The blind spot in the human retina is the location that has the collected axons of _____
A) ganglion cells
B) bipolar cells
C) primary visual cortex
D) lateral geniculate nuclei
A
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Which of the following would most likely undergo the fastest rate of evolutionary change?
A. an annual plant B. a blue whale C. a human D. a giant sequoia tree E. bacteria
During synaptic transmission across a typical synapse, which action occurs?
A) Sodium ions flow into the membrane of the presynaptic neuron. B) The binding of neurotransmitters triggers the release of potassium ions by the presynaptic neuron. C) Vesicles containing neurotransmitter molecules diffuse to the receiving neuron's plasma membrane. D) Neurotransmitter molecules bind to receptors on the postsynaptic membrane.
A 9-month-oId infant is seen by a physician because of a persistent skin infection. His white and red blood cell counts are normal. However, immunofixation electrophoresis indicates a low level of IgG. When the infant returns to the physician for a follow-up visit in a month, his IgG level has increased. What condition do these results indicate?
A. Severe combined immunodeficiency B. Transient hypogammaglobulinemia C. Common variable immunodeficiency D. DiGeorge anomaly
Answer the following questions true (T) or false (F)
1. Recent evidence has shown chlorofluorocarbons have no effect on ozone. 2. Scientists predict climate change related to CO2 will increase temperatures over the next century but will have no effect on sea level or precipitation patterns. 3. Warm air can hold more moisture than cold air.