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Nucleosomes are made up of double-stranded DNA that has complexed with small proteins called histones. ... Each nucleosome contains eight histone proteins (blue), and DNA wraps around these histone structures to achieve a more condensed coiled form.
- What structure contains condensed DNA?
- What is DNA when it is condensed?
- Is DNA visible under a microscope?
- What is the name of the structures responsible for generating the spindle fibers?
- What is condensed genetic material called?
- Why does DNA have to be condensed?
- Is DNA condensed during mitosis?
- What does strawberry DNA look like?
- Why does strawberry DNA extraction work?
- How can you see DNA with the naked eye?
- What structures serve as spindle fiber organizing centers?
- Which structures form the spindle fibers during cell division?
- Which structures form the spindle fibers during cell division and guide the duplicated chromosomes to their daughter cells?
- What structure are involved in the formation of chromatin?
- Why is chromatin condensed during mitosis?
- Which substance is present in chromatin?
What structure contains condensed DNA?
DNA Structure
Chromosomes are packaged by histone proteins into a condensed structure called chromatin.
What is DNA when it is condensed?
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.
Is DNA visible under a microscope?
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 the name of the structures responsible for generating the spindle fibers?
Spindle fibers are produced in the centrosome from cylindrical microtubules called centrioles.
What is condensed genetic material called?
Chromatin is a mass of genetic material composed of DNA and proteins that condense to form chromosomes during eukaryotic cell division. Chromatin is located in the nucleus of our cells.
Why does DNA have to be condensed?
During mitosis, the chromosomes condense so that each chromosome is a distinct unit. Prior to mitosis, the cell copies its DNA so that it contains two copies of each chromosome. ... Condensing the DNA into tightly packed chromosomes makes the process of chromosome alignment and separation during mitosis more efficient.
Is DNA condensed during mitosis?
During much of mitosis, DNA is wrapped and condensed into chromosomes (pictured). However, during this phase, DNA is uncondensed, and remains in the nucleus as a mass of chromatin, or a combination of DNA and proteins that the DNA wraps around.
What does strawberry DNA look like?
The DNA will look like a white, cloudy or fine stringy substance.
Why does strawberry DNA extraction work?
Ripe strawberries are an excellent source for extracting DNA because they are easy to pulverize and contain enzymes called pectinases and cellulases that help to break down cell walls. And most important, strawberries have eight copies of each chromosome (they are octoploid), so there is a lot of DNA to isolate.
How can you see DNA with the naked eye?
Slowly pour cold isopropyl alcohol into the small clear glass until the glass is nearly full. Pour alcohol as gently as possible trying not to disturb the mixture that is already in the small clear glass. Observe the white, stringy, frothy mixture in the glass- that is your DNA!
What structures serve as spindle fiber organizing centers?
Definition. Spindle fibers are microscopic protein structures that help divide genetic material during cell division and organize cellular components. The spindle fibers form out of the centrosome, also known as the microtubule-organizing center, or MTOC.
Which structures form the spindle fibers during cell division?
At the beginning of nuclear division, two wheel-shaped protein structures called centrioles position themselves at opposite ends of the cell forming cell poles. Long protein fibers called microtubules extend from the centrioles in all possible directions, forming what is called a spindle.
Which structures form the spindle fibers during cell division and guide the duplicated chromosomes to their daughter cells?
Explanation: Spindle fibers are specialized microtubule structures that guide the movement of chromosomes and chromatids during mitosis. During mitosis, the spindle fibers will bind to a protein complex (known as the kinetochore) at the center of the chromosome.
What structure are involved in the formation of chromatin?
The DNA + histone = chromatin definition: The DNA double helix in the cell nucleus is packaged by special proteins termed histones. The formed protein/DNA complex is called chromatin. The basic structural unit of chromatin is the nucleosome.
Why is chromatin condensed during mitosis?
During the prophase of mitosis, the chromatin in a cell compacts to form condensed chromosomes; this condensation is required in order for the cell to divide properly.
Which substance is present in chromatin?
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.
