People with very light skin have ________.
A) more melanocytes than people with very dark skin.
B) fewer melanocytes than people with very dark skin.
C) about the same number of melanocytes as people with very dark skin.
D) red melanocytes.
C) about the same number of melanocytes as people with very dark skin.
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Based on the energy and carbon sources of humans, how would humans be classified?
A. as chemoautotrophs B. as chemoheterotrophs C. as photoheterotrophs D. as photoautotrophs
What do you know about the number of neutrons in an atom? How does it relate to the question?
What will be an ideal response?
The molecular explanation for narcolepsy is that
A) certain brain cells have many extra orexin/hypocretin receptors, so these cells receive too many messages to sleep. B) the orexin/hypocretin receptor does not reach the cell surfaces of certain brain cells. C) a gene is missing in chromosome 6 that encodes the protein narcoleptin. D) a viral infection activates genes that promote sleep.
Lipid rafts are associated with which of the following activities?
A) responding to extracellular signals B) transport of nutrients across cell membranes C) immune responses D) transport of cholera toxin into cells E) All of the above are correct.