举一反三
- The expression products of all genes are proteins.
- Some genes can be expressed in different ways to generate multiple gene products from a single segment of DNA.
- Eukaryotic genes have additional steps and more regulatory binding sites controlled by more regulatory proteins. Besides, nucleosomes and their modifiers influence genes expression.
- which of following do not belong to pathogenic variations of the endogenous genes ( ) A: gene amplification B: abnormal gene expression C: invasion of the foreign genes D: gene arrangement E: point mutation
- Which of the following methods is not used by cells to regulate the amount of a protein in the cell A: Genes can be transcribed into mRNA with different efficiencies. B: Many ribosomes can bind to a single mRNA molecule. C: Proteins can be tagged with ubiquitin, marking them for degradation. D: Nuclear pore complexes can regulate the speed at which newly synthesized proteins are exported from the nucleus into the cytoplasm.
内容
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Which of the following is correct about the gene chip? A: It can simultaneously analyze the variation of multiple genes. B: Microarray sample density is very small. C: It can be used to study the expression of multiple genes. D: It is mainly used for the analysis of single gene structural variation.
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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
- 2
Depending on the culture, a smile can indicate joy and amusement, it can also indicate embarrassment.
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Fill in the blank with the expression given below. Change the form where necessary. Each expression can be used only once.9. Their success was due _____ to their well-conceived plan.
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Constitutive genes are() A: genes that<br/>are expressed all the time. B: genes that<br/>are not expressed at all the time. C: genes that<br/>are expressed when needed. D: genes that<br/>are repressed.