Cell Structure: The Structure and function of the nucleus. Flashcards
Function of the nucleus?
= site of dna replication and transcription
= contains genetic information
What is nucleoplasm?
= jelly like material
What is the double membrane of the nucleus called?
= nuclear envelope
= consists of 2 phospholipid bilayers.
What are the nuclear pores?
= allow molecules to enter and leave the nucleus.
= RNA nucleotides e.g;
What is chromatin?
= contains DNA coiled around the protien Histone, this forms chromosomes.
= chrosomes are not visible in the nucleus unless the cell is going through mitosis or meiosis.
What is the nucleolus?
= where rrna is produced
= rna to make ribosomes
What does the nucleus do for protein synthesis?
= instruction for encoding the amino acids sequence of a protein are contained within the gene for that protien.
To synthesis protein what happens to the genetic information encoded by the gene?
= converted to messanger RNA. (MRNA) + leaves the nucleus.
= TRANSCRIPTION.
What does the ribosome do to the MRNA?
= ribosome reads the information in the MRNA and synthesises protien.
= TRANSLATION.
What does the ribosome do to the MRNA?
= ribosome reads the information in the MRNA and synthesises protien.
= TRANSLATION.
What happens if the Protien remains in the cytoplasm?
= Translation will take place on a free ribosome in the cytoplasm.
What happens when protiens are secreted from the cell?
= translated on a ribosome attached to the rough endoplasmic reticulum.
= make their way through rough ER and golgi apparatus before leaving the cell.
