Flashcards in Transcription & Translation Deck (19):
In transcription what are the three parts of an RNA nucleotides
A. Phosphate group
c. Nitrogen base
How is RNA different from DNA
1. Uracil instead of thymine.
2. Singlestrand instead of a double.
3. Ribose instead of deoxyribose
Are the three types of RNA and what do they do
mRNA- carries message to make proteins
rRNA- makes up ribosome
tRNA- transports/ carries amino acids
What is the purpose of transcription for a cell?
To make mRNA
What are the steps of transcription
1. RNA polymerase binds a promoter sites and unzip helix
2. RNA polymerase attach nucleotides, it moves down the DNA with a strand behind it, then it zips back together
3. After, RNA completely detaches from the DNA
Compare contrast DNA Polymerase an RNA polymerase
RNA- unzips helix
-add free-floating nucleotides
What is transcripted during transcription
Where does transcription take place?
Why does the RNA polymerase know where to start and stop
Promoter and termination sites
What is the purpose of translation for cell?
Decode mRNA into proteins
Where in the cell does translation take place
On the ribosome
What is a codon
A group of three nucleotides on mRNA that code for a particular amino acid
How is mRNA translated
Nitrogen base sequence in groups of three codons
How many codons are possible
How many amino acids are there
The sequence of amino acids in a protein is always determined by the...
What is the first stage of translation what happens during this stage
-mRNA attaches to small rRNA subunit
-tRNA brings in first amino acid
-large subunit of rRNA attaches
What is the second stage of translation
-tRNA brings in amino acid based off
-peptide bond forms between each amino acid (amino acid chain grows)