Question

QUESTION 22 To say the genetic code is triplet means _______ 1. its made of three sugars 2. its made of three bases 3. its made of three phosphates 4. its made of the nucleotides 5. all of the above 6. non of the above 2.5 points

QUESTION 23 During transcription, the enzyme __________ attaches to a region called a promoter 1. DNA polymerase 2. RNA polymerase 3. Ligase 4. helicase 5. non of the above

Answer 1

1. Made up of three bases

The information present in the genetic code is read in the groups of three nitrogenous bases. One group is called as codon.

One codon codess for one amino acid. This is called as specificity of the genetic code.

But there are some amino acid which have more than one codons. This is called as degeneracy of the genetic code.

The genetic code is read in continuous manner without any punctuation marks.

2. RNA polymerase

Transcription is the process of formation of RNA using DNA as a template. It takes place in nucleus of eukaryotes and cytoplasm of prokaryotes.

It uses enzyme called as DNA dependent RNA polymerase. It is responsible for the polymerization of growing RNA molecule throughout the process.

Ligase is the enzyme which is responsible for the formation of phosphodiester bond between adjacent DNA molecules.

DNA polymerase is responsible for polymerization of DNA during DNA replication.

Helicase is responsible for unwinding of double stranded DNA into single stranded molecules during DNA replication.

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