Question

A base substitution that changed a DNA sequence of TGT to TGG would cause a __________ mutation.

silent

nonsense

frameshift

missense

Bacteria that can naturally take up free DNA and recombine it into their chromosome are called ______________.

competent

F+ cells

transduced

transformed

Answer 1

–Missense mutation.

Missense mutation is a point mutation where a base pair is substituted by a another which codes for a new amino acid .

Here TGT codes for cysteine and TGG codes for tryptophan , so it changes the amino acid sequence.

– transformed.

Transformation is a method of horizontal gene transfer where bacteria takes up extrachromosomal genetic material and incorporates it into its own genome. So such bacteria get transformed.

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