Bacterial ribosomes contain about 65% rRNA and 35% protein; they have a diameter of about 18 nm and are composed of two unequal subunits of ___________ and a combined sedimentation coefficient of 70S.
A: 20S and 50S
B: 30S and 40S
C: 30S and 50S
D: 30S and 60S
A: 20S and 50S
B: 30S and 40S
C: 30S and 50S
D: 30S and 60S
举一反三
- 下列纬线中，按由南向北排列顺序正确的是（） A: 30°S、15°S、15°N、30°N B: 30°N、15°N、15°S、30°S C: 10°S、20°S、30°S、40°S D: 40°N、30°N、20°N、10°N
- 下面代码段的执行结果是 int i, s = 0 ; int a[ ] = { 10 , 20 , 30 , 40 , 50 , 60 , 70 , 80 , 90 }; for ( i = 0 ; i < a.length ; i ++ ) if ( a[i]%3 = = 0 ) s += a[i] ; System.out.println("s="+s);
- Which of the following best describes women’s feeling about their life in their 30s?
- 脉搏节律异常时测量时间为 A: 30s B: 15s C: 60s D: 10s E: 50 s
- 机械通气患者每次吸痰时间以( )为宜 A: 10 s B: 15 s C: 20 s D: 30 s E: 60 s