Chromosomes, Genes And DNA

Question 1

What is the shape of DNA?

Answer 1

3D double helix

Question 2

What is DNA consisted of?

Answer 2

Deoxyribose sugars, phosphate groups and bases ( A,T,G,C )

These together are called a nucleotide

Question 3

What is base pairing?

Answer 3

This is the way that Adenine must combine with Thymine and Cytosine must combine with Guanine.

Question 4

How many bases code for an amino acid?

Answer 4

Three, called a base triplet.

Question 5

What did Erwin Chargaff do?

Answer 5

He used chemical analysis to determine the base pairing rule ( A=T, G=C )

Question 6

What did Rosalind Franklin and Maurice Wilkins do?

Answer 6

Used X-Ray diffraction to determine the overall DNA shape and the position of the phosphate group.

Question 7

What did James Watson and Francis Crick do?

Answer 7

Used modelling to develop a 3D model of DNA, illustrating DNA as a double helix and the arrangement of bases.

Question 8

What does DNA stand for?

Answer 8

Deoxyribo Nucleic Acid

Question 9

What is a gene?

Answer 9

Short strand of DNA located on a chromosome which codes for a particular characteristic in a species.

Question 10

What is a chromosome?

Answer 10

A long strand of DNA located on the nucleus.