39_TestBank_TB

39_TestBank_TB - Biology, 7e (Campbell) Chapter 39: Plant...

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Biology, 7e (Campbell) Chapter 39: Plant Responses to Internal and External Signals Chapter Questions 1) The step(s) between a plant's perception of a change in the environment and the plant's response to that change is (are) best called A) a mutation. B) hormone production. C) pH change. D) signal transduction. E) an "all-or-none" response. Answer: D Topic: Concept 39.1 Skill: Knowledge 2) All of the following may function in signal transduction in plants except A) calcium ions. B) nonrandom mutations. C) receptor proteins. D) phytochrome. E) second messengers. Answer: B Topic: Concept 39.1 Skill: Knowledge 3) Which of the following statements is (are) true of plants? A) Unlike animals, plants cannot respond to stimuli. B) Plants are stationary and are incapable of movement. C) Plants adjust their growth and development in response to environmental cues. D) Only A and B are true. E) A, B, and C are true. Answer: C Topic: Concept 39.1 Skill: Comprehension 4) External stimuli would be received most quickly by a plant cell if the receptors for signal transduction were located in the A) cell membrane. B) cytoplasmic matrix. C) endoplasmic reticulum. D) nuclear membrane. E) nucleoplasm. Answer: A Topic: Concept 39.1 Skill: Comprehension 1
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5) Secondary messengers are associated with which of the following? A) reception B) transduction C) response D) both A and B E) both B and C Answer: B Topic: Concept 39.1 Skill: Knowledge 6) In a signal transduction pathway, the transduction stage amplifies the original signal by A) involving more than one receptor molecule to receive the stimulus. B) having each receptor molecule produce multiple secondary messengers. C) having each secondary messenger activate numerous specific enzymes. D) B and C only E) A, B, and C Answer: D Topic: Concept 39.1 Skill: Comprehension 7) What would happen if the secondary messenger cGMP was blocked in the de-etiolation pathway? A) Specific protein kinase 1 would be activated, and greening would occur. B) Ca 2+ channels would not open, and no greening would occur. C) Ca 2+ channels could open, and specific protein kinase 2 could still be produced. D) No transcription of genes that function in de-etiolation would occur. E) Transcription of de-etiolation genes in the nucleus would not be affected. Answer: C Topic: Concept 39.1 Skill: Application 8) If protein synthesis was blocked in etiolated cells, what would be necessary for any de-etiolation to occur? A) reception of light by phytochrome B) activation of protein kinase 1 by cAMP C) activation of protein kinase 2 by Ca 2+ D) post-translational modification of existing proteins E) A, B, and C Answer: D Topic: Concept 39.1 Skill: Application 9) Which of the following have accelerated recent discoveries about the function of plant hormones? A) the frequent use of brassinosteroids
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This note was uploaded on 03/06/2011 for the course BIOL 1510 taught by Professor Jungh.choi during the Spring '07 term at Georgia Tech.

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39_TestBank_TB - Biology, 7e (Campbell) Chapter 39: Plant...

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