Question

multiple choice question
which of the following is true about chlorophyll versus retinal?

chlorophyll is more efficient at capturing photons.
chlorophyll absorbs more kinds of photons.
retinal reflects green light.
retinal is more efficient at capturing photons.

Explanation:

To solve this, we analyze each option:

1. Chlorophyll efficiency in photon capture: Chlorophyll is optimized for photosynthesis, but retinal (in visual systems) is highly efficient at capturing photons for vision. So "Chlorophyll is more efficient..." is incorrect.
2. Photon types absorbed by chlorophyll: Chlorophyll mainly absorbs red and blue photons, while retinal (in visual pigments) can interact with a range, but chlorophyll doesn't absorb "more kinds"—so this is incorrect.
3. Retinal and green light reflection: Retinal - based pigments (like in rhodopsin) don't reflect green light. Chlorophyll reflects green (appears green), but this statement about retinal is false.
4. Retinal's photon - capturing efficiency: Retinal in visual pigments is highly efficient at capturing photons to initiate the visual signal - transduction pathway. It has a high quantum efficiency in photon capture for vision, making this statement true.

Answer:

D. Retinal is more efficient at capturing photons. (Note: Assuming the options are labeled A - D as per typical multiple - choice, with the last option being D here. If the original labeling was different, adjust the identifier, but the text is "Retinal is more efficient at capturing photons.")