AQA AS Biology 2.8 DNA

Question 1 of 24

1

DNA is the chemical that determines inherited characteristics and it contains vast amounts of information in the form of genetic code

Select one of the following:

True
False

Explanation

Question 2 of 24

1

What is the structure of a DNA molecule?

Select one of the following:

helical
double helix
pleated sheet

Explanation

Question 3 of 24

1

What three components is a nucleotide of DNA made up of?

Select one or more of the following:

a variable group
a phosphate group
a deoxyribose sugar
an organic base (C, T, A or G)
a hydrocarbon

Explanation

Question 4 of 24

1

The single ring bases are?

Select one or more of the following:

C
G
A
T

Explanation

Question 5 of 24

1

The double ring bases are?

Select one or more of the following:

C
G
A
T

Explanation

Question 6 of 24

1

DNA is made up of two strands of polynucleotides. How do the nucleotides join to become polynucleotides?

Select one of the following:

Hydrogen bonds
Condensation Reaction between phosphate group of one nucleotide and deoxyribose of another.
Polar attraction

Explanation

Question 7 of 24

1

Which base does cytosine pair with?

Select one or more of the following:

adenine
thymine
guanine

Explanation

Question 8 of 24

1

What base does thymine pair with?

Select one or more of the following:

adenine?
guanine?
cytosine?

Explanation

Question 9 of 24

1

The organic bases form the structural backbone of DNA

Select one of the following:

True
False

Explanation

Question 10 of 24

1

What is the function of DNA?

Select one of the following:

To pass genetic information from cell to cell and generation to generation.
To provide energy for the cell.
To make organic bases.

Explanation

Question 11 of 24

1

How is the DNA molecule adapted to carry out its functions? (4 points)

Select one or more of the following:

It is very stable and can pass from generation to generation without changing.
It is flexible so can be easily changed.
It's two strands are only joined with H bonds which allow them to separate for DNA replication.
The two strands are joined with H bonds that are strong and prevent the strands from separating.
The molecule is extremely large so carries an immense amount of genetic information.
The structural backbone protects the genetic information from corruption.
The molecule is very small so lots of them can fit in a small space.

Explanation

Question 12 of 24

1

What is a gene?

Select one of the following:

A sequence of DNA bases that determines a polypeptide (a sequence of amino acids).
A molecule that contains all the genetic information of a cell.
A substance made up of DNA

Explanation

Question 13 of 24

1

What are introns?

Select one of the following:

Sections of DNA that don't code for amino acids.
Amino acids.
Three bases that code for an amino acid.

Explanation

Question 14 of 24

1

The triplet code can be read in either direction of the DNA strand

Select one of the following:

True
False

Explanation

Question 15 of 24

1

The start of a sequence of the triplet code is always the same: the amino acid 'methionine'.

Select one of the following:

True
False

Explanation

Question 16 of 24

1

Stop codes are triplet codes that don't code for an amino acid, but the end of a polypeptide chain.

Select one of the following:

True
False

Explanation

Question 17 of 24

1

The triplet code is only specific to humans.

Select one of the following:

True
False

Explanation

Question 18 of 24

1

Prokaryotic cells don't have chromosomes as their DNA molecules are smaller and not associated with protein molecules

Select one of the following:

True
False

Explanation

Question 19 of 24

1

Chromosomes are visible all the time.

Select one of the following:

True
False

Explanation

Question 20 of 24

1

The DNA helix is wound around proteins to hold it in position.

Select one of the following:

True
False

Explanation

Question 21 of 24

1

A chromosome contains a single molecule of DNA.

Select one of the following:

True
False

Explanation

Question 22 of 24

1

How many chromosomes do humans have?

Select one of the following:

78
46
23
48

Explanation

Question 23 of 24

1

A homologous pair of chromosomes determine the same genetic characteristics.

Select one of the following:

True
False

Explanation

Question 24 of 24

1

What are different forms of a gene called?

Select one or more of the following:

alleles
chromosomes
haploid cells

	Created by Georgia Knight about 9 years ago

A Levels A Levels (Biology) Quiz on AQA AS Biology 2.8 DNA, created by Georgia Knight on 25/02/2015.

AQA AS Biology 2.8 DNA

Question 1 of 24

DNA is the chemical that determines inherited characteristics and it contains vast amounts of information in the form of genetic code

Select one of the following:

Explanation

Question 2 of 24

What is the structure of a DNA molecule?

Select one of the following:

Explanation

Question 3 of 24

What three components is a nucleotide of DNA made up of?

Select one or more of the following:

Explanation

Question 4 of 24

The single ring bases are?

Select one or more of the following:

Explanation

Question 5 of 24

The double ring bases are?

Select one or more of the following:

Explanation

Question 6 of 24

DNA is made up of two strands of polynucleotides. How do the nucleotides join to become polynucleotides?

Select one of the following:

Explanation

Question 7 of 24

Which base does cytosine pair with?

Select one or more of the following:

Explanation

Question 8 of 24

What base does thymine pair with?

Select one or more of the following:

Explanation

Question 9 of 24

The organic bases form the structural backbone of DNA

Select one of the following:

Explanation

Question 10 of 24

What is the function of DNA?

Select one of the following:

Explanation

Question 11 of 24

How is the DNA molecule adapted to carry out its functions? (4 points)

Select one or more of the following:

Explanation

Question 12 of 24

What is a gene?

Select one of the following:

Explanation

Question 13 of 24

What are introns?

Select one of the following:

Explanation

Question 14 of 24

The triplet code can be read in either direction of the DNA strand

Select one of the following:

Explanation

Question 15 of 24

The start of a sequence of the triplet code is always the same: the amino acid 'methionine'.

Select one of the following:

Explanation

Question 16 of 24

Stop codes are triplet codes that don't code for an amino acid, but the end of a polypeptide chain.

Select one of the following:

Explanation

Question 17 of 24

The triplet code is only specific to humans.

Select one of the following:

Explanation

Question 18 of 24

Prokaryotic cells don't have chromosomes as their DNA molecules are smaller and not associated with protein molecules

Select one of the following:

Explanation

Question 19 of 24

Chromosomes are visible all the time.

Select one of the following:

Explanation

Question 20 of 24

The DNA helix is wound around proteins to hold it in position.