B3 - DNA Structure And Genetics

Question 1

Which base does adenine pair with?

Answer 1

Thymine

Question 2

What is the shape of DNA?

Answer 2

Double helix

Question 3

What are the base units of DNA called?

Answer 3

Nucleotides

Question 4

Other than the bases what else does DNA consist of?

Answer 4

A pentose sugar and a phosphate group

Question 5

Which base does cytosine pair with?

Answer 5

Guanine

Question 6

Where are chromosomes found in humans?

Answer 6

In the nucleus of a cell

Question 7

What does DNA stand for?

Answer 7

Deoxyribonucleic acid

Question 8

How are the 2 strands of DNA held together?

Answer 8

Hydrogen bonds

Question 9

How many chromosomes do humans have in each cell (apart from gametes)?

Answer 9

46

Question 10

The base sequence determines the amino acid sequence in a _______

Answer 10

Protein

Question 11

What is an allele?

Answer 11

Different versions of a gene

Question 12

Recessive alleles are expressed when …..

Answer 12

Two of the alleles are present

Question 13

A small section of DNA is called ….

Answer 13

A gene

Question 14

Dominant alleles are …

Answer 14

Always expressed

Question 15

What is a gamete?

Answer 15

Sex cells

Question 16

Homozygous meaning

Answer 16

Two of the same allele

Question 17

Female sex chromosomes

Answer 17

XX

Question 18

What is the genome?

Answer 18

The entire set of genetic material of an organism

Question 19

What phenotype is produced from an XY genotype?

Answer 19

Male

Question 20

In asexual reproduction how many parents are required?

Answer 20

1