Biology Laboratory Manual, 6/e

Darrell S. Vodopich, Baylor University
Randy Moore, University of Minnesota--Minneapolis

Exercise 34 - Bioassay

Choose the one answer that best answers the question.


1	What is auxin?
		A)	a growth hormone
		B)	a photosynthetic pigment
		C)	a macronutrient
		D)	a micronutrient


2	How does a bioassay measure the concentration of a physiologically active molecule?
		A)	measures the exact concentration in tissues
		B)	looks for a color change in tissues with the molecule
		C)	measures the substance's biological activity
		D)	measures the substance's reactivity with other molecules


3	Bioassays could be performed on which of the following substances?
		A)	pesticides
		B)	herbicides
		C)	nutrients
		D)	all of the above


4	An increase in auxin concentrations causes _____.
		A)	a decrease in stem curvature
		B)	an increase in stem curvature
		C)	an enlargement of cotyledons
		D)	an elongation of cucumber roots


5	A decrease in 2,4-D will cause ____.
		A)	a decrease in cotyledon size
		B)	an increase in cotyledon size
		C)	an elongation of roots
		D)	a decrease in stem curvature


6	An increase in gibberellic acid will cause ____.
		A)	a decrease in cotyledon size
		B)	an increase in cotyledon size
		C)	an elongation of roots
		D)	a decrease in stem curvature


7	On a standard curve, what is measured on the x-axis?
		A)	the effect of the chemical tested
		B)	the concentration of the chemical tested
		C)	the number of specimens tested
		D)	the curvature of the stems tested

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