举一反三
- The base substitution in the coding region of the gene must lead to the change of protein structure A: 正确 B: 错误
- What about inserting a base into the coding region of a gene？ A: No impact B: It will change all amino acid sequences of the protein downstream of the insertion point C: Depending on the insertion point, it may have different effects on the protein D: An amino acid will be inserted into the protein sequence E: Three amino acids will be inserted into the protein sequence
- What<br/>about inserting a base into the coding region of a gene?() A: No<br/>impact B: It<br/>will change all amino acid sequences of the protein downstream of the<br/>insertion point C: Depending<br/>on the insertion point, it may have different effects on the protein D: An<br/>amino acid will be inserted into the protein sequence E: Three<br/>amino acids will be inserted into the protein sequence
- Operator: ( ) A: An operator is a DNA region that is working with promoter for genes to express. B: An operator is a DNA region at 5’ of a gene for a repressor to bind to prevent gene expression. C: An operator is a repressor protein to help genes to express. D: An operator is a repressor protein to inhibit genes to express.
- The operator is A: Another name for the terminator of a gene B: A DNA site bound by repressor proteins C: A protein that coordinates gene expression D: A part in the leader region of mRNA
内容
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Deletion of 4 bases from the coding region of a gene will give _______. A: nonsense mutations B: missense mutations C: silent mutations D: frameshift mutations
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Among the following genes, ( ) is the housekeeping gene. A: Ribosomal protein gene B: Hemoglobin gene C: Insulin protein gene D: Ovalbumin gene
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opposite to that of the price change, ( ) just like the sultsky substitution effect A: Hicks substitution effect must be in a direction B: SARP is both a necessary and a sufficient condition ( Unlike WARP) for what? C: Hicks substitution effect D: The substitution effect is
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β-turns in protein molecules belong to the protein's hierarchical structure? A: Primary structure B: Secondary structure C: Tertiary structure D: Side chain conformation
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A gene knock-in (or knock-in) refers to a genetic engineering method that involves the one-for-one substitution of DNA sequence information in a genetic locus or the insertion of sequence information not found within the locus. A gene knock-in therefore can be seen as a gain of function mutation and a gene knockout a loss of function mutation, but a gene knock-in may also involve the substitution of a functional gene locus for a mutant phenotype that results in some loss of function.