Which of the following statements is correct for stomata opening?
a) Stomata take up K+ into their guard cells, which attracts water to enforce their opening.
b) Stomata export K+ from their guard cells, which causes water to diffuse out, and that is the trigger for stomata to open up.
c) Na+ is the main ion source to control stomata opening in plants.
d) Most critical is the closing of aquaporins in the cell wall of guard cells to open up stomata.
e) Stomata have small muscles that contract and open up the kidney shaped guard cells.
Ans: a) Stomata take up K+ into their guard cells, which attracts water to enforce their opening.
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Which of the following statements is true?
A) A band of ribosomes determines where a cell plate will form in a dividing plant cell. B) The way in which a plant cell differentiates is determined by the position of the nucleus in the developing plant cell. C) Homeotic genes often control morphogenesis. D) Plant cells differentiate because the cytoskeleton determines which genes will be turned "on" and "off." E) The giant sequoia was the first plant to have its genome sequenced.
The bone in the upper arm is the:
a. radius b. ulna c. tibia d. humerus e. femur
Different molecular forms of the same gene are __________.
Fill in the blank(s) with the appropriate word(s).
Over twisting or under twisting of helical DNA generates ________.
A. hypertwists B. hypercoils C. hypotwists D. supercoils