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Communication Questions

(answers WAY DOWN at bottom of page)

A. Each plant hormone

1. affects only one cell type or physiological process
2. can control a complete developmental process
3. can influence the action of other plant hormones
4. can be matched to an animal hormone of similar chemical structure and action

B. Hormones are

1. located only in the cells that produced them
2. required in large amounts if they are to be effective
3. physiologically inactive in plants
4. initiators of signal transduction pathways
5. very diverse, each one having a specific effect in a plant

C. In order for a cell to respond to a hormone,

1. an appropriate receptor must be present
2. the hormone must be present at an appropriate concentration
3. a signal transduction pathway must be initiated
4. gene expression is usually modified
5. all of the above

D. Phytochrome

1. is a pigment only
2. is an initiator of a signal transduction pathway only
3. is both a pigment and an initiator of a signat transduction pathway
4. detects gravity
5. stimulates cell elongation

E. Which of the following is NOT true of the hypersensitivity response to infection?

1. cell death may be triggered
2. antibiotic compounds may be synthesized in response to a bacterial pathogen
3. defense proteins may be synthesized
4. an avirulence (Avr) factor is not recognized by the plant cell
5. all of the above are true

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Answers: A3, B4, C5, D3, E4