Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 30, Problem 3SQ
Summary Introduction
Concept introduction: Plant hormones or phytohormones are the chemical molecules produced by plant tissues in extremely low concentrations for regulating many cellular processes. These hormones are very essential for plants as they decide many different attributes necessary for their growth. The major characters determined by plant hormones are flowering, shedding of leaves, shoot and root elongation, ripening of fruits and abscission.
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what happens when an agonist, instead of the endogenous (natural) hormone binds to the hormone recepters of a target.
A. an antagonist is necessary to remove the agonist
B. the agonist blockd any response in the target cell
C. the cell responds by producing its own hormone
D. transcription factors are blocked from binding to the promotor region
E. the agonist has the same effect as the endogenous hormone.
Match the hormone with the observation. ___ ethylene a. Your cabbage plants form ___ cytokinin elongated flowering stalks. ___ auxin b. The potted plant in your room ___ gibberellin is leaning toward the window. ___ ABA c. The last of your apples is getting ___ nitric oxide really mushy. d. The seeds of your roommate’s marijuana plant do not germinate no matter what he does to them. e. Lateral buds are sprouting. f. Your lettuce plants develop brown spots on their leaves.
Plant hormones contained in soy may have effects on humans similar to those of
a. aspirin.v
b. Vitamin C
c. cholesterol.
d. growth hormone.
e. Estrogen.
Chapter 30 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 30 - Volatile Secondary Metabolites in Plant Stress...Ch. 30 - Volatile Secondary Metabolites in Plant Stress...Ch. 30 - Volatile Secondary Metabolites in Plant Stress...Ch. 30 - Prob. 4DAACh. 30 - Prob. 1SQCh. 30 - Prob. 2SQCh. 30 - Prob. 3SQCh. 30 - _______ is the hormone in most rooting compounds....Ch. 30 - Prob. 5SQCh. 30 - Prob. 6SQ
Ch. 30 - Prob. 7SQCh. 30 - Ethylene differs from other hormones in that it...Ch. 30 - Prob. 9SQCh. 30 - Prob. 10SQCh. 30 - Prob. 11SQCh. 30 - Prob. 12SQCh. 30 - Match the hormone with the description. _____...Ch. 30 - Prob. 14SQCh. 30 - Prob. 15SQCh. 30 - Professional gardeners often soak seeds in...Ch. 30 - Photosynthesis sustains plant growth, and inputs...Ch. 30 - Prob. 3CTCh. 30 - Cattle in industrial dairy farms are typically...Ch. 30 - The oat coleoptiles on the left have been...
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- All known hormones in plants are regulated by proteasomes. Which of the following describes the molecular mechanisms that promote increased levels of hormones in plants? Select one: a. synthesis of a suppressing molecule b. degradation of the promoting molecule c. synthesis of a promoting molecule d. degradation of a suppressing moleculearrow_forwardEndocrine signals are transmitted more slowly than paracrine signals because ___________. a. the ligands are transported through the bloodstream and travel greater distances b. the target and signaling cells are close together c. the ligands are degraded rapidly d. the ligands don't bind to carrier proteins during transportarrow_forwardwhat happens to a water souble hormone after it binds to a receptor on the target cell? select all that apply A. the hormone unbinds the receptor or pops back off B. the hormone is broken down by an enzyme C. the hormone is transported into the cell where it is destroyed by enzymes d. the hormones is transported into the cell where it promotes transcription.arrow_forward
- which of the following happens when a therapeutic synthetic homone is introduced intno the body to treat patients natural hormone insufficiency?(select all that apply) A. The target cell responds the same way as when the hormone is natural B. the synthetic hormone has no effect on the target tissues C. the amount of natural hormone produced by the patients body declines D. the synthetic hormone is destroyed before it can have an effect on the target tissue.arrow_forwardEthylene differs from other hormones in that it_____ . a. is a gas c. operates during ripening b. participates in defense d. none of the abovearrow_forwardSteroid hormones a. can diffuse through the membrane without a carrier. b. have a direct effect on gene expression. c. bind to membrane receptors. d. Both a and b are correct.arrow_forward
- When a catecholamine or peptide hormone binds to receptors on the surface of a cell, A. The hormone is transported to the nucleus where it alters the activity of dna. B. The cell membrane becomes less permeable. C. The cell becomes inactive. D. A second messenger appears in the cytoplasm.arrow_forwardA hormone differs from a neurotransmitter in thata. hormones act extracellularly, whereas neurotransmitters act withinthe cell that synthesized them.b. hormones are released only by neurons, whereas neurotransmittersare released by many different types of cells.c. hormones cause only fast responses (seconds or less) to stimuli,whereas neurotransmitters cause slow responses (minutes to hours)to stimuli.d. hormones affect only epithelial cells, whereas neurotransmittersaffect only muscle cells.e. hormones are released into the bloodstream and can activate manycells in many parts of the body, whereas neurotransmitters arereleased by neurons and affect adjacent cells.arrow_forward23. The endocrine system uses hormones that are _______________ traveling via blood or lymph. a. local acting signals b. same cell signals c. neighboring cell signals d. short distance signals e. long distance signalsarrow_forward
- Which of the following statements is truc a. Neurotransmitters must bind to a receptor to exert an action on a cell but hormones do not have to bind to a receptor to exert an action b. The nervous system effects are longer lasting than the endocrine system c. The nervous system effects are faster to respond than the endocrine system d. The nervous system releases neurotransmitters into the bloodstream similar to how the endocrine system releases hormones into the bloodstreamarrow_forward______are signaling molecules that travel through the blood and affect distant cells in the same individual. a. Hormones c. Pheromones b. Neurotransmitters d. Neuromodulatorsarrow_forwardThe action of steroid hormones is different from that of peptide hormones becausea. peptide hormones must enter the cell to begin action, whereas steroid hormones must begin action on the external surface of the cell membrane.b. steroid hormones must enter the cell to begin action, whereas peptide hormones must begin action on the external surface of the cell membrane.c. peptide hormones produce a hormone receptor complex that works directly on the DNA, whereas steroid hormones cause the release of a secondary messenger that triggers enzymes.d. None of these answers is correct.arrow_forward
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