Stomatal opening requires each of the following conditions, except
A. expenditure of energy.
B. a reduction of turgor in the guard cells.
C. water entering the guard cells by osmosis.
D. a lower water potential in the guard cells.
E. pumping of potassium ions into the guard cells.
B. a reduction of turgor in the guard cells.
When guard cells absorb water and become turgid, the stomata are opened. When guard cells lose water and turgidity, the cells cover the stomatal opening which blocks transpiration.
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The figure below illustrates a(n)
a. FAD coenzyme. b. cytosine nucleotide. c. thymine nucleotide. d. ATP molecule. e. adenine nucleotide.
Which of the following is the key regulatory enzyme in glycolysis?
a. phosphofructokinase b. pyruvate dehydrogenase c. citrate synthase d. isocitrate dehydrogenase e. PEP carboxylase
Some cancers can be considered to be multifactorial since both genes and environment are involved in
their expression. Indicate whether the statement is true or false.
Nondisjunction results in
A. two small daughter cells that disappear and two normal-sized cells. B. two polar bodies. C. daughter cells with different numbers of chromosomes. D. two cells with equal numbers of chromosomes.