Cells that are terminally differentiated ______________________
(a) will undergo apoptosis within a few days.
(b) can no longer undergo cell division.
(c) are unable to move.
(d) no longer produce RNAs.
Choice (b) is correct. The life of a terminally differentiated cell depends on the cell type; although terminally differentiated cells in the intestine typically die within a few days, neurons in the brain can last for a lifetime [choice (a)]. Some terminally differentiated cells can still move [choice (c)] and transcribe and translate genes [choice (d)].
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What kind of natural selection can cause two populations?
What will be an ideal response?
Which of the following statements does not describe the leaf epidermis?
a. The cells all contain chloroplasts and photosynthesize. b. Some of the cells are modified to form trichomes. c. The cells are covered by a waxy cuticle. d. The cells are relatively transparent. e. It contains stomata, each of which is flanked by two guard cells.
The way individuals within a population are arranged with respect on one another is called population
A. diversity. B. density. C. logistics. D. distribution.
In lettuce seeds, blue light initiates germination. If you measured hormone levels within the seed, which hormone would be produced upon exposure to blue light?
A) gibberellin B) ethylene C) abscisic acid D) cytokinins