N5S3 - DNA Structure - 1.6

Question 1

Describe the structure of DNA

Answer 1

Double stranded helix held together by complementary base pairs

Question 2

Define the purpose of DNA

Answer 2

DNA carries the genetic information for making proteins

Question 3

Where is DNA stored?

Answer 3

Inside the nucleus of the cell in chromosomes

Question 4

State the four bases and their complementary base pairs

Answer 4

BASES
* Adenine
* Thymime
* Guanine
* Cytosine

COMPLEMENTARY BASES
* Adenine always pairs with Thymine
* Guanine always pairs with Cytosine

Question 5

Define the genetic code

Answer 5

It is the sequence of bases along a strand.

Question 6

What does the base sequence determine?

Answer 6

The amino acid sequence in proteins.

Question 7

Define a gene

Answer 7

A gene is a section of DNA that codes for a protein

Question 8

What are the two strands in DNA held together by?

Answer 8

Weak hydrogen bonds

Question 9

What is a chromosome?

Answer 9

A chromosome is DNA that is stored as long thin threads.

Question 10

What is the name of the hundreds of repeating units that make up DNA strands?

Answer 10

Nucleotide bases

Question 11

How many pairs of chromosomes do humans have?

Answer 11

23 (46 in total)