Topic 4 Photosynthesis

Question 1

• Process that occurs in the chloroplast and harnesses light energy to synthesize glucose

Answer 1

Photosynthesis

Question 2

1. Begins with light-absorbing pigments in plant cells, known as chlorophyll a, chlorophyll b, and carotenoids
2. Light is incorporated into electrons causing them to excite and become un-stable. The electrons re-emit the absorbed energy and it is reabsorbed by electrons in close pigment molecules
3. Ends with energy is absorbed by two special chlorophyll a molecules: P680 and P700
   a. P700: forms pigment cluster 2, PSII

Answer 2

Photosynthesis Reaction

Question 3

• Chlorophyll b, phycobilin (red and blue algae pigment), carotenes, xanthophylls
• Capture wavelengths which chlorophyll a does not, and passes energy to chlorophyll a

Answer 3

Antenna Pigments

Question 4

• Has porphyrin ring consisting of double and single bonds, and a central Mg atom. The double bonds are critical for light reactions.

Answer 4

Chlorophyll a