topic 4 - genetics, variation & interdependence

Question 1

what is RNA?

Answer 1

• polymer of a nucleotide
• ribose, nitrogenous base, phosphate group
• short polynucleotide chain
• single stranded

Question 2

what nitrogenous bases are in RNA?

Answer 2

adenine, guanine, cytosine & uracil

Question 3

what is the function of RNA?

Answer 3

• copy & transfer genetic code from DNA in nucleus to ribosomes
• RNA combined with proteins = ribosomes

Question 4

how many types of RNA?

Answer 4

3 types:
- mRNA
- tRNA
- rRNA

Question 5

what is mRNA?

Answer 5

• messenger
• copy of a gene from DNA
• created in nucleus
• leaves nucleus to carry copy of genetic code of one gene to a ribosome (in cytoplasm)