Question
The graph shows the activity of an enzyme at various temperatures. The pH of the experiment was
kept constant at pH 8.
Based on the data, what would the result be if the experiment was repeated at pH 9?
A. The enzyme activity would be higher.
B. The results of the enzyme activity would be almost the same.
C. The enzyme activity would be lower.
D. There is not enough information to make a reliable prediction.
Answer/Explanation
Question
A molecule of DNA is found to contain 200 guanine bases, representing 25% of the total number of bases. How many phosphate groups does this molecule of DNA contain?
A. 50
B. 200
C. 800
D. 1000
Answer/Explanation
Question
What is a universal characteristic of the genetic code?
A. There are more than 64 different anticodons.
B. There are more nucleotides than codons.
C. There are more codons than amino acids.
D. There are two or more amino acids for each codon.
Answer/Explanation
Question
The graph shows the changes in lactate measured in an athlete’s blood during exercise.
Which hypothesis provides the most likely explanation for the curve?
A. As exercise intensity increases, lactate is converted back to glucose.
B. Anaerobic exercise results in high levels of lactate.
C. Lactate provides energy for intense exercise.
D. Under anaerobic conditions the body produces less lactate.
Answer/Explanation
Ans:
Question
Which feature(s) allow(s) transport of glucose in blood plasma?
I. It is hydrophobic.
II. It is polar.
III. Its solubility is low at 37°C.
A. I only
B. II only
C. I and II only
D. II and III only