Statement A & D is correct Regulation of lac operon by repressor is referred as negative regulation. In negative regulation, a repressor molecule binds to the operator of an operon and terminates transcription. In positive regulation, an activator interacts with the RNA polymerase in the promoter region to initiate transcription. Human genome contains some 20,000- 25,000 genes billion bases.

Correct Option: A

Statement A & D is correct Regulation of lac operon by repressor is referred as negative regulation. In negative regulation, a repressor molecule binds to the operator of an operon and terminates transcription. In positive regulation, an activator interacts with the RNA polymerase in the promoter region to initiate transcription. Human genome contains some 20,000- 25,000 genes billion bases.

The sample of a portion of DNA strand shown in the figure is palindromic sequence of base pairs.

Correct Option: D

The sample of a portion of DNA strand shown in the figure is palindromic sequence of base pairs.

Genetic code is non ambiguous. There is no ambiguity for a particular codon. A particular codon will always code for the same amino acid, where ever it is found.

Correct Option: B

Genetic code is non ambiguous. There is no ambiguity for a particular codon. A particular codon will always code for the same amino acid, where ever it is found.

The genetic code consists of 64 triplets of nucleotides. These triplets are called codons. With three exceptions, each codon encodes for one of the 20 amino acids used in the synthesis of proteins. That produces some redundancy in the code. Most of the amino acids being encoded by more than one codon. The genetic code can be expressed as either RNA codons or DNA codons.

Correct Option: D

The genetic code consists of 64 triplets of nucleotides. These triplets are called codons. With three exceptions, each codon encodes for one of the 20 amino acids used in the synthesis of proteins. That produces some redundancy in the code. Most of the amino acids being encoded by more than one codon. The genetic code can be expressed as either RNA codons or DNA codons.

UAA is the stop codon. Therefore at 25th amino acid the synthesis of polypeptide stops. So, a polypeptide of 24 Amino acid is formed.

Correct Option: B

UAA is the stop codon. Therefore at 25th amino acid the synthesis of polypeptide stops. So, a polypeptide of 24 Amino acid is formed.