Which option best describes the mechanism that causes a stoma to open?
A) K+ enters the guard cells and water follows passively, making the cells turgid.
B) K+ activates water pumps in the guard cell membrane that make them turgid.
C) K+ leaves the guard cells and water follows passively, making the cells flaccid.
D) Loss of K+ from guard cells creates positive pressure and expands the guard cells.
Answer: A
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The endosymbiosis that formed mitochondria likely occurred after eukaryotes developed photosynthetic capabilities
Indicate whether the statement is true or false.
The main by-product molecule of photosynthesis that is released into the environment is
A. carbon dioxide. B. oxygen. C. glucose. D. ATP. E. chlorophyll.
Which gas has had the greatest impact on life
on earth?
a. carbon dioxide b. methane c. nitrogen d. hydrogen e. oxygen
The above figure represents
a. cloning with a stem cell. b. somatic cell nuclear transfer c. genetic manipulation of a single gene. d. microsurgical manipulation of a chromosome. e. none of these.