MC
The inviting smells of homemade chili brings you into the kitchen from your bedroom. This is because the molecules in the chili have
Diffused across the house randomly.
In this type of diffusion, water is moved from an area of greater concentration to an area of lesser concentration.
Osmosis
Plants have an additional boundary called
Cell wall
When a red blood cell is healthy it is in what type of environment
isotonic
What is the importance of the lipid bilayer?
allows for only certain molecules to move through the membrane
A cell membrane is “selectively permeable” this means
A cell membrane regulates which molecules are able to pass in and out of the cell.
Molecules that cannot enter the cell through the lipid bilayer are helped with the aid of _________________ on the membrane surface.
protein (channels)
When a red blood cell has lysed it was in what type of environment
The two parts of a lipid are called the
Head and tail
What makes active transport "active' and passive transport "passive" ?
Active needs energy to move against the concentration gradient, whereas passive does not because it is moving down the concentration gradient
A cell with an equal amount of solutes inside and outside of the cell is in a(n) ________________ environment, while a cell with a higher concentration of solutes outside the cell is in a(n) _________________environment.
Isotonic, hypertonic
In cells, lipid molecules are arranged into a bilayer, this allows (hint: what can and cannot enter the cell through the membrane)
Fat soluble molecules to move through and water soluble molecules to be stopped.
When a plant is wilting its cells are in what type of environment
Hypertonic
When a plant is healthy its cells are in what type of environment
Hypotonic
Similarities and differences between facilitated diffusion and osmosis
Both are types of passive transport.
Osmosis is movement of water, facilitated diffusion needs protein channels
What was the purpose of using chemical indicators in the creation of the cell model?
To determine which substances passed through the cell membrane
In this type of diffusion, cells use transport proteins and energy to move substances.
Active transport
When a cell is in an isotonic environment it is in
Dynamic equilibrium
During passive transport molecules will flow...
Down their concentration gradient
How do proteins and lipids work together to make the cell selectively permeable?
Proteins allow for some larger and charged molecules to come through the membrane, lipids allow for only certain molecules to diffusion through the membrane
Using what you have learned about the prefixes, hypo-, hyper-, and iso-, which of the following would be the best explanation of a condition called hypothyroidism? (the thyroid produces hormones)
The thyroid under produces hormones
Which part of the lipid bilayer is hydrophobic?
Tails (inside)
The three types of passive transport are
osmosis, diffusion, facilitated diffusion
How could you get a red blood cell to shrink and then explode?
First needs to be in a hypertonic environment and then a hypotonic environment