21) What is synthesized during transcription? 22. Which nucleotides base pair in DNA, which nucleotides base pair in RNA? 23. Portions of the eukaryotic mRNA molecule that do not code for protein and must be excised prior to translation are called what? 24. What are exons? Introns? 25. Give an example of a bacterium that exhibits a visible phenotypic expression. Include the correct genus and species of the microbe and the phenotype it expresses. 26. What is proof reading 27. Where does the energy required for DNA replication come from? 28. How many amino acids are coded for in the genetic code? 29. AUG is what in the genetic code. It codes for what 30. What are the 3 stop codons?

21 . mRNA from the DNA is synthesised during transcription.

22 . Nucleotide base pair in DNA

Adenine , Thymine , Cytosine and Guanine

Nucleotide base pair in RNA

Uracil, Thymine , Cytosine and Guanine

23 . the sequence of mRNA which do not code for any proteins are called Introns.

24 . Exons:

The part of messenger RNA which codes for the proteins are exons.

Introns:

The non-coding part of the mRNA is introns.

25 . Bacillus anthracis shows the rod shaped phenotype. Belongs to genus Bacillus and specie Bacillus anthracis.

26 . During the replication of the DNA, the polymerase enzyme using its (3' to 5') exonuclease activity, re-check the sequence of nucleotides known as the process proof reading.

27 . The energy comes from breaking down phosphate bond in the upcoming nucleotides. When phosphate bond breaks, releases energy just like ATP. In the start a little energy in the form of ATP is required but then it can give energy to itself.

28 . 20 amino acids are coded for in the genetic code.

29 . AUG is the start codon and code for methionine.

30 . UGA, UAA and UAG are three stop codons.