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53 Cards in this Set

  • Front
  • Back

What is is the main role of DNA

To store information, info to make and maintain a new organism

What is a nucleotide?

Building block of DNA/RNA, and made up of either ATCG. And it is linked to a sugar, which is linked to a phosphate group

Which base in DNA is methylated

Cytosine, methylation had the effect of inactivating a gen.

What is the error rate of DNA replication and why is it so low

One in every 10^9 bases replicated. It is so low because the mechanisms of DNA fix errors in the base pairing of the new DNA strand.


What part of dna determines whether a gene is active or inactive?

Determined by the non coding regions that surround the coding sequence in the gene.

What does it mean when genetic code is degenerate?

Most amino acids can be specified by more than one codon; we can deduce the protein sequence from DNA, but we cannot unambiguously deduce a nucleic acid sequence from a protein sequence.

What amino acid is usually removed from newly synthesized protein?

Methionine, the first amino acid of most proteins.

RNA main role

Transfer if data from DNA and use thus information to manufacture proteins.

What is the connection between the mrna and protein chain?

The trna, it binds to the ribosome.

Is it possible for a rns polymerase molecule and a ribosome to be attached to a eukaryotic mRNA simultaneously?

False

At no time during protein synthesis does an amino acid make direct contact with the mRNA being translated. T or F

True

What are promoters?

Promoters are control regions in dna at which RNA polymerase binds to initiate transcription.

Where do bacterial promoters usually start before what site?

Transcription start site

What are the main problems finding promoters in DNA sequence?

Because the sequence outside of the conserved motif varies alot, and motifs also vary from gene to gene.

Is the prokaryote terminator sequence more variable than the promoter sequence?

Yes

Is the prokaryote terminator sequence usually included in genome annotations?

No

What are activators?

They are proteins that enhance the binding g of RNA polymerase leading to increase gene expression.

What are repressors?

They inhibit the expressions of the gene by blocking the promoter sites.

Why are activators and repressors important ?

They are an additional controls for regulating and translating genes. Have a say on when or whether transcription actually occur.

What us the major difference between eukaryotes and prokaryotes in terms of their transcription?

Eukaryotes mRNA transcripts are super modified before translation. (Splicing)

What is the shine dalgarno sequence?

Sequence ths indicates the ribosome binding site in bacterial dna. Typically AGGAGGU. It is located a few beds up stteam from start codon AUG.

How do viruses replicate?

Utilize cell machinery to replicate and produce proteins. They must hijack a living cell of another organism

What are plasmids?

Plasmids are small circular extra chromosomal DNA molecules that carry extra Gene's. Gene's from drug resistance are what a plasmid can carry.

Two groups for classifying proteins

Polar and hydrophobic

What are homologous proteins?

Proteins with a common ancestor.

What would be attached to the 5' carbon of the ribose(sugar) of the first nucleotide in a polymer?

A phosphate group,

What are the differences in the monomer in dna versus rna.

Thymadine is found in DNA but not in RNA. There is a 2' hydroxilc on the RNA monomer but not th4 dna.

Pairwise alignment

Infer biological relationships from sequence similarity

Multiple sequence alignment

Infer sequence similarity from biological relationships

Why do we align sequences?

Similar dna sequences produce similar proteins, which can show what functions and structures those proteins may have if they are similar. Also to check whether to or more genes/proteins are evolutionarily related.

Why would a Dot matrix SA be good?

Can see all the possible marches of residues

Pam and blossom differences

Pam is used to track evolutionary origins of proteins where blossom is designed to find their conserved domains.

What is this image of

What is this image of

Genback database results

Just study it



Remember that noncoding and template are the same

What are the stop codons?

UAA, UAG, UGA

What tool is this

What tool is this

Blast Tool

What Tool is this?

What Tool is this?

Genome Browser

On genome browser tool, what does red indicate?

Non synonymous mutations, red, synonymous for green

How do you create a odds table from frequency?

Take the frequency of the amino acid in the column and divide it by the frequency of the amino acid in the organism

How do you get a value of the PWM

take log 2 of the odds

What can you say about the box?

What can you say about the box?

There are TANDEM REPEATS

Paired-end sequencing, bowtie?

This creates 2 FASTQ files that respond to the forward orientation of fragments, and the other the opposite

What is a Phred Quality Score?

A Phred quality score is a measure of the quality of the identification of the nucleobases generated by automated DNA sequencing.

What is a reference Genome?

A set of nucleic acid sequences assembled as a representative example of a species’ genetic material.




Do not represent a SINGLE organism more like a mosaic of different nucleic acid sequences from each individual.

NGS, types from back then to now

Gel based, Sanger Sequencing, NextGen

Why is NGS MASSIVE PARALLEL SEQUENCING

because you are sequencing all these different parts of the genome all at the same time!

NGS DNA Prep Steps

- Fragment DNA


- Repair ends of the DNA


- A-tailing, adapters are ligated


- Bridge formation and amplification


- Finished flow cell


- sequence by synthesis




note: Flow cell has adapters at each end



NGS Libraries

creates a library of DNA fragments for sequencing

NGS Lanes

flow cell has several independent lanes during single sequencing

NGS Flowcells

NGS machine processes a single one

Clean C/T heterozygote

half of them are going to have one base to another one

What is the lowest Phred Score for good quality?

20