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.
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.
举一反三
- 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.
- Some genes can be expressed in different ways to generate multiple gene products from a single segment of DNA.
- 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
- 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.
- Reporter genes can be used to indicate not only the amount of gene expression, but also the sites of the expressed proteins.