Download Protein synthesis 2 - Hicksville Public Schools

Name __________________________________
Date _________
Period ____
Living Environment: 4 Protein Synthesis
Aim: How Are Proteins Synthesized?
1) What are the main jobs of DNA?
a. _____________________
b. ________________ __________________
2) Why does DNA Replicate? What process is it part of?
________________________________________________
3) How are proteins synthesized?
The 2 Processes are involved:
i. __________________________________
ii. __________________________________
4) Why does mRNA have to leave the nucleus?

What does the DNA contain the instructions for? ___________________________________

mRNA takes the coded message of DNA out of the nucleus. Where does it have to go? _________

Once in the cytoplasm, what organelle will the mRNA seek out? __________________________
5) What is the function of ribosomes?
What is synthesized (made) here? ___________________
The building blocks required to make these organic molecules are: __________________________
6) What transports the amino acids to the ribosomes? ________
7) What are the parts of the tRNA?
1) ____________________ - three base pairs that are
complimentary to a specific codon in the mRNA.
2) __________________________ - a specific amino acid
binds here.
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8) How does the tRNA know what amino acid to deliver?
 tRNA has an ___________________________ and also attaches to
amino acids and brings them to the ribosome.
9) mRNA
– tRNA –
Amino Acid
GGG…….. ____________
___________________
AUC…..… ____________
___________________
ACC…..… ____________
___________________
CGU…..… ____________
___________________
10) mRNA vs. tRNA:
a) Messenger RNA Where is mRNA carrying the instructions from and to?
________________________________________
b) Transfer RNA What does it bring to the ribosome?
_______________________
11) Steps of Protein Synthesis:
1. DNA is Transcribed into mRNA.
2. What enters the cytoplasm from
the nucleus? _______
3. tRNA picks up amino acids.
Where do they go?
___________________________________________
4. A codon is a series of 3 bases found on the mRNA. How does an amino acid attach to each other
to form the protein? ______________________________________________________________
5. What type of bonds are formed between the amino acids as they are
linked together? ________________________________
6. A releasing factor binds to one of 3 “stop codons”. What is the
purpose of the stop codon?
____________________________________
STOP CODONS: ____________, __________, __________
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