How does gibberellin actually work?
A. In the presence of blue light, it triggers additional photosynthesis and growth.
B. In the presence of light, it increases the turgor pressure of the cell and accelerates growth.
C. In the presence of unidirectional light, it moves to the shady side and activates an ATP-driven proton pump that results in weakened cell walls and eventual elongation.
D. In the presence of light, it increases the formation of additional DNA that codes for additional plant structures.
E. It attaches to a plasma membrane receptor and results in gene activation to produce the enzyme amylase that releases sugars for additional cell growth, division, and elongation.
Answer: E
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Fill in the blank with the appropriate word.
Greenhouse gases _____
a. help keep Earth's surface warm enough for life b. are released by natural and human activities c. are at higher levels than they were 100 years ago d. all of these
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a. viruses. b. proteins. c. infectious bacteria. d. parasites. e. fungi.
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A) contact inhibition B) unusual shapes and sizes C) immortality D) All of the above are characteristics of cancerous cells.