Nucleus Flashcards
What is a nucleus?
A cellular organelle found within eukaryotic cells which contains the cell’s DNA and is the control center for the cell.
The structure of the nucleus includes what 3 things?
- Nuclear Envelope
- Nucleolus
- Chromatin
What does DNA do?
Store an organism’s genetic information.
What surrounds the nucleus?
The nuclear envelope.
What is the the nuclear envelope?
A double membrane composed of two lipid bilayers which surrounds the nucleus.
Does the nuclear envelope have pores?
Yes, it has pores that allow RNA to leave the cell, along with certain ions or molecules.
What is the nucleolus
A structure found within the nucleus that produces subunits of ribosomes.
Where are the subunits of ribosomes made?
Within the nucleus, then they cross through the pores and into the cytoplasm of the cell where they will connect and form the protein building organelles known as ribosomes.
What is a ribosome?
A cell organelle responsible for synthesizing proteins.
What is chromatin?
All of the eukaryotic cell’s DNA stretched out within the nucleus, along with some protein.
What happens when chromatin condenses?
It forms chromosomes. These chromosomes are visible under a microscope.
What is the purpose of chromosomes?
To allow for the passage of genetic information.
Is it easier to make RNA from DNA that is condensed or uncondensed.
It is easier to make RNA from DNA that is uncondensed in the form of chromatin.
Is it easier to move DNA during cell division when it is condensed? Or is it easier to move DNA when it is uncondensed?
It is easier to move DNA during cell division when it is condensed in the form of chromosomes.
What happens to DNA when a cell is preparing to divide?
DNA will condense into chromosomes. This allows for the passing of genetic information into the new cell. The nucleus helps to keep this genetic information organized and separate from the rest of the cell.
