What sequence of events leads to the perception of a visual scene?
I. In response to light, retinal dissociates from rod and cone photopigments, hyperpolarizing the photoreceptor cells and leading to activation of bipolar neurons.
II. Action potentials are propagated through ganglion cells, whose axons project to the occipital lobe of the brain.
III. In response to light, rod and cone photoreceptors depolarize, causing increased release of neurotransmitter and activation of bipolar neurons.
A. I then III
B. III then II
C. III then I then II
D. I then II then III
E. I then II
E. I then II
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Polygenic inheritance may result in a continuum of phenotypes because
A. the genes that are involved can be considered to be co-dominant B. the alleles for each gene are either completely dominant or recessive. C. there is a low environmental effect. D. there is a high environmental effect.
The nucleus of a differentiated cell contains all of the genetic information necessary to direct the development of an entire organism. This nucleus is therefore said to be ________.
Fill in the blank(s) with the appropriate word(s).
The Nod factor is an important component of
A. the formation of the digestive enzymes of carnivorous plants. B. legume-bacterial interactions. C. mycorrhizal-terrestrial plant interactions. D. the Calvin Cycle. E. trichloroethylene metabolism.
Select the outcomes of meiosis.