DNA And RNA

Question 1

What is the structure of DNA

Answer 1

Double helix

Held together by phosphate backbone, sugar (deoxyribose) and 4 bases (A,T, C&G)

Question 2

What is the structure of RNA

Answer 2

Ribose sugar, 4 bases but thymine is replaced by uracil
Short and unstable
Single stranded

Question 3

Name the 4 bases in DNA

Answer 3

adenine
Thymine
Cytosine
Guanine

Question 4

Name the 4 bases in RNA

Answer 4

adenine
Uracil
Cytosine
Guanine

Question 5

What is a gene

Answer 5

Made up of DNA

Basic physical and functional unit of heredity

Question 6

What is a chromosome

Answer 6

Contains all the genetic material of an organism

Question 7

How are chromosomes involved in sex determination

Answer 7

X and Y chromosomes also known as the sex chromosomes are used to determined the sex of an individual.
Females inherit an X chromosome from the father for an XX genotype however males inherit a Y chromosome from the father for a XY genotype. (Mother’s can only pass on X chromosomes)

Question 8

How many chromosomes do humans normally have

Answer 8

46