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Science · Drill 72

Science practice 72

5 questions ~9 min recommended
⏱ 00:00
Score
—

101

Rate of reaction

102

ime of renctio Water volume (ml.)

Residue concentration (mg/mL.) (amino acid concentration constant)

103

9 0.2 04 0.6 0.8 1.0 12 14 1.6 18 20 Amino acid concentration (mg/mL.) (initial residue concentration constant)4

5

PASSAGE I

Amino acids are considered the building blocks of protein in the body. Amino acids combine with each other to form chains called peptides, which then combine to form proteins. The human body requires twenty different amino acids, whose combinations produce every essential protein in the body. When amino acids form peptides, the residue is what is left after the amino acid sheds a molecule of water (a hydrogen ion from one end and a hydroxide ion from the other end). The reaction rate is the factor by which the protein is able to build itself up through the combination of peptides. Figures 1-3 show the effects that changes in temperature, water volume, and residue concentration have on the rate of reaction when Amino Acids A and B are present. Figure 4 shows the effects that changes in the concentrations of Amino Acids A and B have on the rates of reaction in solutions of the same concentration.

Figure 1

Figure 2

Figure 3

Figure 4

1. According to Figure 2, Amino Acid A has the highest reaction rate at a water volume closest to:

2. Based on the data presented in Figure 2, at approximately which of the following water volumes does Amino Acid A have the same reaction rate as Amino Acid B?

3. A researcher claims that the reaction rate of Amino Acid B is dependent on both residue concentration and amino acid concentration. Do the data in Figures 3 and 4 support this claim?

4. A researcher claims that under the conditions used to determine the data for Figure 4, the reaction rate for Amino Acid A at any given concentration will always be greater than the reaction rate for Amino Acid B at the same concentration. Do the data support this conclusion?

5. The figure below shows the relative reaction rates for alanine, an amino acid found in DNA, and glycine an amino acid found in the muscles.

Based on this figure, one would best conclude that compared to the water volume at the peak reaction rate of amino acids in DNA, the water volume at the peak reaction rate of amino acids in the muscles:

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