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6. The Phosopholipid bilayer is?
- Double layer of phosolipids, with a hydrophillic head and hydrophobic tail
- Proteins and lipids arranged in a fluid mosaic model
7. Which of these is not correct?
- Anaphase- Centromeres split and the chromatids move to the poles of the cell
- Prophase - Supercoiling of chromosomes, nuclear envelope breakdown, spindle forms
- Cytokinesis - Cytoplasm spilts to make two genetically different cells
- Metaphase -Chromosomes line up at equator of cell, with the spindle attached at the centromere
- Telophase - Chromatids have reached the poles, nuclear envelope reforms and chromosomes begin to unravel
8. What is not a function of the membrane?
- Produce proteins for repair
- Membranes produce different compartments inside cells
- Cell recognition and signalling (such as electrical signals)
- Separate cell contents from the outside
- Regulate transport in and out of cell
9. What is the use of glycolipids?
- Maintains the stability and fluidity of the bi-layer when the temperature fluctuates
- have a carbohydrate attached and is used for cell signaling, adhesion and cell surface antigens
- Channel proteins allow larger molecules and ions through, carrier proteins actively transport things in and out of the cell
10. What is the use of cholesterol?
- Channel proteins allow larger molecules and ions through, carrier proteins actively transport things in and out of the cell
- Have a carbohydrate attached used for cell signalling and adhesion
- Maintains the stability and fluidity of the bi-layer when the temperature fluctuates
- have a carbohydrate attached and is used for cell signaling, adhesion and cell surface antigens
11. What is diffusion?
- Net movement of molecules from an area of high concentration to an area of low concentration
- Channel proteins provide pathways for charged molecules or those that are too big,
- Net movement of water from high water potential to low water potential
- Movement of ion across membranes through protein pumps that use ATP to move within the mebrane
12. What are glycoprotiens used for?
- have a carbohydrate attached and is used for cell signaling, adhesion and cell surface antigens
- Maintains the stability and fluidity of the bi-layer when the temperature fluctuates
- Channel proteins allow larger molecules and ions through, carrier proteins actively transport things in and out of the cell
13. What effect does heat not have on the plasma membrane?
- Channel proteins start to denature leaving big gaps in the cell membrane
- Molecules vibrate less so less molecules come through
- Molecules vibrate more, leaving temporary gaps in the phospholipid bilayer
14. What are the use of proteins in the plasma cell membrane?
- Channel proteins allow larger molecules and ions through, carrier proteins actively transport things in and out of the cell
- Maintains the stability and fluidity of the bi-layer when the temperature fluctuates
- have a carbohydrate attached and is used for cell signaling, adhesion and cell surface antigens
15. What is facilitated diffusion?
- Movement of ion across membranes through protein pumps that use ATP to move within the mebrane
- Channel proteins provide pathways for charged molecules or those that are too big,
- Net movement of water from high water potential to low water potential
- Vesicles moving large amount of substance in and out of the cell via ATP
16. How is exocytosis and endocytosis carried out?
- Vesicles moving large amount of substance in and out of the cell via ATP
- Channel proteins provide pathways for charged molecules or those that are too big,
17. What is cell signalling not used for?
- Movement of molecules from an area of high concentration to low
- Hormones will attach to a receptor of target cells and internal response is triggered
- Drugs like beta- blockers or aspirin will bind to certain receptors on cells
- Some drugs that treat depression like diazepan mimic a neurotransmitter
18. Which of these statements are true?
- Homologous chromosomes are chromosomes that don't have different versions of a gene at the same locus
- Yeast uses mitosis to bud and make a new organism
- Stem cells are undifferentiated cells that are not capable to differentiating into a number of different types of cells
- Meiosis produces genetically different cells
19. What is the right order of mitosis?
- Interphase (Cell replication), Prophase ,Metaphase, Anaphase, Telphase , Cytokineses
- Prophase, Interphase (Cell replication), Metaphase, Anaphase, Telphase , Cytokineses
- Metaphase, Anaphase, Telophase, Interphase (Cell replication), Prophase ,Cytokinesis
20. What happens to a plann cell in high and low Ψ ?
- Turgid and Plasmolysed
- Lysis and Crentation