Transcription

Question 1

similarities between DNA and RNA

Answer 1

have 5 carbon sugars
phosphate group
nitrogenous base
joined by phosphodiester bonds
adenine, guanine and cytosine.

Question 2

differences between DNA and RNA

Answer 2

mRNA- single stranded DNA- is double
DNA- deoxyribose sugar mRNA- contains ribose sugar
DNA- thymine base mRNA- uracil

Question 3

where in the cell does transcription take place

Answer 3

inside the nucleus

Question 4

define the term gene

Answer 4

a sequence of bases on a DNA molecule that codes for a sequence of amino acids in a polypeptide chain

Question 5

what is transcription

Answer 5

when a small section of DNA is copied to make mRNA

Question 6

process of transcription

Answer 6

1-
DNA unwinds and hydrogen bonds are broken by DNA helicase
2-
antisense strand is used as a template
3-
free RNA nucleotides line up against CBP on antisense strand
4-
enzyme RNA polymerase joins RNA nucleotides with phosphodiester bonds (in a condensation reaction) to form mRNA
5-
mRNA is a complementary copy of DNA antisense strand
6-
mRNA detaches from DNA and exits nucleus through nuclear pours into the cytoplasm

Question 7

roll of RNA polymerase in transcription

Answer 7

joins RNA nucleotides together (by phosphodiester bonds in condensation reaction)