SAT Subject Biology Practice Question 460: Answer and Explanation

Next steps

Question: 460

10. Questions below refers to the following experiment involving human liver cells.

Aspartate aminotransferase (AAT) is an enzyme produced in liver cells that catalyzes an important step in the metabolism of amino acids. The production of AAT is dependent upon various hormonal stimuli. Human liver cells were cultured; half the cultured cells were used to measure the amount of AAT mRNA present, and half were used to measure the amount of AAT present. Measurements were taken at five-minute intervals following hormonal stimulation of the cells.

Figure 1 shows the results of this experiment.

Figure 1

The experiment was repeated, this time adding an inhibitor of protein synthesis along with the hormone.

Figure 2 shows the results of this experiment.

Figure 2

Figure 2 sh

A. protein
B. hormone
C. lipid
D. inhibitor
E. amino acid

Correct Answer: A

Explanation:

A Even without looking at Figure 2, the experiment description states that AAT is an enzyme, and enzymes are proteins. Figure 2 confirms this, because when an inhibitor of protein synthesis was added to the mix, no AAT was made.

Previous       Next