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【简答题】
如图所示，用一根玻璃针将一个变形虫切成两半，有核的一半能继续生活，无核的一半死亡。如果将一个变形虫的核取出，无核部分能短期生存，但不能繁殖后代。如果在去核后三天，再植入一个细胞核，这个变形虫生活正常。根据上述内容回答问题：无核的变形虫为什么不能生存？
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反馈参考答案：
举一反三
【简答题】The variance is based on the between the value of each observation and the mean, the difference is called a about the mean. In the computation of the variance, the deviations about the mean are .
【简答题】34【多选题】心肌闰盘的细胞连接有
【单选题】For the sampling distribution of sample means, what is the relationship between the population mean and the mean of all possible sample means of size 25?
A.
They are equal.
B.
They are not equal.
C.
They are different by one standard error of the mean.
D.
They are both normally distributed.
【简答题】STP
【简答题】A．breakdown B．breakout C．breakaway D．breakin
【单选题】The mean of the exponential distribution equals the mean of the Poisson distribution only when the former distribution has a mean equal to:
A.
1.0.
B.
0.50.
C.
0.25.
D.
any value smaller than 1.0.
【单选题】That' s international practice. We can' t ( ) it.
A.
break
B.
broken
C.
have broken
D.
breaking
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