Chromatin is a complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells. Nuclear DNA does not appear in free linear strands; it is highly condensed and wrapped around nuclear proteins in order to fit inside the nucleus. Chromatin exists in two forms.
What is compacted DNA called?
The answer to this question lies in the fact that certain proteins compact chromosomal DNA into the microscopic space of the eukaryotic nucleus. These proteins are called histones, and the resulting DNA-protein complex is called chromatin.
What does a centrosome look like?
Centrosomes are made up of two, barrel-shaped clusters of microtubules called “centrioles” and a complex of proteins that help additional microtubules to form. This complex is also known as the microtubule-organizing center (MTOC), since it helps organize the spindle fibers during mitosis.
What is a condensed chromosome called?
Chromosomes are packaged by histone proteins into a condensed structure called chromatin. … The condensed chromatin is folded and tightly coiled, like a coiled telephone cord, allowing the cell’s DNA to be packed into the nucleus.
What is Euchromatic nucleus?
Euchromatin is a lightly packed form of chromatin (DNA, RNA, and protein) that is enriched in genes, and is often (but not always) under active transcription. … 92% of the human genome is euchromatic. In eukaryotes, euchromatin comprises the most active portion of the genome within the cell nucleus.
What is it called when a cell divides?
Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells. … Mitosis is a fundamental process for life. During mitosis, a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells.
What is it called when chromosomes appear?
prophase. a cell division begins, the chromatin threads coil and shorten so that visible bar like bodies (chromosomes) appear.
Which is popularly known as suicidal bag?
Lysosomesare known as suicidal bags of the cell.
What is chromatin DNA?
Chromatin is a substance within a chromosome consisting of DNA and protein. The DNA carries the cell’s genetic instructions. The major proteins in chromatin are histones, which help package the DNA in a compact form that fits in the cell nucleus.
What do ribosomes do?
Ribosomes are the sites in a cell in which protein synthesis takes place. Cells have many ribosomes, and the exact number depends on how active a particular cell is in synthesizing proteins.
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What is the function of the lysosome?
A lysosome is a membrane-bound cell organelle that contains digestive enzymes. Lysosomes are involved with various cell processes. They break down excess or worn-out cell parts. They may be used to destroy invading viruses and bacteria.
What is Euchromatic and heterochromatic?
The major difference between Euchromatin and Heterochromatin is that euchromatin is an uncoiled packed and genetically active form of chromatin. While heterochromatin is a firmly packed form and is a genetically inactive part of the chromosomes.
How is DNA methylated?
DNA methylation refers to the addition of a methyl (CH3) group to the DNA strand itself, often to the fifth carbon atom of a cytosine ring. This conversion of cytosine bases to 5-methylcytosine is catalysed by DNA methyltransferases (DNMTs).
What is epigenetic expression?
Epigenetics has been defined as ‘the study of mitotically (and potentially meiotically) heritable alterations in gene expression that are not caused by changes in DNA sequence‘ (Waterland, 2006).
What does a metaphase look like?
Metaphase is a stage in the cell cycle where all the genetic material is condensing into chromosomes. … During this stage, the nucleus disappears and the chromosomes appear in the cytoplasm of the cell. During this stage in human cells, the chromosomes then become visible under the microscope.
What is metaphase chromosome?
Metaphase chromosome: A chromosome in the stage of the cell cycle (the sequence of events in the life of a cell) when a chromosome is most condensed and easiest to distinguish and so to study. Metaphase chromosomes are often chosen for karyotyping and for chromosome analysis because they are readily seen.
What is a daughter cell?
[ dô′tər ] n. Either of the two identical cells that form when a cell divides.
What's another name for mitosis?
cell divisionamitosiscellular divisioncytokinesismeiosis
What happens anaphase?
During anaphase, each pair of chromosomes is separated into two identical, independent chromosomes. The chromosomes are separated by a structure called the mitotic spindle. … The separated chromosomes are then pulled by the spindle to opposite poles of the cell.
Is chromatin coiled or uncoiled?
Chromatin is unpaired, they are uncoiled, long and thin sturctures inside the nucleus, it can be found throughout the whole cell cycle. When it undergoes further condensation it forms the chromosome. Chromosomes are condensed Chromatin Fibers. They are paired, coiled, thick and ribbon-like structure.
What is chromatin name two components of chromatin?
The two main components of chromatin are DNA and histones.
Is chromatin and chromatin Fibres same?
Difference between Chromosomes and ChromatinCHROMATINCHROMOSOMESComposed of nucleosomesThey are condensed chromatin fibersUnpairedPaired
What is called the powerhouse of the cell?
Taking in glucose and oxygen, mitochondria produce energy, which they capture and package as energy-rich molecules of ATP. …
What are suicidal bags Why are they called so?
Lysosomes are known as suicide bags of the cell because they contain lytic enzymes capable of digesting cells and unwanted materials. autolysis and burst open when the cell is damaged. This causes the hydrolytic enzymes to be released.
Which organelle is known as the powerhouse of the cell Why?
Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.
What is a cytoplasm?
Cytoplasm is the gelatinous liquid that fills the inside of a cell. It is composed of water, salts, and various organic molecules. Some intracellular organelles, such the nucleus and mitochondria, are enclosed by membranes that separate them from the cytoplasm.
Why is it called 70S ribosome?
Bacteria and archaebacteria have smaller ribosomes, termed 70S ribosomes, which are composed of a small 30S subunit and large 50S subunit. The “S” stands for svedbergs, a unit used to measure how fast molecules move in a centrifuge.
What is Golgi apparatus do?
(GOL-jee A-puh-RA-tus) A stack of small flat sacs formed by membranes inside the cell’s cytoplasm (gel-like fluid). The Golgi apparatus prepares proteins and lipid (fat) molecules for use in other places inside and outside the cell. The Golgi apparatus is a cell organelle.
What happens if a cell's lysosomes are damaged?
If a cell’s lysosomes were damaged, which of the following would most likely occur? The cell would be less able to break down molecules in its cytoplasm. How would muscle cells differ from other animal cells? The muscle cells would have more mitochondria.
What would happen if a cell's lysosomes burst?
If the lysosome gets ruptured or bursts open within a cell then it’ll cause autolysis i.e, it’ll digest the whole- cell alongside the cell organelles. … … They break down excess or worn- out cell parts. The invading viruses and bacterias are destroyed by the lysosomes.
Which disease is caused due to the hyperactivity of lysosomes?
Gaucher disease is one of the most common lysosomal storage disorders (LSDs). LSDs are inherited disorders resulting from a lack of specific enzymes that break down certain lipids (fats) or carbohydrates (sugars) in the body cells.
