在“基因与基因病”一节所引用的“What exactly is a gene”这一科普动画中，描述不够准确的有（ ）。
A: A. Genes make proteins.
B: A. A gene is a special stretch of DNA that codes for something.
C: A. Some genes are small, others are well over a million.
D: A. Each one of our cells contains 46 strands of DNA.
A: A. Genes make proteins.
B: A. A gene is a special stretch of DNA that codes for something.
C: A. Some genes are small, others are well over a million.
D: A. Each one of our cells contains 46 strands of DNA.
A,B,D
举一反三
- 关于“基因”一章引用文本“What exactly is a gene”这一科普动画中，描述不够准确的有 A: Genes make proteins. B: A gene is a special stretch of DNA. C: Many creatures share some of the same genes. D: Each one of our cells contains 46 strands of DNA.
- Some genes can be expressed in different ways to generate multiple gene products from a single segment of DNA.
- 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 human genome contains nearly 21,000 protein-coding genes, and these genes make up only about 2 percent of the genome. In another word, 98 percent of the genomes are non-protein-coding DNA, what some people call () DNA. A: the invalid B: the mismatched C: the junk D: the inactivated
- Reporter genes can be used to indicate not only the amount of gene expression, but also the sites of the expressed proteins.
内容
- 0
A complete set of genes of a given species<br/>called ( ) A: genome B: gene C: DNA D: chromosome cDNA
- 1
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
- 2
The observation that some genes are mosaics of other genes can be explained by ______. A: evolution B: drift C: exon shuffling D: gene duplication E: pseudogenes
- 3
Among the following genes, ( ) is the housekeeping gene. A: Ribosomal protein gene B: Hemoglobin gene C: Insulin protein gene D: Ovalbumin gene
- 4
Happiness is _________.( ) A: genetic B: genes C: genetics D: gene