92. If a given enzyme works only at temperature range of 20 and 45 °C and the potential of hydrogen ions that ranges from 4 to 9. Which one of the following works best during the optimization of these two factors for the enzyme activity?
A. The optimum pH under which this enzyme is most active is found below 4.
B. Adjusting the temperature between 20°C and 45°C results little denaturation and increased number of collisions.
C. Adjusting the pH above 9 can increase the probability of collisions between the enzyme and the substrate.
D. Adjusting the temperature below 20°C makes the enzyme more active, hence the temperature at this value is optimal.
93. All of the following features define a chromosome EXCEPT
A. functional unit of inheritance.
B. made up of DNA and protein.
C. exists in pairs in diploid organisms.
D. contains hundreds to thousands of genes.
94. Which structural and functional difference is observed between DNA and RNA?
A. DNA is very stable molecule while RNA is degraded quickly.
B. RNA stores the genetic material while DNA involves in protein synthesis.
C. RNA produces DNA through the process of transcription.
D. Both DNA and RNA have the same nitrogenous bases but differ in pentose sugar.
95. All of the following events occur during telophase I of meiosis I cell division EXCEPT
A. nuclear envelope reforms.
B. set of chromosomes come together.
C. each of the spindle fibers disappears.
D. crossing over takes place.
Answer (2)
The best statement for optimizing enzyme activity regarding temperature and pH is B, as it recognizes the importance of maintaining the enzyme within its optimal temperature range to prevent denaturation and promote effective substrate interactions. Other statements either misinterpret the enzyme's optimal pH or incorrectly suggest non-optimal conditions. Thus, managing both temperature and pH is essential for efficient enzyme function. ;
The best approach for optimizing enzyme activity regarding temperature and pH is option B, which states that maintaining temperature between 20°C and 45°C results in minimal denaturation and increased substrate interactions. This emphasizes the importance of keeping conditions within the optimal range for the enzyme. Other options either misrepresent the optimal conditions for enzyme activity or suggest less effective approaches.
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