Week 4 needs monday prelecture content + friday all content Flashcards
What is a molecule of DNA in a cell?
A chromosome.
What is a solute, solvent, and solution?
Solute: the minor component in a solution, dissolved in the solvent.
Solvent: able to dissolve other substances.
Solution: a type of mixture involving two or more substances.
What are cells mostly?
Water. Most substances inside a cell are dissolved solutes. (eg. sodium ions, ATP, proteins).
What is the molecular difference between a solid and a liquid?
In a liquid, molecules are free to move around, always in motion. -this is also true for a solution.
In a solid, the particles still move but by vibrating around a fixed position.
Why does diffusion happen (eg. dye in water)?
Happens because of random movement, and the molecules per chance end up spread out. (check later cause of concentration gradient theory).
What is diffusion used for in the cell?
It is the main way molecules get from one place to another.
Eg. enzyme and reactant randomly go around the cell until they combine and react.
What is the state of the membrane?
It is fluid/flexible. The phospholipids and particles are free to move within the membrane.
What happens to the membrane as the shape of the cell changes?
The membrane flows over the outside and conforms to the shape.
What is the network of protein filaments inside a cell called?
The cytoskeleton.
What is the analagous network (to cytoskeleton) called in animals?
Extracellular membrane.
Do plants have an extracellular membrane?
No, as they instead have cell walls that provide shape and strength.
