A solution of an enzyme normally found in the human body was added to a flask containing a solution of proteins in distilled wat
er, and then the flask was stoppered. This mixture was then maintained at a temperature of 27 degrees Celsius and a pH of 7 for 48 hours. When the mixture was analyzed, the presence of amino acids was noted. One way to speed up the production of amino acids in the flask would be to 1. increase the temperature from 27 degrees Celsius to 37 degrees Celsius
2. increase the pH from 7 to 12
3. place the flask in bright light
4. decrease the amount of enzyme added
Answer: 1. increase the temperature from 27 degrees Celsius to 37 degrees Celsius
Explanation:
Generally, protease function optimally at temperature range of 55 to 60 degrees Celsius and at lower pH 5.0 to 5.5. Hence increase in temperature to 37 degrees Celsius will increase proteolysis.
The organism previously used 15N for replication so all the DNA molecules were of 15N15N type. Then the organism is shifted to a medium where only 14N is available for replication.
According to semi conservative mode of replication, a newly synthesised DNA molecule consists of one new strand and one parental strand. So after the first round of replication, All the 15N strands will synthesise new DNA strands using 14N resulting into intermediate 15N14N DNA molecules. Hence, only one band would be observed (15N14N) above the original 15N15N band since 15N14N has lighter isotope too so it will be lighter than 15N15N molecules and will lie above it.
After second round of replication, 15N strand from 15N14N would synthesise another 14N strand. 14N strand from 15N14N molecules will also synthesise another 14N strand. So now, 50% of the DNA molecules will be of 15N14N intermediate type and 50% of them will be of 14N14N type.Two bands will be observed above the original 15N15N band. One band of 15N14N molecules will be right above it and other band of 14N14N molecules will be even higher because it is the lightest band since it has only the lighter isotope of nitrogen.
