1.2.9 DNA structure

Question 1

What is the cause of cystic fibrosis?

Answer 1

Cystic fibrosis is caused by a mutation in the DNA that carries instructions for making the CFTR protein

Question 2

Where is DNA found?

Answer 2

DNA is found in every cell nucleus

Question 3

What is a gene?

Answer 3

A gene is a sequence of bases on a DNA molecule

Question 4

What is a genome?

Answer 4

The genes of an individual are known as the genome of the individual

Question 5

What is DNA made up of?

Answer 5

DNA is one type of nucleic acid, made up of nucleotides

Question 6

What three things does a mononucleotide contain?

Answer 6

• Deoxyribise (5-carbon sugar)- A phosphate group- An organic base (containing nitrogen

Question 7

How are mononucleotides held together?

Answer 7

Mononucleotides are linked together by a condensation reaction between a sugar and a phosphate

Question 8

What are the four bases of DNA?

Answer 8

• Adenine
• Cytosine
• Guanine
• Thymine

Question 9

What is the positioning of the two DNA stands?

Answer 9

The two strands of DNA are antiparallel

Question 10

What bond forms between bases, holding the two strands together?

Answer 10

Hydrogen bonds form between bases

Question 11

How many bonds form between T and A

Answer 11

T and A form a double bond

Question 12

How many bonds form between C and G?

Answer 12

G and C form a triple bond