatids ____
a. separate before DNA replication b. separate before crossing-over c. separate during anaphase I d. separate during anaphase II e. never separate; sister chromatids do not separate in meiosis.
In the Northern Hemisphere, the summer ________ occurs when solar rays fall directly on the Tropic of Cancer
Fill in the blank(s) with correct word
The white-footed mouse, deer, and deer ticks are important to maintaining the zoonotic transmission cycle associated with ________.
A. babesiosis B. Q fever C. Lyme disease D. Rocky Mountain spotted fever E. plague
Which of the following statements is NOT true about the germinated pollen grain?
A. Fertilization occurs when the pollen grain germinates. B. The generative cell produces two sperm. C. There are two sperm nuclei that move down the pollen tube to the micropyle. D. The pollen tube forms in the style. E. The tube cell produces the pollen tube.