Food Molecular Biology答案2023

第二章测试

1.DNA sequences that are highly enriched in G–C base pairs typically have high melting temperatures. Therefore, PCR amplification is greatly hindered by the presence of G–C-rich regions within the template.（ ）
A:对 B:错
答案:A
2.The lacZ gene can be used to screen bacteria containing recombinant plasmids. A special plasmid carries a copy of the lacZ gene and an ampicillin-resistance gene.（ ）
A:对 B:错 3.We use Lipid mediated gene delivery as example. It uses lipids to cause a cell to absorb exogenous DNA since they are both made of a phospholipid bilayer.（ ）
A:对 B:错 4.When you doing transgenic plant, you could do overexpression, gene knock-down or gene knock out. Overexpression usually refers to an experiment when DNA is added to the cell to force expression of the gene to a much higher than normal level.（ ）
A:错 B:对 5.The technique we use for gene knock down is small interfering RNA (siRNA). Sometimes we call short interfering RNA or silencing RNA, it is a class of single-stranded RNA non-coding RNA molecules, 20-25 base pairs in length, and operating within the RNA interference (RNAi) pathway.（ ）
A:对 B:错