医学遗传学的问题1.Gene is split,alternate with the exons and the int

医学遗传学的问题
1.Gene is split,alternate with the exons and the introns.
A.Exons are the encoding sequences corresponding to the sequence of mRNA and their mutations will influence the formation of proteins.
B.The numbers of exons and introns in a gene are N+1 and N respectively.Exons are variable and introns are conserved.
C.Introns are the non-encoding sequences and the corresponding RNA sequence will be removed from mRNA.Their mutations do not influence the splicing of RNA and affect the production of mRNA
D.Splice site is located in the junction region of intron and exon,where intron always starts at AT and ends at CG.
2.在基因组的间隔序列和内含子等非编码区内,广泛存在着与小卫星DNA相似的一类小重复单位,重复序列为（）,称为微卫星DNA或STR,如(A)n/(T)n、(CA)n/(TG)n、(CT)n、(AG)n等.
A.15~100kb
B.6kb
C.10~60kb
D.5kb
E.170~300kb
3.The presence of genes in the same chromosome is an exampl
A.Linkage
B.Segregations
C.Free assortment
D.Coordination
E.Fusion
4.目前已知人类最大的基因,大约由（）和相应的内含子组成,cDNA全长为11 000bp,编码分子量为427 000的蛋白质,从dystrophin转录形成一条完整的mRNA分子需要16h.
A.80个外显子
B.60个外显子
C.70个外显子
D.40个外显子
E.79个外显子
最好能给出理由.