Studies have shown that in the flowering plant Arabidopsis whether or not a root epidermal cell develops a root hair is
determined ____.
a. by the distance of the cell from the root tip
b. from the timing of cell division
c. by positional information from cells of the root cortex
d. shortly after the eight-cell embryo stage
e. by the direction of cell division
ANSWER: c
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During their experiments with chlorella, Calvin and Benson found no free glucose. Why do you think this is?
A. Glucose takes too long to synthesize. B. Glucose is an isomer of fructose. C. Glucose is stored as starch. D. Glucose would cause H2O to leave the chlorella cells. E. Green algae do not respire when illuminated.
Signals from the parasympathetic nervous system would cause a(n):
a. widening of pupils b. increase in pulse rate c. increase in digestive system movements d. rise in blood sugar level e. rise in metabolic rate
Why is Duchenne muscular dystrophy less common in females than males?
What will be an ideal response?
Which of the following treatments is the most effective for controlling microbial growth?
A) 63°C for 30 minutes B) 72°C for 15 seconds C) 140°C for 4 seconds D) They are equivalent treatments. E) None of the answers is correct.