Some genetic mutations occur from exposure to external agents called ____, such as radioactivity, ultraviolet radiation from the sun, and certain natural and human-made chemicals.
A) ?mutagens
B) ?heritable traits
C) ?keystones
D) ?niches
E) ?antibiotics
Ans: A) ?mutagens
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Why is green fluorescent protein (GFP) very useful in visualizing fusion proteins in eukaryotes?
A. The reaction is only dependent on the presence of GFP and ATP. B. It is easily cloned and expressed in bacterial cells. C. The presence of just a few molecules of GFP fusion proteins can be sufficient to create fluorescence. D. It is derived from fireflies, which are easy to cultivate in the lab. E. The GFP protein recognizes and binds to fusion proteins, allowing the location of the fusion protein to be determined.
Which of the following experimental procedures is most likely to speed up mRNA degradation in a eukaryotic cell?
a. removal of one or more exons b. lengthening of the poly-A tail c. removal of the 5' cap d. removal of C nucleotides
Your sister cut herself with a knife, and within a few days, she had a severe pus-producing infection of the hand. A day later, skin begins to come off, exposing muscle and other tissue below the skin. Predict what caused the severity of this infection.
A. The infectious agent is a fungus. B. This is not an infectious disease; it is an autoimmune disease. C. The infectious agent is likely a virus. D. The infectious agent produces exotoxins.
In slash-and-burn agriculture, the yield from the first crop is usually quite high. Indicate whether the statement is true or false