Biological molecules

Question 1

What is transcription?

Answer 1

• The process where the information from a strand in DNA is copied into a new mRNA
• The mRNA is built up by complementary base pairing and it uses DNQA as a template
• The process of transcribing the DNA code into another code such as mRNA

Question 2

What is the primary structure of a protein?

Answer 2

• A sequence of amino acids

Question 3

What is the secondary structure of a protein?

Answer 3

• Hydrogen bonds are formed and the polypeptide chain gets twisted to a alpha helix or a beta pleated sheet

Question 4

What is the tertiary structure of a protein?

Answer 4

• This is where the helix is twisted and folded to give a compact and complex 3D structure
• Contains ionic bonds, disulphide bonds and hydrogen bonds

Question 5

What is the quaternary structure of a protein?

Answer 5

• Multiple polypeptide chains join together

Question 6

How does VEGF replicate?

Answer 6

• Helicase unwinds the DNA which breaks the hydrogen bonds
• RNA polymerase attaches to the unwinded strand of DNA
• RNA nucleotide are added
• Complementary base pairs are added

Question 7

What is the difference between DNA and RNA?

Answer 7

• DNA is double stranded
• RNA is single stranded
• DNA has bases A,T,C,G
• RNA has bases A,U,C,G