A mechanism in many salt plants to control osmotic pressure is:
a. to remain as osmoconformers.
b. to have succulent parts.
c. to dry out.
d. to go dormant during periods of high salinity.
e. to drop leaves.
B
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A rosebush needs to increase the concentration of phosphorus in the water within its xylem. Assuming that there is plenty of usable phosphorus dissolved in the water of the surrounding soil, how can the rosebush achieve this?
A. by transporting more phosphorus across the root cortex B. by transporting more phosphorus across root hairs C. by transporting more phosphorus across the root endodermis D. by transporting more phosphorus across the epidermis of roots
In many species, lens crystalline protein aggregates in the eyes to form lenses, yet in other cell types, functions as an enzyme. The gene that encodes this protein is therefore
A) pleiotropic. B) incompletely penetrant. C) eclectic. D) mutant.
Four of the five effects listed below are caused by
abscisic acid. Select the exception. a. may be involved in the dropping of leaves and fruits b. promotes stomata closure c. promotes seed dormancy d. confers resistance to water stress e. stimulates cell elongation
A main function of the carbohydrates that form the glycocalyx is to:
A) maintain the proper fluidity of the plasma membrane. B) regulate water movement into the cell. C) bind cell membranes to the cytoskeleton. D) move large molecules in and out of the cell. E) act as binding sites for signaling molecules.