According to the acid-growth hypothesis, auxin works by _____
A) dissolving sieve plates, permitting more rapid transport of nutrients
B) dissolving the cell membranes temporarily, permitting cells that were on the verge of dividing to divide more rapidly
C) changing the pH within the cell, permitting the electron transport chain to operate more efficiently
D) increasing wall plasticity and allowing the affected cell walls to elongate
E) greatly increasing the rate of deposition of cell wall material
Answer: D
You might also like to view...
All the following antimicrobial agents work by inhibiting cell wall synthesis except:
A) cephalosporins. B) chloramphenicol. C) penicillin. D) vancomycin.
All of the following statements about ferns are correct except
A. ferns flourish in many habitats, but the majority are located in the tropics. B. the sporophyte is a conspicuous generation. C. the gametophyte is a conspicuous generation. D. ferns have underground stems called rhizomes. E. sori are located on the back or ventral surface of fronds.
When Melvin Calvin and Andrew Benson reduced the CO2 available to cells in the photosynthesis
experiments, they discovered that RuBP accumulated. Why did this molecule accumulate?
a. There wasn't sufficient light to drive photosynthesis. b. The cells had too little ATP. c. There were not enough reactants to generate 3PGA. d. The RuBP was defective in structure and unable to form a bond with CO2. e. Rubisco was inhibited by the RuBP excess.
Which of the following has NOT been a basis for classification of the protozoa?
A) means of locomotion B) genetic sequences C) photosynthetic ability D) habitat E) ability to form a dormant stage