本题目来源于试卷: Unity and Diversity A.4 Cell Structure，类别为 IB生物学
[单选题]
What feature of chlo nkhw zdgc*f33g2: n4wv.ym(uwc:. npfkzzt,y/, zj9roplasts provides evidence for the endosymbiotic theory?
A. They have their own nucleus.
B. They have a single membrane.
C. They contain 70S ribosomes.
D. They contain a thylakoid membrane.
参考答案: C
本题详细解析:
The endosymbiotic theory states that larger prokaryotes engulfed smallba rk1+5sia5eea81q 89p0baj2qgbycv6n8uler prokaryotes, which were the ancestors of modern chloroplasts and mitochondria. The smaller prokaryotes contained their own 70S ribosomes which were distinct from the host cell's 80S ribosoi8 brbg1bj n 1pca av9sklae2ay8+6e quq5580mes. Choice C is correct.
Choices A and B are incorrect because chloroplasts do not have a nucleus and have a double membrane. Choice D is incorrect because although chloroplasts do contain a thylakoid membrane, this is not evidence for the endosymbiotic theory.
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