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Subject Test Biology

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SAT Subject Test

The graph below illustrates the data obtained from reactions at various temperatures of an enzyme with its specific substrate at pH 6.

 

The figure presents a graph in the first quadrant. The horizontal axis is labeled Temperature in degrees Celsius and is numbered, from left to right, from 0 to 100 in increments of 10. The vertical axis is labeled Product. The 7 dots shown in the graph rise and then fall with increasing temperature. Each of the first 4 dots, starting near the horizontal axis at 10 degrees, is at a higher level on the vertical axis than the previous dot, up to a temperature of 40 degrees Celsius. For temperatures of 50, 60, and 70 degrees Celsius, each of the dots is at a lower level on the vertical axis than the previous dot, ending close to the horizontal axis at 70 degrees.

Based on the data, what results can be predicted if the experiment is carried out at 5 degrees?

Select an Answer

No prediction would be valid.

Correct Answer: 
No

An amount of product equal to that at 20 to the power of ring operator text C end text would be formed.

Correct Answer: 
No

An amount of product equal to that at the optimum temperature would be formed.

Correct Answer: 
No

An amount of product equal to that at 60 to the power of ring operator text C end text would be formed.

Correct Answer: 
No

Little or no product would be formed.

Correct Answer: 
Yes

The correct answer is that relatively little product would be formed (E). This question requires you to extrapolate from the data in order to predict the amount of product that would likely be formed at a temperature lower than the temperatures tested. Choice (A) indicates that no prediction can be made. While the amount of product at 5 degrees can not be known with certainty, it can be predicted from the information provided, so choice A is not correct. Choices (B), (C), and (D) suggest that the same amount of product will be formed at 5 degrees as at 20, 40, and 60 degrees, respectively. This is unlikely, based on the pattern of the data. Between 10 and 40 degrees the amount of product formed varies with temperature, so the most reasonable prediction is that there would be very little product formed at 5 degrees.

Question Difficulty: 
hard