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Question 46 (2 points) After photosystem II is produced. is produced and after photosystem O ATP; NADPH NADPH; ATP ATP; FADH2

Rising levels of cylcin increase the levels of OCdks O CAMP o MPF DAG
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Question 46: The correct answer is ATP; NADPH.

Explanation: Photosystems are membrane protein complexes involved in the light absorption and electron transfer mechanism of photosynthesis. Photosystem I (plastocyanin-ferredoxin oxidoreductase) is located on the outer surface of the thylakoid membrane and responsible for NADPH production. Photosystem II (water-plastoquinone oxidoreductase) is located on the inner surface of the thylakoid membrane and involved in the photolysis of water. After photosystem II, ATP is produced.

\bullet The correct answer is MPF.

Explanation: During the cell cycle process, as the levels of cyclin go high, they activate the Cdks(Cyclin-dependent Kinase). The levels of Cdks remain constant throughout the cell cycle.

MPF (Maturation Promoting Factor) can be defined as a cell cycle checkpoint when the cells proceed to the M phase from G2 and it is involved in nuclear envelope breakdown through the phosphorylation of different proteins. As soon as the cell is about to proceed to the M phase from G2, the concentration of M Cyclin goes high and the accumulated M Cyclins bind to Cdks and results in the formation of MPF. So, rising levels of Cyclin increase the levels of MPF.

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