3. The table below shows the DNA base triplets that code for different amino acids. \begin{tabular}{|l|l|} \hline \begin{tabular}{l} Base triplet in \\ DNA template \end{tabular} & \multicolumn{1}{c|}{ Amino acid } \\ \hline GAA & Leu (leucine) \\ \hline GTA & His (histidine) \\ \hline TTT & Lys (lysine) \\ \hline GGG & Pro (proline) \\ \hline CGA & Ala (alanine) \\ \hline ACE & Trp (tryptophan) \\ \hline AAA & Phe (phenylalanine) \\ \hline CCT & Gly (glycine) \\ \hline \end{tabular} The following is a part of a sequence of amino acids that forms a particular protein molecule: GCU CAU cie: \begin{tabular}{|c|c|c|c|c|} \hline Ala & His & Trp & Leu & Lys \\ \hline \end{tabular} 3.1 Name the process by which mRNA is formed from a DNA template. (1) 3.2 How many mRNA codons would be involved in forming the portion of protein showr above? 3.3 Write down the sequence of the first THREE mRNA codons (from left to right) for this portion of the protein. (3) 4. The first 7 triplets of nitrogenous bases that form part of the gene coding for one chain of the haemoglobin protein that makes up red blood corpuscles in humans is shown below. \begin{tabular}{|l|c|c|c|c|c|c|c|} \hline \begin{tabular}{l} DNA \\ TEMPLATE \end{tabular} & CAC & GTG & GAC & TGA & GGA & CTC & CTC \\ \hline \begin{tabular}{l} BASE \\ TRIPLET \\ NUMBER \end{tabular} & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\ \hline \end{tabular} 4.1 How many of the following are coded for in the DNA template sequence above: (a) Nitrogenous bases \( 2 / \) (b) Different types of t-RNA molecules that are required to (1) form the polypeptide from this piece of DNA (1) (1) (c) Amino acids?
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