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Organelles of the cell-nucleus- ap biology
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- 1NucleusMost prominent organelle in the cell.
Contains the cell's DNA and directs the synthesis of ribosomes and proteins. - 2NeucloplasmThe nucleus stores chromatin (DNA plus proteins) in a gel-like substance called the nucleoplasm
- 3nucleolusThe nucleolus is a condensed region of chromatin where ribosome synthesis occurs.
- 4Nuclear membrane/ envelopeThe boundary of the nucleus is called the nuclear envelope. It consists of two phospholipid bilayers: an outer membrane and an inner membrane. The nuclear membrane is continuous with the endoplasmic reticulum.
- 5nuclear poresNuclear pores allow substances to enter and exit the nucleus.
- 6nuclear envelopeThe nuclear envelope is a double-membrane structure. Both the inner and outer membranes of the nuclear envelope are phospholipid bilayers.
Contains pores that control the passage of ions, molecules and RNA. - 7nucleoplasmThe nucleoplasm is the semi-solid fluid inside the nucleus, where we find the chromatin and the nucleolus.
- 8chromosomesChromosomes are structures within the nucleus that are made up of DNA, the hereditary material.
In eukaryotes, chromosomes are linear structures.
In humans, the chromosome number is 46 - 9chromatinChromosomes are only visible and distinguishable from one another when the cell is getting ready to divide. When the cell is in the growth and maintenance phases of its life cycle, proteins are attached to chromosomes, and they resemble an unwound, jumbled bunch of threads. These unwound protein-chromosome complexes are called chromatin
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- ap exam (Biochemistry) Biology Fichas sobre Organelles of the cell-nucleus- ap biology, creado por Memo amro el 18/07/2015.
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