The human retina is composed of three cell layers. Which represents the correct order of these layers, starting with the layer that is closest to the iris?
A. ganglion cells ? bipolar cells ? rods and cones
B. optic nerve cells ? rods and cones ? bipolar cells
C. rods and cones ? bipolar cells ? ganglion cells
D. bipolar cells ? ganglion cells ? rods and cones
E. rods and cones ? optic nerve cells ? bipolar cells
A. ganglion cells ? bipolar cells ? rods and cones
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The situation in which an active regulatory protein "turns off" gene expression is an example of
A) a mutation. B) positive control. C) negative control. D) constitutive gene elements. E) unique regulation.
One would expect most strict anaerobic organisms to have superoxide dismutase
Indicate whether this statement is true or false.
In an experiment, the control group is
a. not subjected to experimental error. b. exposed to experimental treatments. c. maintained under strict laboratory conditions. d. treated exactly the same as the experimental group, except for one variable. e. statistically the most important part of the experiment.
In the ABC model of flower development in
Arabidopsis thaliana, sepals form when gene(s) __________ is(are) switched on. a. A b. A and B c. B and C d. C e. A and B and C