click below
click below
Normal Size Small Size show me how
BIO C1
Cell Biology
Term/Question | Definition |
---|---|
What do ALL cells have in common? | Cytoplasm and cell membrane |
What are some exceptions to cell theory? | There are three main examples: 1) Skeletal muscle ): larger [300mm] cells with hundreds of nuclei 2) Giant algae ): 100 mm BT ONE cell! 3) Aseptate Fungi ): consist of hyphae; "long" cell with cytoplasm and many nuclei |
What should you remember when asked to DRAW on exams? | 1) Ruler 2) Sharp/straight lines |
What should you remember when asked to LABEL on exams? | Use lines drawn with rules instead of arrows |
What are the universal FUNCTIONS OF LIFE in all cells? | Nutrition Excretion Reproduction Metabolism Growth Homeostasis Response |
Why does a cell need excretion? | To get rid of waste products from metabolism e.g. CO2 (hums) |
How does cells get nutrition and why? | By e.g. ingestion/production because of energy for metabolism |
How do cells reproduce? | asexual or sexual with mitosis and/or miosis |
What is metabolism? | normal cell function + catabolism/anabolism |
What is essentially growth in cells? | Become larger due to nutrition |
What is response in cells, examples? | Response in cells are to stimuli. E.g. change direction when hit a solid object or move towards light |
What is homeostasis? | Keeping internal conditions within limits, e.g. with waste products and |
What problems do cells face regarding surface area to volume ratio? | if the SURFACE AREA is too BIG, then the rate of production/use is too low if the VOLUME is too BIG, then the rate of substance in and out become limited and may overheat |
What are two advantages of being multicellular? | 1) Avoid too large cells i.e. volume & surface area 2) Divide the work by differentiation; organelles conduct specific tasks instead of 1 cell |
What are emergent properties in cells? | All the cellular components work together in symbiosis = 'the whole is greater than the sum of its parts' |
What is differentiation in cells? | During a cell's development, it uses only the genes in its genome relevant to carry out its intended purpose. E.g. genes for making haemoglobin only used in red blood cells. |
What are stem cells? | Special cells that 1) Divide rapidly 2) Can differentiate into many purposes |
What happens when stem cells commit themselves to a pathway? | It can no longer differentiate, and is thus not a stem cell anymore. |
Where do we find and not find stem cells? | Find in: 1) Embryo 2) Most adult tissues Not in: 1) Brain 2) Heart 3) Kidney |
What is the advantage of stem cells in adult tissues? | Repair and formation of the tissue is extremely fast |
Why do embryos initally consist of nearly (?) only stem cells? | Because the cells in the embryo will differentiate into different tissues/cells in a human body |
What can stem cells be used for in science? | Replace damaged tissue in therapeucy e.g. nerves, brain, heart. |