Nucleus Flashcards
What does the nucleus do?
- Controls the cell’s activities ( through the transcription of DNA ).
- Contains the organisms genetic material.
What is the nuclear envelope?
- A double membrane that surrounds the nucleus.
* Has an outer membrane that is continuous with the endoplasmic reticulum of the cell and has ribosomes on its surface.
What is the purpose of the nuclear envelope?
- Controls entry and exit of materials in and out of the nucleus.
- Contains the reactions taking place within the nucleus.
What is the purpose of nuclear pores?
• Allow passage of large molecules ( mRNA ) out of the nucleus.
What is the nucleoplasm?
The material that makes up the bulk of the nucleus.
What is the nucleolus?
A small spherical region within the nucleoplasm.
What is the purpose of the nucleolus?
• Manufactures ribosomal RNA and assembles the ribosomes.
What is inside the nucleus?
- Nuclear Envelope
- Nuclear Pores
- Neoplasm
- Chromosomes
- Nucleolus.
What are the functions of the nucleus?
• Act as the control cell of the cell through the production of mRNA and tRNA, and protein synthesis.
• Retain the genetic material of the cell in the form of DNA and chromosomes.
Manufacture ribosomal RNA and ribosomes.
What are the structures that make up the mitochondrion?
- Double membrane
- Matrix
- Cristae
What does the double membrane do?
• Controls the entry and exit of material.
How are the cristae formed?
The inner membrane of the double membrane folds to form a structure called cristae.
What is the matrix?
• Contains protein, lipids, ribosomes, and DNA that allows the mitochondria to control the production of their own proteins.
• Contains enzymes involved in respiration.
The Matrix makes up inside of the mitochondrion.
What is the cristae?
Extensions of the inner membrane.
What is the purpose of the cristae?
Provide a large surface area for the attachment of enzymes and other proteins involved in respiration.
