Plant hormones bind specific cellular receptor molecules that trigger gene expression responses. Which statement is correct concerning these responses?
A. Only cells lacking receptors can bind hormones.
B. Only cells in the meristem can respond.
C. Only cells that express the appropriate receptors can bind hormones.
D. Only cells that have been previously activated can bind hormones.
E. None of these choices is correct.
C. Only cells that express the appropriate receptors can bind hormones.
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Which of the following statements about abscisic acid are true? Check all that apply.
_____It is produced chiefly in mature green leaves and in fruits. _____ It stimulates the growth of dormant buds. _____It promotes leaf senescence. _____It plays an important role in controlling the opening and closing of stomata. _____It plays a role in seed dormancy.
You have a patient who complains of pain in his joints. You ask whether he drinks much water during the day and find out he does not. You therefore suspect his nitrogenous waste is deposited in his joints after it is converted from its usual form of
A. uric acid into urea. B. urea into uric acid. C. urea into ammonia. D. uric acid into ammonia. E. ammonia into urea.
Which excretory system contains structures called flame bulbs that function in filtration?
a. metanephridia b. protonephridia c. Malpighian tubules d. kidneys e. nephrons
The enzymes of the citric acid cycle are located in the
A) cytoplasm. B) outer mitochondrial membrane. C) nucleus. D) mitochondrial matrix and inner mitochondrial membrane.