SEQ CHAPTER \h \r 1Year 12 Biology - IB Standard and Higher level

PROTEIN SYNTHESIS

Complete these questions on paper, including the flow chart.

Questions to see whether you understand the main themes:

Question 1If Adenine, Cytosine, Guanine and Thymine are represented by their initial letters (A, C, G & T), which one of the following arithmetic statements is true about the DNA molecule?

a)A + T = 1

b)A = C

c)AT = CG

C + G

T G

Now explain your answer.

Question 2

What is a TRIPLET code? Explain why is it a triplet and not a singlet or a doublet?Question 3

Starting with the information carried on the DNA and finishing with a newly synthesised polypeptide chain, draw a simple flow-chart, showing all the stages. Include the following:

DNA

TRANSLATION

ATP HYDROLYSIS (ie, production of energy)

tRNA

NUCLEUS

CYTOPLASM

TRANSCRIPTION

RIBOSOME

AMINO ACIDS

mRNA

RNA POLYMERASE

POLYPEPTIDE John Osborne, May 2015