SB3c DNA

Question 1

adenine

Answer 1

One of four bases found in DNA. Often written as A.

Question 2

base (in DNA)

Answer 2

Four substances that help make up DNA, often shown by the letters A, C, G and T. Pairs of bases form ‘links’ between two ‘spines’ formed of phosphate groups and a type of sugar.

Question 3

chromosome

Answer 3

A structure found in the nuclei of cells. Each chromosome contains one enormously long DNA molecule packed up with proteins.

Question 4

complementary base pair

Answer 4

Two DNA bases that fit into each other and link by hydrogen bonds. There are two types of complementary base pair: A linking with T, and C linking with G.

Question 5

cytosine

Answer 5

One of four bases found in DNA. Often written as C.

Question 6

DNA

Answer 6

Deoxyribonucleic acid. A polymer made of sugar and phosphate groups joined to bases. One molecule of DNA is found in each chromosome.

Question 7

Double helix

Answer 7

Two helices joined together.

Question 8

Gene

Answer 8

Section of the long strand of DNA found in a chromosome, which often contains instructions for a protein.

Question 9

Guanine

Answer 9

One of four bases found in DNA. Often written as G.

Question 10

Hydrogen bond

Answer 10

Weak force of attraction caused by differences in the electrical charge on different parts of different molecules.

Question 11

Thymine

Answer 11

One of four bases found in DNA. Often written as T.