A control group ____
a. receives the same treatment as the experimental group
b. is an untreated group of individuals or subjects
c. is sometimes exposed to harsh conditions
d. is often an unnecessary waste of material
e. is not subjected to experimental error
ANSWER: b
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A stem on its side will turn up because
a. cells elongate on the down side. b. of gravitropism. c. statoliths sink to the gravity side of the stem. d. of the activity of auxin. e. of all of these.
Membrane proteins may function in
A) receiving extracellular signals. B) amphipathic modification. C) temperature control. D) protein manufacture. E) information storage.
Which of the following hormones promotes cell elongation in stems?
A) auxin B) cytokinin C) ethylene D) gibberellin
Primary xylem and phloem are produced by the
A. protoderm. B. procambium. C. leaf primordial. D. proembryo. E. ground meristem.