福师11春学期《分子生物学》在线作业二（Fushi 11 spring semester molecular biology online assignment 2）.doc
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福师11春学期《分子生物学》在线作业二（Fushi 11 spring semester molecular biology online assignment 2）
Fushi 11 spring semester molecular biology online assignment 2
One, single choice
1. Copia components: ()
A. There are about 20,000 copies in the drosophla genome;
B. series arrangement;
C. Two cases are directional repetition;
Not being transcribed;
E. The env gene of retrovirus is homologous
Correct answer: C
2. What happens to the host chromosome at the anti-retroviral integration site? (a)
A. 4-6 nucleotides removed;
B. 4-6 nucleotides were replicated on one side and removed on the other side;
C. 4 -- 6 nucleotides were copied on each side of the integration;
D. two nucleotides were removed from the right;
E. Two nucleotides were removed from the left
Correct answer: C
The following statements are incorrect: ()
A. There are 20 different passwords that represent the genetic code;
B. Tryptophan and methionine have only one codon;
C. each nucleotide triplets encodes an amino acid;
D. Different codons may encode the same amino acid;
E. the third digit of codon is variable
Correct answer: A
4. In ooligosaccharides, the glycine directly linked to polypeptides is ()
A. mannose;
B. N - acetylglucosamine;
C. C - galactose or n-acetylglucosamine;
D. Galactose or n-acetylglucosamine;
E. glucose
Correct answer: C
5. Which of the following can explain why some genes are not always active when their transcription factors exist? (a)
A. Adjacent sequences of transcription factor binding sites;
B. Binding of other proteins;
C. The chromatin structure state of the binding site of transcription factors;
D. Lack of total activation protein;
E. all of the above
Correct answer: E
How big is a typical chloroplast genome? (a)
A. 1.5 KB;
B. 15 KB;
C. 15 KB;
D. 1500 KB
Correct answer: C
How many times does the DNA compress in 10nm? (a)
A. 6 times;
B. 10 times;
C. 40 times;
D. 240 times;
E. 1000 times;
F. 10000 times
Correct answer: A
How many times does DNA compress in the chromatin region of chromosomes?
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