Restriction enzymes are obtained from eukaryotes.
a. true
b. false
b. false
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When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result?
A) The gene involved is on the Y chromosome. B) The gene involved is on the X chromosome. C) The gene involved is on an autosome, but only in males. D) Other male-specific factors influence eye color in flies. E) Other female-specific factors influence eye color in flies.
Which of the following offers the best description of neural transmission across nearly all mammalian synaptic clefts?
A. Neural impulses involve the flow of K+ and Na+ across the cleft. B. Neural impulses travel across the gap as electrical currents. C. Neural impulses cause the release of chemicals that diffuse across the cleft. D. Neural impulses travel across the cleft in both directions. E. The calcium within the axons and dendrites of nerves adjacent to a synapse acts as the neurotransmitter.
Which is true about prions?
A. They cause a degenerative brain condition. B. They are naked pieces of RNA. C. They are made of DNA and protein. D. They are a normal brain protein that has folded differently. E. They cause a degenerative brain condition AND they are a normal brain protein that has folded differently.
Common foods that we eat may contain mutagens. Indicate whether the statement is true or false