Chlorophyll Catabolism and Pheophytin Synthesis

Chlorophyll Catabolism and Pheophytin Synthesis

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Science, Biology, Religious Studies, Chemistry, Social Studies

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The video explains the chlorophyll cycle and its degradation in plants, focusing on the conversion of chlorophyll B to A and the role of enzymes like chlorophyllase and magnesium dechelatase. It highlights how chlorophyll degradation affects leaf color, emphasizing the role of carotenoids in autumn foliage. The process involves breaking down chlorophyll into catabolites, which emit different colors, contributing to the seasonal color changes in leaves.

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7 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary chlorophyll that gets degraded in plants?

Chlorophyll B

Chlorophyll C

Chlorophyll A

Chlorophyll D

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the function of magnesium dechelatase in chlorophyll degradation?

It adds magnesium to chlorophyll

It hydrolyzes the phytel side chain

It removes magnesium from chlorophyll

It converts chlorophyll A to B

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which molecule is critical for the function of photosystem 2?

Pheophytin

Red Chlorophyll Catabolite

Chlorophyll B

Chlorophyllin A

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of pheophytin in photosynthesis?

It acts as an electron donor

It acts as an electron acceptor

It absorbs red light

It emits green light

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the chlorophyll molecule when it reacts with magnesium dechelatase?

It gains a methyl group

It loses its magnesium

It loses its phytel side chain

It becomes chlorophyllin A

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What causes the leaves to turn red in autumn?

Increase in chlorophyll B

Presence of carotenoids

Formation of red chlorophyll catabolite

Degradation of chlorophyll

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main degradation product of chlorophyll?

Chlorophyllin A

Pheophytin

Red chlorophyll catabolite

Primary fluorescent chlorophyll catabolite