DNA

Question 1

What are the 4 bases of dna?

Answer 1

A - adenine
G - guanine A-T
C - cytosine C-G
T - thymine

Question 2

What is the shape of dna and what holds them together?

Answer 2

Dna is in the shape of a double helix and they’re held together by weak hydrogen bonds.

Question 3

What are chromosomes?

Answer 3

Are long coiled up molecules of dna. Found in nucleus.

Question 4

What are genes?

Answer 4

It is a section of dna on a chromosome that codes for a particular protein , the sequence of bases determines what protein

Question 5

How do you extract dna from fruit cells?

Answer 5

1. Crush strawberries an put in a beaker with salt and detergent.
2. Filter mixture to receive insoluble bits
3. Add some ice cold alcohol
4. The dna will come out of the solution , (white precipitate)
5. Take it out using a glass rod

Question 6

What is the point of detergent,salt and ice cold alcohol?

Answer 6

Detergent - breaks down cell membrane and releases the DNA
Salt - makes DNA stick together
Ice cold alcohol - makes the solution insoluble