Cells differentiate by
A) expressing different subsets of genes.
B) expressing the entire genome, then silencing some genes.
C) activating all of the DNA that encodes protein.
D) becoming stem cells.
A) expressing different subsets of genes.
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In the figure above, this group of plants was given treatment V
a. 1 b. 2 c. 3 d. 4 e. 5
Four of the five processes listed below cause stomata
to open. Select the exception. a. activity of abscisic acid b. potassium ions building up in guard cells c. water moving from epidermal cells to guard cells d. turgor pressure increasing in guard cells e. guard cells carrying on photosynthesis
The rate at which mitosis occurs varies dramatically for different types of cells. The most rapid cell division occurs:
a) in the blood and the heart. b) on the skin. c) in the gametes. d) in the blood and the cells lining the various tissues of organs. e) in the liver and the brain.
Arabidopsis thaliana is a small plant commonly known as the thale cress or mouse-ear cress and has approximately 25,000 genes. The human genome also contains approximately 25,000 genes, yet a human is clearly more complex than this plant. Both species
have introns in their genes. Formulate a hypothesis to explain why a human is more complex than Arabidopsis even though the human and the plant have a similar number of genes. What will be an ideal response?