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what is DNA fingerprinting?
mention the role of ribosomes in peptide-bond formation. how does ATP facilitate?
If E.Coli was allowed to grow for 80 minutes then what would be the proportions of light and hybrid densities DNA molecules?
if the length of E.coli DNA is 1.36mm, calculate the no.of base pairs in E.coli
Why the distance b/w two polynucleotide chains in DNA remains constant?
Why do RNA viruses mutate faster than other viruses?
EXPLAIN the process of transcription in bacteria with diagram.
A typical mammalian cell has 22 meters long DNA molecule whereas the nucleus in which
what is oblique binary fission .Explain the mechanism of this type of fission taking the example of Ceratium??????????
why is DNA a better genetic material than RNA?
what is difference between vntr and a probe?
tell me the concept of lac operon?
what you mean by saying haploid content of human dna is 3.3*109 base pairs?
How many nucleosomes are there in a mammalian cell?
i want three differance between DNAs and DNase? with proper explaination.
plz explain phosphoester and phosphodiester bond..? and whay do you mean that phosphate group attaches to 5'-OH of nucleoside to form nucleotide..???
Mention the causes of DNA polymorphism
explain the process of transcription in eukaryotes with diagram.
what is bulk DNA and satellite DNA?
why galactose or glucose cannot act as inducer in lac operon???
why the distance between two polynucleotide chains in dnaemains almost constant?
what does "The plane of one base pair stacks over the other in a double helix. This provides stability to the helix along with hydrogen bonding" mean?
What is the difference between polycistronic and monocistronic ?
write a note on human genome project? (5 MARKS QUESTION)
kindly answer as we have to write it in exams which could fetch us maximum marks. i.e. in points or paragraph?
Why the distance between two polynucleotide chains remain constant...??
what is chromatin
Due to an error during transcription ATG of DNA formed UAG in mRNA.What would happen to polypeptide chain
during translation by this changed mRNA?
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explain the role of 35s and 32p in the experiments conducted by hershey and chase
please explain the messelson and stahl's experiment
WHAT U MEAN BY DNA FINGERPRINTING?EXPLAIN
PLZ XPLAIN BARR BODY..?
what do u mean by the term TERMINISM???
rnWhat is DNA polymorphism? Why is it important to study it?rn
What is DNA polymorphism? Why is it important to study it?
What is Euchromatin and Heterochromatin ?
what is the difference between cistron and operon.
Explain the complexities in translation and transcription in eukaryotes that are not seen in bacteria ?
Explain 'Transforming Principle' in Griffith experiment,'S strain and R strain' in griffith experiment?
briefly explain me the process of DNA replication, transcription and translation.
how is lac operon switches on and off .how does it sfunctions are activated and inhibited
skin colour of humans are polygenic
what is meant by capping and tailing in transcription process in eukaryotes?
1)why does DNA replication occur in small replication forks not in its entire length? 2)why is DNA replication continuous and discontinuous in a replication fork? 3)explain the importance of "origin of replication" in a replication fork.
what is splicing?why is it necessary in eukaryotes cells?
what is satellite dna in a genome?explain their role in dna finger printing?
what is the difference between coding and non coding strands?
In prokaryotes well defined nucleus is absent and DNA is scattered bt in our ncert text book it is given that DNA is not scattered throughout the cell,...its tooo confusing...what to refer plzz help me out..!!!
when and what end does the tailing of hnRNA take place?
if ecoli was allowed to grow for 80 minutes then what would be the propotion of light and hybrid density of Dna molecule?
How is the length of DNA calculated?
pls explain replication of dna and semiconservative nature of dna i detail?
what is the similarities between DNA polymerase and RNA polymerase
DNA packaging in Eukaryotes : It is carried out with the help of lysine and ariginine rich basic proteins called histone. The unit of compaction is nucleosome. There are five types of histone proteins H1, H2A, H2B, H3 and H4. Four of them occur in pairs to produce histone octamer (2 copies of each - H2A, H2B, H3 and H4), called nu body or core of nucleosome. Their positively charged ends are directed outside. They attract negatively charged strands of DNA. About 200 bp of DNA is wrapped over nu body to complete about turns. This forms a nucleosome of size 110 x 60 (11 x 6 nm ). DNA present between two adjacent nucleosome is called linker DNA. It is attached to H1 histone protein. Length of linker DNA varies from species to species. Nucleosome chain gives a beads on string appearance under electron microscope. The nucleosomes further coils to form solenoid. It has diameter of 30 nm as found in chromatin. The beads-on-string structure in chromatin is packaged to form chromatin fibres that are further coiled and condensed at metaphase stage of cell division to form chromosomes. The packaging at higher level requires additional set of proteins that collectively are referred to as non-histone chromosomal (NHC) proteins. In a typical nucleus, some region of chromatin are loosely packed (and stains light) and are referred to as euchromatin. The chromatin that is more densely packed and stains dark is called as heterochromatin, specifically euchromatin is said to be transcriptionally active and heterochromatin is transcriptionally inactive.
Acidic protein is also called NHC (non histone chromosomal) protein, it is of three types:
(i) Scaffold or structural NHC protein.
(ii) Functional NHC protein e.g., DNA polymerase, RNA polymerase.
(iii) Regulatory NHC protein e.g., HMG (controls gene expression).
Chemical Composition of Chromosome
A chromosome consists of following chemical compositions
DNA is unzipped twice ina cell.Name the 2 diifrent events which can occur and the enzyme s responisble for it?
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