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 chloroplasts pmx7qvecn 22l7 ag1 -xcrovides e rqf ut, -0q/f:bxst qgo7kykn sz99*4vidence 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 prokaryote 786wbg+grain5zz g:g fb, :vzs engulfed smaller 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 ribosomes. Choice C is corr ri :5f6z8 v:gw+7bg zbagzgn,ect.
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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