(d)++Making+proteins

(d) Making Proteins (Q 14-19) **__Making proteins __** Complete Biology: pages 192-3 ( Section 11.3 ).

 (14) What is a triplet? A DNA strand carries instruction in the form of three-letter ‘code words’ called triplet

(15) What does each triplet code for? Triplet code of GAT- This triplet instructs the cell to build one particular amino acid into a protein Triplet code of AGT- This triplet instructs the cell to build a different amino acid into the protein Triplet code of TCA- This triplet instructs the cell to build another different amino acid into the protein Triplet code of GGC- This triplet instructs the cell to build another different amino acid into the protein The four different bases in DNA can be arranged to different triplets to code for all 20 amino acids that can be found in a cell. GAT, AGT, TCA and GGC are DNAs.  (16) Can DNA leave the nucleus? DNA cant leave the nucleus, only MRNA can leave the nucleus.

(17) Complete the following:

The message on the DNA is copied onto …messenger………………. ……RNA……………. (……mRNA……………….).

………mRNA……………. leaves the nucleus and goes to a ……ribosomes ……………….

Inside the ………ribosomes……………. the message on the mRNA is read and a ………translation……………. is built.

(18) Copy the diagram on the top half of page 193 (end of <span style="font-family: 'Arial','sans-serif'; font-size: 10.5pt;">Section 11.3 <span style="color: #333333; font-family: 'Arial','sans-serif'; font-size: 10.5pt;">) <span style="background: white; color: #333333; font-family: 'Calibri','sans-serif'; font-size: 14pt; line-height: 115%; margin: 0in 0in 12pt;">

<span style="background: white; color: #333333; font-family: 'Arial','sans-serif'; font-size: 10.5pt; line-height: normal; margin: 0in 0in 12pt;">(19) How fast can this process occur? <span style="background: white; color: #333333; font-family: 'Arial','sans-serif'; font-size: 10.5pt; line-height: normal; margin: 0in 0in 12pt;"> <span style="color: #333333; font-family: 'Arial','sans-serif'; font-size: 10.5pt;">These processes occurred rapidly as it only takes 10 seconds for a ribosome to build up a molecule of haemoglobin. The protein haemoglobin gives the characteristic of oxygen transport to red blood cells.