True or False? Nucleosomes consist of DNA wrapped twice around a group of proteins called histones.核小体是由dna包裹在一组叫做组蛋白的蛋白质上的DNA组成的。
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The nucleolus is the site of:核仁是以下几个位点：
A. ) assembly of rough endoplasmic reticulum.
B. ) assembly of rRNA and proteins to form the small and large ribosomal subunits.
C. ) euchromatin in the nucleus.
D. ) heterochromatin in the nucleus.
E. ) Answers (a) and (b) are correct.
True or False? Chromatin consists of DNA and RNA.染色质由DNA和RNA组成。
A. TRUE
B. FALSE
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.
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