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Biology Quiz
Cell membrane to Photosynthesis quiz
| Term | Definition |
|---|---|
| Define diffusion and osmosis | Diffusion is the passive movement of particles from a region of high concentration to a region of low concentration. Osmosis is the term used to refer to the diffusion of water * passive means without any extra energy added |
| List the roles of the cell membrane | --Separation the contents of the cell from the outside environment --Controlling which molecules enter and leave the cell --recognition of chemical signals |
| Distinguish between passive transport across membranes by simple diffusion and facilitated diffusion | Simple diffusion involves the movement of small molecules directly through the cell membrane whereas in facilitated, large molecules move through protein channels embedded in the membrane |
| Explain the role of receptor molecules in membranes | Receptor molecules in membranes are proteins that receive molecules that are sending a message to a cell. Chemical messengers include hormones, molecules that transmit a signal from one part of a multicellular organism to another and neurotransmitters |
| what are neurotransmitters? | molecules that transmit a nerve impulse from one neuron (nerve cell) to another. |
| State the initial source of energy for all living things | The sun is the initial source of energy for (most) living things. |
| State the organelle in plants and algae that is responsible for photosynthesis | The organelle in plants and algae that is responsible for photosynthesis is chloroplast. The chloroplast contains the light-absorbing pigment chlorophyll |
| Construct the word equation/chem formula for photosynthesis | Light energy + water + carbon dioxide -------> glucose + oxygen 6H2O + 6CO2 → 6H12O6+6O2 (“yields”) |
| State which reactants and products of photosynthesis are inorganic and which are organic | Organic Inorganic Glucose (reactant) Light energy (product) Water (product) Carbon dioxide (product) |
| What is chlorophyll and what does it do? | Chlorophyll is a pigment that absorbs red and green light and converts it to green, making plants look green to us. |
| What is the chloroplasts function? | Converts light energy into chemical energy |
| What are receptor molecules and what do they do? | Receptor molecules in membranes are proteins that receive molecules that are sending a message to a cell. Chemical messengers include hormones, molecules that transmit a signal from one part of a living organism to another. |
| How do receptor molecules bond with receptors and what do they bond to? | A further example would be the lock and key principle. --receive signals from outside the cell, passing the signal to the inside Molecules that bind to receptor sites are known as ligands(i. e hormones and neurotransmitters). |
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nu er
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