Cells are often ground up with abrasive to get to their internal enzymes/molecules, followed by removal of the abrasives. Here are three situations and three outcomes. What is the correct interpretation of the results?
In situation #1, radioactive amino acids are added to cell material, and radioactive proteins are produced. In situation #2, radioactive amino acids, cell material, and the enzyme DNAse (degrades DNA) are added together. Radioactive proteins are still produced. In situation #3, the ground-up cell material is allowed to sit for 24 hours before radioactive amino acids and DNAse are added to it. No radioactive protein is produced. What is the most likely interpretation?
A.
RNA polymerase has no activity after 24 hours, so no mRNA is transcribed and translated into radioactive proteinsin the last scenario.
B. The radioactivity in the amino acids is altering/degrading the tRNA molecules, leading to no protein production in the last scenario.
C.
Natural RNAses present in the ground-up material will degrade any existing mRNAs in that 24-hour interval. Added DNAses breakdown DNA so that new RNAs are not synthesized.This will lead to a loss of capability to translate protein in the last scenario.
D. The results are not interpretable from the information given.
C
You might also like to view...
Why is it problematic to take antibiotics for viral diseases?
What will be an ideal response?
A student forgot to label a beaker containing a DNA solution and a beaker containing a glucose solution. If chemical analysis was performed to identify the contents of each beaker, which of the following would be found in the beaker of DNA but not in the beaker with glucose?
A. Nitrogen and phosphorus B. Carbon atoms C. Hydrogen and oxygen atoms D. Amino acids E. Fatty acids
A monophyletic group has how many common ancestors?
A. One B. Two C. Three D. Many E. It is variable
Most plants absorb water and minerals from the ________ and transport them through the ________.
A. atmosphere; xylem B. soil; phloem C. atmosphere; phloem D. soil; xylem