(d)++Making+proteins

Complete Biology: pages 192-3 ( Section 11.3 ).
 * __Making proteins __**

(14) What is a triplet?

A triplet is a ‘code word’, which are a series of coded instructions, on the DNA. Each code word corresponds to a single amino acid and a protein.

(15) What does each triplet code for?

Each triplet codes for the synthesis of proteins.

(16) Can DNA leave the nucleus?

The DNA cannot leave the nucleus, but it can make a copy of the DNA called RNA which __can__.

(17) Complete the following:

The message on the DNA is copied onto messenger RNA ( Ribonucleic Acid ).

Once made the mRNA leaves the nucleus and goes to a ribosome in the cytoplasm

Inside the ribosomes the message on the mRNA is read and a protein is built by linking amino acids.

<span style="color: #333333; font-family: 'Arial','sans-serif'; font-size: 10.5pt;">(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="color: #333333; font-family: 'Arial','sans-serif'; font-size: 10.5pt; line-height: 115%;">(19) How fast can this process occur?

<span style="color: #333333; font-family: 'Arial','sans-serif'; font-size: 10.5pt; line-height: 115%;">Very rapidly, it only takes approximately 10 seconds for a ribosome to build up a molecule of the protein haemoglobin, which gives red blood cells the characteristic of oxygen transport.