What are chromatin used for?
Chromatin fibers are coiled and condensed to form chromosomes. Chromatin makes it possible for a number of cell processes to occur including DNA replication, transcription, DNA repair, genetic recombination, and cell division.
What is the chromatin in plant or animal cells?
Chromatin is found in both plant and animal cells. The major difference between plant and animal cells is that plant cells have a cell wall and chloroplasts.
What is a chromatin in a cell?
Chromatin is a complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells. … During cell division, the structure of the chromatin and chromosomes are visible under a light microscope, and they change in shape as the DNA is duplicated and separated into two cells.
What do animal cells have that plant cells don t?
Plant cells have a cell wall, but animals cells do not. Cell walls provide support and give shape to plants. … Chloroplasts enable plants to perform photosynthesis to make food. Plant cells usually have one or more large vacuole(s), while animal cells have smaller vacuoles, if any are present.
How chromatin is formed?
Each nuclesome is composed of DNA wound 1.65 times around eight histone proteins. Nucleosomes fold up to form a 30-nanometer chromatin fiber, which forms loops averaging 300 nanometers in length.
What is a ribosomes function?
Ribosomes have two main functions — decoding the message and the formation of peptide bonds. These two activities reside in two large ribonucleoprotein particles (RNPs) of unequal size, the ribosomal subunits. Each subunit is made of one or more ribosomal RNAs (rRNAs) and many ribosomal proteins (r-proteins).
Why chromatin is found only in eukaryotic cells?
Chromosomes are made up of a DNA-protein complex called chromatin that is organized into subunits called nucleosomes. The way in which eukaryotes compact and arrange their chromatin not only allows a large amount of DNA to fit in a small space, but it also helps regulate gene expression.
How does chromatin structure affect gene expression?
Chromatin structure plays a key role in regulating gene expression by allowing DNA accessibility to transcriptional machinery and transcription factors .