True or False? Chromatin consists of DNA and RNA.染色质由DNA和RNA组成。
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Which of the following statements about the nuclear membrane is incorrect?下列关于核膜的陈述是不正确的？
A. It is a double membrane.
B. The outer membrane is continuous with the rough endoplasmic reticulum.
C. Nuclear pores extend through the nuclear envelope.
D. The outer membrane is continuous with the smooth endoplasmic reticulum.
E. It separates the nucleus from the cytoplasm.
Which of the following cells is multinucleated (has more than one nucleus)?下面哪个细胞是multinucleated(有一个以上的核)？
A. Red blood cell.
B. Osteoclast.
C. Fibroblast.
D. Cardiac muscle cell.
E. White blood cell.
Synthesis of lipids takes place at the:脂类的合成发生在：
A. rough endoplasmic reticulum (RER).
B. ribosomes.
C. Golgi apparatus.
D. mitochondria.
E. smooth endoplasmic reticulum (SER).
The organelle that modifies proteins produced elsewhere is the:在其他地方产生的蛋白质的细胞器是：
A. Golgi apparatus.
B. smooth endoplasmic reticulum (SER).
C. peroxisome.
D. mitochondria.
E. rough endoplasmic reticulum (RER).
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