09. mRNA, rRNA and tRNA

What does mRNA stand for?

Messenger RNA

What is mRNA?

Long single stranded molecule

Where is mRNA synthesised?

In the nucleus

What does the mRNA do?

Carry genetic information from DNA in the nucleus to the ribosome in the cytoplasm

Describe what the mRNA strands have?

Each strand has code for 1 gene -> Each gene codes for a particular polypeptide

What does rRNA stand for?

Ribosomal RNA

Where is rRNA found?

Cytoplasm

What is rRNA?

Component of ribosomes

What are ribosomes made of?

rRNA and protein

Where are ribosomes synthesised?

In the nucleolus of the nucleus (leave nucleus via nuclear pores)

What occur at the ribosome?

Protein synthesis by translation

What does tRNA stand for?

Transfer RNA

What is tRNA?

small single stranded molecule folded into clover leaf shape

Describe the structure of tRNA?

Each tRNA molecule has amino acid attachment site CCA, opposite end has triplet of bases called anticodon

What does tRNA do?

Transport amino acids to the ribosomes

Describe the anticodon of tRNA?

Form complex with complimentary bases on mRNA molecule (codon) -> Allows translation

How big is tRNA?

70-90 nucleotides