With regard to nutrient pollution in aquatic ecosystems, when is the worst time to apply fertilizer to your lawn?
A) when it is raining, or is about to rain
B) when it is cold, or is about to get cold
C) at the same time you apply pesticides
D) at night
A
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The extracellular matrix can influence the shape of a cell because:
(1) cell adhesion proteins on the plasma membrane attach to the extracellular matrix; (2) cell adhesion proteins attach to the cell's cytoskeleton; (3) the cytoskeleton determines cell shape A. Statement (1) is correct. B. Statement (2) is correct. C. Statement (3) is correct. D. Statement (1) and (2) are correct. E. All of the above statements are correct.
The exoskeleton of arthropods
a. grows with the animal. b. is not waterproof. c. contains chitin. d. is important for the animal's digestion. e. has no functional use.
Gene transcription is induced by
a. A. b. B. c. C. d. D. e. none of these.
Which of the following is a fundamental characteristic of the Notch pathway?
A) It works through nuclear signals involving the lac operon. B) It works through direct cell-to-cell contact. C) It allows mRNAs to accumulate in the posterior portion of the Drosophila embryo. D) It provides symmetry to plant flowers. E) It directs mRNAs to antisense systems in the posterior portion of all organisms.