Use Figure 8

question 57

Multiple Choice

Use Figure 8.2 and the compounds labeled A, B, C, D, and E to answer the following questions.
Figure 8.2
-To identify the molecule that accepts CO2, Calvin and Benson manipulated the carbon-fixation cycle by either cutting off CO2 or cutting off light from cultures of photosynthetic algae. They then measured the concentrations of various metabolites immediately following the manipulation. How would these experiments help identify the CO2 acceptor? Study Figure 8.2 to help you in determining the correct answer.

• A) The CO2 acceptor concentration would decrease when either the CO2 or light is cut off.
• B) The CO2 acceptor concentration would increase when either the CO2 or light is cut off.
• C) The CO2 acceptor concentration would increase when the CO2 is cut off, but decrease when the light is cut off.
• D) The CO2 acceptor concentration would decrease when the CO2 is cut off, but increase when the light is cut off.
• E) The CO2 acceptor concentration would stay the same regardless of the CO2 or light.

---

Definitions:

Friedman Test

A non-parametric statistical method for identifying treatment differences across several trials.

Sign Test

An assessment method without parametric assumptions, designed to check for differences in the median of matched data points.

Randomized Block Experiment

An experimental design that groups subjects into blocks based on certain characteristics before randomly assigning treatments within each block to reduce variation.

Interval

A range of values between two points, often used in statistics to describe the confidence levels of estimations or predictions.