It has been recently determined that the gene for Duchenne muscular dystrophy (DMD) is more than 2000 kb (kilobases) in length; however, the mRNA produced by this gene is only about 14 kb long. What is a likely cause of this discrepancy?
A) The introns have been spliced out during mRNA processing.
B) The DNA represents a double-stranded structure, whereas the RNA is single-stranded.
C) The exons have been spliced out during mRNA processing.
D) When the mRNA is produced, it is highly folded and therefore less long.
E) There are more amino acids coded for by the DNA than by the mRNA.
Answer: A
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You are "living off the grid" meaning that you are not using any public utilities: no water supply, sewer connection, natural gas, or electricity. You do have a septic tank, whose pipe carries sewage underground where it is released over a wide area, the leaching field. There is also a small pond out there that you have stocked with fish. However, you notice that the fish are floating dead in the water, and the pond has a green scum on it. What happened?
A. There are not enough nutrients in the water, so the fish died. B. Chemical toxins from your septic tank cleaner have killed the fish. C. There is oxygen depletion in the pond due to the leakage of phosphates and other compounds from your septic tank. D. The fish died due to a lack of calcium, which then caused the algae to overgrow.
Amino acids are the building blocks of nucleic acids
1.True 2.False
Striated means
a. multinucleated. b. fibrous. c. voluntary. d. striped. e. bundled.
So far, gene therapy has been most successful in treating
a. malignant melanoma. b. leukemia. c. brain cancer. d. ovarian cancer. e. all of these.