Biology: Molecular Genetics
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A nucleotide monomer contains:
- 1. nitrogen base
- 2. sugar
- 3. phosphate
What is the structure of mRNA?
A. double helix
B. clover leafed shaped
(this multiple choice question has been scrambled)
What is the structure of rRNA?
a. double helix
c. clover leafed shaped
During DNA replication, _____________ attach to each strand of the uncoiled DNA to keep them separate.
single strand binding proteins
Topoisomerases are what type of enzymes?
DNA polymerase synthesizes in the ____________ direction.
5' --- 3'
During mRNA processing, a 5' cap is added to the 5' end of the mRNA.
What does this capping provide?
- Capping provides stability to the mRNA
- * made up of guanine nucleotide with 2 phosphate
The Poly-A tail is attached the ______ end of the mRNA.
What does the poly-A tail mainly composed of?
Adenine bases -- approx. 200
What does the Poly-A tail do ?
provides stability to the mRNA and also appears to control the movement of the mRNA across the nuclear envelope.
__________ are sequences that express a code for a polypeptide.
Before the mRNA moves to the cytoplasm, _________________ delete the introns and splice the exons.
small nuclear ribonucleoproteins or snRNP's
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