cell membrane

Channels can be used to actively transport substances into and out cells.

false

Most polar molecules can cross a cell membrane via simple diffusion.

false

Na+/K+ exchange pumps allow for Na+ to diffuse out of and K+ to diffuse into cells. T OR F

false

Small, charged atoms can cross a cell membrane via simple diffusion

false

Small, charged atoms can cross a cell membrane via simple diffusion.

false

The sodium-potassium exchange pump moves both sodium and potassium at a 1:1 ratio.

false

solutes diffuse from areas of low concentration to areas of high concentration.

false

What is the function of microvilli

increase surface area for absorption

Think back to your lab on diffusion with the food coloring (or maybe you used Kool-Aid). Which of the following would increase the rate of diffusion of a solute? Choose all that apply. -Increase in temperature -Decrease in temperature -Decrease in the concentration of the solute - Increase in the concentration of the solute -Increase in the viscosity of the fluid through which the solute must diffuse

-Increase in temperature -Increase in the concentration of the solute

Which of the following describe simple diffusion? Choose ALL that apply. -does not require cellular energy -requires cellular energy -energy is provided by ATP -concentration gradient is providing the energy to move the substance -substance moves up the concentration gradient -substance moves down the concentration gradient -substance moves to areas of higher concentration -substance moves to areas of lower concentration -substancea are moved in or out of cells in vesicles -does not require a transport protein - requires a transport protein

-does not require cellular energy -concentration gradient is providing the energy to move the substance -substance moves to areas of lower concentration -does not require a transport protein

Which of the following describe osmosis? Choose ALL that apply. -does not require cellular energy -requires cellular energy energy is provided by ATP -energy is provided by allowing a molecule/ion to go down its concentration gradient -solutes move up the concentration gradient -solutes move down the concentration gradient solutes move to areas of higher concentration -solutes move to areas of lower concentration -solutes are moved in or out of cells in vesicles -water moves to areas of higher solute concentration -water moves to areas of lower solute concentration

-does not require cellular energy -water moves to areas of higher solute concentration

Which of the following describe osmosis? Choose ALL that apply. -does not require cellular energy -requires cellular energy -energy is provided by ATP -energy is provided by allowing a molecule/ion to go down its -concentration gradient solutes move up the -concentration gradient solutes move down the -concentration gradient solutes move to areas of higher concentration -solutes move to areas of lower concentration -solutes are moved in or out of cells in vesicles -water moves to areas of higher solute concentration -water moves to areas of lower solute concentration

-does not require cellular energy -water moves to areas of higher solute concentration

Which of the following describe an Na+/K+ exchange pump? Choose ALL that apply. -does not require cellular energy -requires cellular energy -energy is provided by ATP -energy is provided by allowing a molecule/ion to go down its concentration gradient - solutes move up the concentration gradient -solutes move down the concentration gradient -solutes move to areas of higher concentration -solutes move to areas of lower concentration -solutes are moved in or out of cells in vesicles -water moves to areas of higher solute concentration

-requires cellular energy -energy is provided by ATP - solutes move up the concentration gradient -solutes move to areas of higher concentration

Which of the following describe vesicular (bulk) transport (including endocytosis and exocytosis)? Choose ALL that apply. -does not require cellular energy -requires cellular energy -solutes move up the concentration gradient -solutes move down the concentration gradient -solutes move to areas of higher concentration -solutes move to areas of lower concentration -molecules are moved in or out of cells in vesicles

-requires cellular energy -molecules are moved in or out of cells in vesicles

Which of the following describe active transport? Choose ALL that apply. -does not require cellular energy -requires cellular energy -solutes move up the concentration gradient -solutes move down the concentration gradient -solutes move to areas of higher concentration -solutes move to areas of lower concentration -solutes are moved in or out of cells in vesicles -does not require a transport protein -requires transport protein

-requires cellular energy -solutes move up the concentration gradient --requires transport protein

Simple diffusion is the process of substances moving across the cell membrane, right across the phospholipid bilayer (no protein helpers needed), and without the use of cellular energy (energy of the concentration gradient is used instead). Which substances below can cross a cell membrane via simple diffusion? Choose all. -water -ions -gases -hydrophobic substances -hydrophilic substances -polar substances

-water -gases -hydrophobic substances

This question is about the lab experiment with the de-shelled eggs. A de-shelled egg had an initial width of 3.5 centimeters. It was then placed in an isotonic solution. Which of the following could be the width of the egg after a few hours, assuming no complications in the experiment? -0 -3.5 -2.5 -4.5

3.5

Isontoic

cell doesn't change

hypotonic

cell swells may burst bursts/lysis

hypertonic

cells shrink/creanates

Which of the following is normally part of the structure of a cell membrane? Choose all that are correct. -cholesterol -phospholipid -protein -carbohydrate -cytoplasm

everything BUT cytoplasm

If a cell is transporting something in bulk out of the cell, this must be: - active transport -phagocytosis -pinocytosis -exocytosis

exocytosis

What is the function of cilia?

move materials along the surface of the cell

What is the function of flagella

move the cell around

What is the function of microtubules

moves things around inside the cell

What do chemical messengers bind to?

receptors

What term refers to the membrane allowing some things to get in or out of the cell but not others. _______

semipermeable

Let's say a pancreatic cell has a higher concentration of sodium ions outside of it than in. Choose the correct statement. -sodium cannot move across the cell membrane sodium will move out of the cell via simple diffusion -sodium will move out of the cell via facilitated diffusion -sodium will move into the cell via facilitated diffusion

sodium will move into the cell via facilitated diffusion

Water moves towards

solutes, including ions

If a solute is moving across a cell membrane from an area of low concentration to area of high concentration, it must be moving via active transport T OR F

true

Most polar molecules can cross a cell membrane via facilitated diffusion.

true

The sodium-potassium exchange pump is an active transporter. T OR F

true

The sodium-potassium exchange pump requires ATP

true

True or False: If a cell does not have a receptor for insulin hormone, than likely that cell will be unaffected by insulin.

true

Water moves away from hypotonic solutions towards hypertonic solutions. hint: recall that hypo = less, and hyper = more (like hyperactive means MORE active)

true

Regarding the egg lab exercise, what was moving into and out of the egg to cause changes in size/weight? -corn syrup -solutes -water -food coloring -imposible to tell

water

Which of the following can cross a cell membrane via simple diffusion? Choose all that apply. -glucose -protein -water -H+ -oxygen gas -amino acids -DNA

water, oxygen gas