The creation of a stop codon in the middle of a coding sequence<br/>within the gene is a:() A: missense<br/>mutation; B: frameshift<br/>mutation; C: nonsense<br/>mutation; D: point<br/>mutation; E: silent<br/>mutation.

名词解释：reverse mutation

突变热点(hot spots of mutation)

突变热点 (hot spots of mutation):

Amino acid sequence of the encoded protein is not changed in A: Silent mutation B: Acceptable mis-sense mutation C: Both (A) and (B) D: None of these

条件致死突变（conditional lethal mutation)

The anti-UV mutation of microorganisms must be induced by ultraviolet rays

The anti-UV mutation of microorganisms must be induced by ultraviolet rays A: 正确 B: 错误

The<br/>anti-UV mutation of microorganisms must be induced by ultraviolet<br/>rays.(<br/>)

Cancer is the result of__________ the genes responsible. A: mutation B: heredity C: sponso D: attendant