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历届国际生物学奥林匹克竞赛精选试题及答案（英文）

1. When the base composition of DNA from bacterium Mycobacterium tuberculosis was determined, 18 % of the bases were found to be adenine. What is the [G] + [C] content?
A 18%
B 32%
C 36%
D 64% +
2. When sunlight is on the chloroplast, pH is lowest in the
A stroma
B cytosol
C space enclosed by the thylakoid membranes +
D space enclosed by the inner and outer membranes
3. Red algae differ from the green algae and brown algae in having:
A no chlorophyll a
B no differentiated cells
C no phycocyanin within their cells
D no flagellated stages in their life cycles +









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