Most bacterial cells keep from bursting in a hypotonic environment by:
a. an efficient water pump.
b. a tough cell membrane.
c. pumping large quantities of salts into the cell.
d. a rigid cell wall.
e. a stiff capsule.
D
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Evolutionarily conserved molecules:
A. are similar in sequence among distantly related organisms. B. were likely present in the most recent common ancestor of the organisms possessing them. C. likely changed little over time because they serve a vital function. D. are similar in sequence among distantly related organisms and were likely present in their most recent common ancestor. E. are similar in sequence among distantly related organisms, were likely present in their most recent common ancestor, and have likely changed very little because they serve a vital function.
Which of the following describes the process of eutrophication?
a. Nutrient runoff causes the overgrowth of algae. b. Minerals and nutrients cycle through the biotic world. c. Excess phosphorus decomposes plant roots. d. Rainwater falls to the ground through sulfur dioxide gas.
Could two phenotypically normal parents have a child with cystic fibrosis?
a. Yes b. No
Which statement best describes primary growth in angiosperms?
A) First-year growth occurs at the tips of shoots and roots, and then growth occurs evenly throughout the plant as it ages. B) Growth occurs at the tips of shoots and roots. C) First-year growth occurs evenly throughout the plant, and then growth only occurs at the tips and shoots as it ages. D) Growth occurs evenly throughout the plant.