Nucleus 0.0 / 5 ? BiologyCells, tissues and organsGCSEOther Created by: charucoalCreated on: 06-05-20 04:18 What is the diameter of a typical nucleus? 10-20 μm 1 of 23 What is the shape of a nucleus? Spherical shape 2 of 23 What are the functions of a nucleus #1 Contains hereditary materials in the form of DNA 3 of 23 What are the functions of a nucleus #2 DNA Replication 4 of 23 What are the functions of a nucleus #3 Directs protein synthesis (does not occur in the nucleus) 5 of 23 What are the parts of a nucleus? Nuclear envelope, nuclear pores, nucleoplasm, nucleolus & chromatin 6 of 23 What is the structure of the nuclear envelope #1 Has a double membrane: inner and outer membrane 7 of 23 What is between the outer and inner membrane of the envelope? Has a fluid-filled space of 25 nm 8 of 23 Which membrane is continuous with which organelle? The outer membrane is continuous with the RER 9 of 23 What does the inner membrane contain? Associated with intermediate filaments called nuclear lamina 10 of 23 What is the structure of the nuclear envelope #2 Perforated by nuclear pores (50-100 nm in diameter) 11 of 23 What is the function of the nuclear envelope? Facilitates the exchange of substances between the nucleus and the cytoplasm via nuclear pores found on the nuclear envelope 12 of 23 What is the structure of the nucleoplasm? A semi-fluid matrix that fills the nucleus 13 of 23 What is the function of the nucleoplasm? Serves as a medium for diffusion of metabolites and large macromolecules 14 of 23 What is the structure of the nucleolus #1 It is composed of proteins and nucleic acid 15 of 23 What is the structure of the nucleolus #2 The number of nucleoli vary in organisms 16 of 23 How many membranes does a nucleolus have? It has no membranes 17 of 23 What is the function of the nucleolus? It is the site of transcription of rRNA genes and assembly of ribosomes 18 of 23 What is the structure of chromosome #1 DNA is wrapped around histone proteins and packaged into chromosomes 19 of 23 What is the structure of chromosome #2 When not dividing, they are found as highly elongated threads called chromatin 20 of 23 What is the structure of chromosome #3 During cell division, chromatin are visible as chromosomes 21 of 23 What is the structure of chromosome #4 The number of chromosomes vary in organisms 22 of 23 What is the function of chromatin? Contains genetic information which is involved in the transmission of hereditary information from one generation to the next 23 of 23
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