42. Which of the following ion plays a key role in extracting electrons from H2O to form O2 in photosystem II of photosynthesis? (A) Calcium (B) Natrium (C) Manganese (D) Iron

4. Which description is NOT correct? (A) A nucleic acid consists of four kinds of bases linked to a sugar–phosphate backbone. (B) A pair of nucleic acid strands with complementary sequences can form a double-helical structure. (C) DNA is a structurally rigid molecule that only exist in a specific helical form. (D) Double-stranded DNA can wrap around itself to form a supercoiled structure.

42. Which of the following ion plays a key role in extracting electrons from H2O to form O2 in photosystem II of photosynthesis?
(A) Calcium
(B) Natrium
(C) Manganese
(D) Iron

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