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.
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.
Which gas has had the greatest impact on life
on earth?
a. carbon dioxide b. methane c. nitrogen d. hydrogen e. oxygen