本题目来源于试卷: Form and Function B.4 Organelles & Compartmentalization，类别为 IB生物学
[单选题]
What is the fate of a ribosome aftejok32 j95xf6sox0b x,zar-hwr te(j. oxqy,;/a6q yx2rhg ,nnjranslation is completed?
A. It twists and folds proteins into a tertiary structure suited to perform a specific function
B. It binds to another amino acid
C. The large subunit and the small subunit of the ribosome separate to be reused again later
D. It is destroyed by a lysosome
参考答案: C
本题详细解析:
The polypeptide synthesised by a ribosome is released and then folded into a tertiary three-dimensional shape by chaperone proteins, not ribosomes (Choice A). The tRNA molecules (NOT ribosomes) carry amino acids to the ribosome. After one tRNA molecule transfers an amino acid, it gets released and then binds to another amino acid (Choice B). This step occurs before translation is finished and is repeated again and again until a stop codon is reached. After translation is complete, the large and small ribosomal subunits dissociate from the mRNA strand and can be used again (Choice C). Lysosomes are organelles that digest old and damaged parts of the cell (Choice D). Ribosomes, however, are not destroyed after just one use but rather are reused over and over again.
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