Thigmotropism
What will be an ideal response?
plants responding to touch
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You observe a houseplant on your window sill bending toward the bright afternoon sunlight. Being knowledgeable, you wish to explain the molecular events of the phototropic response to your friend. What is the correct sequence that you would describe?
I. PHOT1 attains a phosphate group, and changes shape II. cell elongation occurs on the shady side of the plant III. auxin binds its receptor at target tissues IV. light strikes PHOT1 V. PHOT1 stimulates downward auxin transport on the shady side of the plant VI. light strikes stomates, which close, minimizing water loss VII.cells on the illuminated side of the plant become shorter A) VI, VII, II B) VII, II, III, I C) IV, I, V, III, II D) IV, VI, III, VII E) any of these sequences can initiate phototropism
The hormone that helps us respond to low oxygen levels by promoting an increase in red blood cell counts is
A. erythropoietin. B. hemopoeitin. C. renin-angiotensin. D. adrenocorticotropin. E. estradiol.
In the prokaryotic lac operon system, a repressor remains bound to the ____ unless lactose is present
a. operators b. promoter c. enhancer d. operon e. gene
Who first demonstrated transformation using mice and two strains of Streptococcus pneumoniae?
A. Griffith B. Watson and Crick C. Avery, McCarty, and MacLeod D. Hershey and Chase E. Jacob and Monod