真核生物核糖体大小亚基分别为(  )。A.70S+30S B.80S+50S

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问题 真核生物核糖体大小亚基分别为(  )。A.70S+30SB.80S+50SC.60S+40SD.50S+30S

选项 A.70S+30S
B.80S+50S
C.60S+40S
D.50S+30S

答案 C

解析 核糖体由大、小两个亚基组成。由于沉降系数不同,核糖体又分为70S型和80S型两种。70S型核糖体主要存在于原核细胞的细胞质基质中,其小亚基单位为30S,大亚基单位为50S;80S型核糖体主要存在于真核细胞质中,其小亚基单位为40S,大亚基单位为60S。
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