DNA and RNA

Question 1

DNA

(4)

Answer 1

• double stranded
• Adenine pairs with thymine
• Guaning pairs with cytosine
• deoxyribose sugar

Question 2

RNA

(4)

Answer 2

• single stranded
• adenine pairs with uracil
• guanine pairs with cytosine
• ribose sugar

Question 3

What are the three types of RNA

Answer 3

messenger RNA, transfer RNA, ribosomal RNA

Question 4

mRNA

Answer 4

• the end product of the transcription of a gene; mRNA is translated by ribosomes into a protein
• varies in length, depening on thr gene that has been copied
• acts as a mediator between DNA and ribosomes
• is the RNA version of the gene encoded by DNA

Question 5

tRNA

Answer 5

• a carrier molecule that binds to a specific amino acid and adds the amino acid to the growing polypeptide chain
• acts as delivery system of amino acids to ribosomes as they synthesize proteins
• very short, only 70-90 base pairs long

Question 6

rRNA

Answer 6

• RNA molecule within the ribosome that bonds the correct amino acid to the polypeptide chain
• binds with proteins to form the ribosomes
• varies in length