Chapter 19. Chapter 19

Problem-Solving Video Assessment

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Chapter 19 Problem-Solving Video Assessment

(Questions 1 - 3) A new species of photosynthetic bacteria is discovered. These cells contain a photoreceptor pigment that absorbs UV light (peak absorbance of 45 nm).

1.

What is the energy of one mole of 45-nm photons?

4.4 x 10^-21 kJ

5.4 x 10^-12 kJ

2.7 x 10^-5 kJ

2.7 x 10³ kJ

2.7 x 10⁶ kJ

_feedback_correct: Correct. _feedback_incorrect: Incorrect.

2.

How many 45-nm photons are needed to form a single ATP molecule from ADP? Assume ΔG = 50 kJ mol^-1 for the phosphorylation of ADP.

3.7 x 10^-43 photons

3.1 x 10^-26 photons

0.019 photon

53.2 photons

1.1 x 10²² photons

_feedback_correct: Correct. _feedback_incorrect: Incorrect.

3.

How many ATP molecules can these bacteria make from ten 45-nm photons?

8.8 x 10^-22 molecules of ATP

1.9 x 10^-3 molecules of ATP

5.3 molecules of ATP

53.3 molecules of ATP

532.5 molecules of ATP

_feedback_correct: Correct. _feedback_incorrect: Incorrect.

4.

Which of the following statements regarding the relationship between light wavelength and energy capture during photosynthesis is false?

Photons with short wavelengths have more energy than photons with long wavelengths.

Organisms with photoreceptors that absorb short wavelength photons will produce less ATP per photon than organisms with long wavelength photoreceptors.

Short wavelengths require fewer photons to produce ATP than do long wavelengths.

Long wavelength photons will yield less ATP per photon than short wavelength photons.

Organisms with photoreceptors that absorb long wavelength photons must capture more light than organisms with short wavelength photoreceptors in order to produce equivalent amounts of ATP.

_feedback_correct: Correct. _feedback_incorrect: Incorrect.

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Chapter 19. Chapter 19

Introduction

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