What is the structure of DNA in eukaryotic cells?
What is the structure of DNA in eukaryotic cells?
Eukaryotic DNA is linear, compacted into chromosomes by histones, and has telomeres at each end to protect from deterioration. Prokaryotes contain circular DNA in addition to smaller, transferable DNA plasmids. Eukaryotic cells contain mitochondrial DNA in addition to nuclear DNA.
Where is the DNA in a eukaryote?
nucleus
Where are DNA located?
cell nucleus
How is the structure of DNA different in prokaryotes and eukaryotes?
The main difference between prokaryotic and eukaryotic DNA is their quantity, information content, packing and replication. Prokaryotic DNA is organized into a single circular chromosome and eukaryotic DNA is organized into several linear chromosomes. The amount of eukaryotic DNA is higher than prokaryotic DNA.
What is the main difference between prokaryotic and eukaryotic genes?
There are several differences between the two, but the biggest distinction between them is that eukaryotic cells have a distinct nucleus containing the cell’s genetic material, while prokaryotic cells don’t have a nucleus and have free-floating genetic material instead.
What is difference between prokaryotic and eukaryotic nucleus?
The primary distinction between these two types of organisms is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not. The nucleus is only one of many membrane-bound organelles in eukaryotes. Prokaryotes, on the other hand, have no membrane-bound organelles.
What are at least two major differences between eukaryotic and prokaryotic cells and one major similarity between the two?
What are at least two major differences between eukaryote and prokaryote cells and one major similarity between the two? Prokaryotes are typically single cell organisms, while eukaryotes cells are cells contained within organisms. Eukaryotes and prokaryote cells contain very different components within the cell.
Why is it called TATA box?
The TATA box is named for its conserved DNA sequence, which is most commonly TATAAA. Proteins called transcription factors can bind to the TATA box and recruit an enzyme called RNA polymerase, which synthesizes RNA from DNA.
What is the difference between enhancers and silencers?
Enhancers function as a “turn on” switch in gene expression and will activate the promoter region of a particular gene while silencers act as the “turn off” switch. Though these two regulatory elements work against each other, both sequence types affect the promoter region in very similar ways.
What if there is no TATA box?
When there is an absence of the TATA box and TBP is not present, the downstream promoter element (DPE) in cooperation with the initiator element (Inr) bind to the transcription factor II D (TFIID), initiating transcription in TATA-less promoters.
Is the TATA box only in eukaryotes?
The TATA box is a DNA sequence (5′-TATAAA-3′) within the core promoter region where general transcription factor proteins and histones can bind. Only eukaryotes and archaea, however, contain this TATA box.
Is the TATA box a transcription factor?
The TATA-binding protein (TBP) is a general transcription factor that binds specifically to a DNA sequence called the TATA box. This DNA sequence is found about 30 base pairs upstream of the transcription start site in some eukaryotic gene promoters.
What occurs during translation?
During translation, an mRNA sequence is read using the genetic code, which is a set of rules that defines how an mRNA sequence is to be translated into the 20-letter code of amino acids, which are the building blocks of proteins.
How does DNA get methylated?
DNA methylation is catalyzed by a family of DNA methyltransferases (Dnmts) that transfer a methyl group from S-adenyl methionine (SAM) to the fifth carbon of a cytosine residue to form 5mC (Figure 1).
Can you physically see DNA?
Given that DNA molecules are found inside the cells, they are too small to be seen with the naked eye. While it is possible to see the nucleus (containing DNA) using a light microscope, DNA strands/threads can only be viewed using microscopes that allow for higher resolution.
What is DNA look like?
A DNA molecule is a double helix, a structure that looks much like a ladder twisted into a spiral. DNA is often said to have a sugar and phosphate “backbone.” Each rung of the ladder is made of two nitrogenous bases linked together in the middle.
What is DNA long answer?
DNA or deoxyribonucleic acid is a long molecule that contains our unique genetic code. Like a recipe book it holds the instructions for making all the proteins in our bodies. Your genome? is made of a chemical called deoxyribonucleic acid, or DNA for short.
What is DNA and function?
Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the development and function of living things. All known cellular life and some viruses contain DNA. The major function of DNA is to encode the sequence of amino acid residues in proteins, using the genetic code.