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Toledo PT Genetics
Toledo PT Genetics
41
Physiology
Professional
10/16/2009

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Term
T/F Genome can tell us one's predisposition to a certain disease.
Definition
True
Term
What are the only cells that are not diploid in the human body?
Definition
True
Term
What is the bond that connects the nucleotides between nucleic acids
Definition
phosphodiester bond between the 3' carbon of one nucleotide and the 5' carbon of another nucleotide.
Term
What is the backbone of DNA
Definition
sugar molecules, phosphate
Term
How is DNA duplicated?
Definition
DNA is duplicated using existing one of DNA strand as a template by DNA polymerase.
Term
What are the bases of DNA
Definition
Guanine, Thymine, Cytosine, Adenine
Term
What are the 3 different forms of RNA
Definition
rRNA, tRNA, mRNA.
Term
rRNA
Definition
ribosomal RNA (97% total RNA) a part of structural ribosome
Term
tRNA
Definition
transfer RNA (2% of total RNA) transfers amino acid to a growing peptide.
Term
mRNA
Definition
messenger RNA (1% total RNA) carries genetic code from DNA for synthesis of proteins.
Term
What is a gene?
Definition
segment of DNA molecule that contains information for building specific proteins.
Term
Promoter
Definition
upstream promoter, which may extend over as many as 200 bp farther upstream. contains signs to turn a gene on or off. transcription factors binds in this region to promote or inhibit the transcription. regulates how much RNA is manufactured.
Term
Basal promoter
Definition
located within about 40 bp of the starting site. this is found in all protein-coding genes.
Term
Exon
Definition
Contain information for the synthesis of protein.
Term
Intron
Definition
do not contain information for protein synthesis.
Term
Terminator region
Definition
contain information to stop transcription.
Term
TATA-box
Definition
Basal promoter of 7 bases. bound by large complex of some 50 different proteins. Transcription Factor IID which is a complex of TATA-binding proteins & other protein factors which bind to TBP. This is where RNA polymerase II binds.
Term
What is the flow of the central dogma of molecular biology
Definition
DNA--> RNA --> Protein
Term
What direction does RNA polymerase move on the TEMPLATE strand?
Definition
3' -> 5'
Term
Is transcription described based on the template strand or the coding strand?
Definition
Coding strand.
Term
The synthesized strand is identical to the coding strand or the template strand?
Definition
The coding strand.
Term
What direction does mRNA grow?
Definition
5' -> 3>
Term
What does Guanine base pair with?
Definition
Ctyosine
Term
What nucleotide is used to make a 5' cap for the mRNA?
Definition
modified Guanine.
Term
What does the 5' cap do for the mRNA?
Definition
It protects the mRNA from degradation by enzymes that degrade from the 5' region.
Term
Spliceosome
Definition
splices the remaining exons back together after removing the introns.
Term
What is the poly(A) tail
Definition
A nucleotides at the 3' end of the mRNA. completes the RNA molecule which is now ready for export to the cytosol. remainder of the transcript is degraded.
Term
Splicing
Definition
the process in which the introns of precursor messenger RNA are removed and the remaining exons of the pre-mRNA are stitched together.
Term
Alternative splicing
Definition
proviedes a mechanism for producing a wide variety of porteins froma small number of genes (20-25 thousand).
Term
What percentage of man's genes have alternative splicing?
Definition
50%
Term
What is a codon?
Definition
refers to the sequence of 3 RNA bases that encode a single amino acid.
Term
How many possible codons are there?
Definition
64
Term
Does the small or large ribosome subunit bind first to the RNA and does it bind upstream or downstream of the start codon?
Definition
small subunit, upstream (5'side)
Term
What are the binding sites for the large ribosomal subunit?
Definition
A (amino acid), P (peptide), E (exit)
Term
At what site does the tRNA arrive on the ribosome?
Definition
at the A site.
Term
Elongation
Definition
new tRNA to A site; preceding amino acid(AA) covalently linked to new AA. ribosomes moves. tRNA slide one position down. initiator tRNA released at E site.
Term
Termination
Definition
end of translation at stop codon (UUA, UAG,UGA). Protein-release factros recognize stop codon. Binding and GTP release polypeptide from ribosome. Ribosome splits to 2 subunits.
Term
Transcription Factor
Definition
proteins that regulate the binding of RNA polymerase, which synthsizes RNA from DNA and initation of transcription. They can either activate or inhibit RNA polymerase.
Term
Where do the transcription factors bind?
Definition
They bind to sequence-specific transcription factors on the eukaryotic promoter.
Term
T/F The promoter and the enhancer do not interact through their binding proteins.
Definition
False. They do interact through their binding proteins.
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