The structure of DNA | Combined science | Quizalize & Oak National Academy

Starter quiz

The drawing shows a bacterial cell. Which structure (A, B or C) contains the genetic material?

A

B

C ✓
Which is the best definition of a gene?

A large chemical molecule made of smaller groups.

All the DNA of an organism.

A short section of DNA carrying the genetic code for a process or feature. ✓

All the chromosomes in the nucleus.
All organisms have similarities in their DNA. Put these examples in order, starting with the example of two things that have the most similar DNA.

1

⇔

two brothers

2

⇔

a granddaughter and her grandmother

3

⇔

a human being and a chimpanzee

4

⇔

a human being and a lion

5

⇔

a human being and a banana
What do scientists call the sections of DNA in a chromosome that lie between genes?

'non-coding' ✓
True or false? Only genes make up the genome of an organism.

True

False ✓
Which is the best explanation for why the genomes of humans and bananas have similarities?

Humans and bananas are very closely related.

Humans and bananas share many similar features.

Humans and bananas have no similar features.

Humans and bananas have common life processes. ✓

In plant and animal cells, the genome is stored in the ...

'nucleus' ✓
DNA is a nucleic acid polymer. How many nucleic acid strands make up each DNA molecule?

one

two ✓

four

eight
Put these in size order, starting with the smallest.

1

⇔

nucleotide

2

⇔

nucleic acid

3

⇔

DNA molecule

4

⇔

nucleus
The photograph shows a model of part of a DNA molecule. It is made from liquorice and jelly babies. What would improve the model?

Add more than four colours of jelly baby.

Add more than two liquorice sticks.

Twist the model to form a helix. ✓

Bend the model into a square.
Scientists often use models such as the DNA models you have studied. Why?

Models are exact copies of things such as DNA.

Models always contain a lot of details.

Models are always much larger than the things they represent.

Models help to explain things that are difficult to see or understand. ✓
Match the word to its meaning.

DNA

⇔

a polymer made of four nucleotides, which make up the genetic code ✓

polymer

⇔

a chemical made from many smaller chemical groups ✓

nucleic acid

⇔

a polymer made up of nucleotides, an example is DNA ✓

nucleotide

⇔

the building blocks for nucleic acids and DNA ✓

Loading worksheet ...

Loading presentation ...

DNA is living and not necessarily a chemical.

Discussing that DNA is a chemical molecule and showing how it is made up of smaller chemical groups, and then modelling this chemical structure.

Dna - DNA is a nucleic acid polymer made up of four nucleotides, it contains the genetic code in all living organisms.
Nucleic acid - A nucleic acid is a polymer made up of nucleotides, an example is DNA.
Polymer - A polymer is a chemical made up of smaller repeating chemical groups.
Nucleotide - A nucleotide is a chemical group that make up the building blocks of DNA, the four types are coded A, T, C and G.
Double helix - A DNA molecule is made up of two nucleic acid chains that spiral around each other to form a double helix.