In one sentence, explain how it is possible for genetically identical plant cells to become quite different from each
other. What will be an ideal response?
In the process of differential gene expression, genetically identical cells can have different genes being activated while others are inactivated, resulting in those cells becoming
structurally and functionally different.
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Which of the following comparisons between the moss life cycle and fern life cycle are valid?
_____ Mosses have flagellated sperm that need water the reach the female gamete, while the sperm of ferns are unflagellated and are not dependent on water. _____ The sporophyte generation is smaller than the gametophyte generation in mosses, but the sporophyte generation is much larger than the gametophyte generation in ferns. _____ The spores are produced in capsules on stalks in mosses but in small structures called sori on the underside of leaves in ferns. _____ The gametes are produced in gametangia in mosses but in specialized structures on the underside of leaves in ferns. _____ Both kinds of plants depend on wind for dispersal of spores.
56. During low tide a plant cell will have an advantage over an animal cell because of its
A. chloroplasts. B. nucleus. C. mitochondria. D. plasma membrane. E. cell wall.
A membrane is more “fluid” than solid because
a. phospholipid tails prevent close packing. b. proteins can shift positions. c. water is the main component. d. phospholipid tails prevent close packing, and proteins can shift positions. e. phospholipid tails prevent close packing, proteins can shift positions, and water is the main component.
Which of the following statements about monocots is true?
a. They lack sclerenchyma tissue. b. They have a well-developed vascular cambium. c. They do not produce bark. d. Their lateral meristems give rise to wood. e. Secondary growth occurs rather slowly.