Unit 1.3

Question 1

What is mRNA

Answer 1

messenger RNA is a molecule which carries a complementary copy of the genetic code from the DNA in the nucleus to a ribosome where the protein is assembled from amino acids

Question 2

Describe stage 1 of protein synthesis

Answer 2

The double helix DNA molecule unwinds and unzips along a gene

Question 3

Describe stage 2 of protein synthesis

Answer 3

A complementary copy of the DNA code is made by mRNA

Question 4

Describe stage 3 of protein synthesis

Answer 4

The mRNA separates from the DNA and leaves the nucleus through tiny holes in the nuclear membrane

Question 5

Describe stage 4 of protein synthesis

Answer 5

The ribosome reads the mRNA strand and uses the order of the bases to produce a protein by joining amino acids together

Question 6

What does DNA do

Answer 6

DNA carries the genetic information needed for making proteins

Question 7

What are the 4 bases

Answer 7

Adenine - Thymine
Cytosine - Guanine

Question 8

What are the base pairing rules

Answer 8

A always pairs with T and C always pairs with G

Question 9

What is a gene

Answer 9

A gene is a section of DNA which codes for a protein