Bio Unit 2 II

Which biological molecule is NOT found in a typical sample of cell membrane?

nucleic acid

when equilibrating, particles tend to move from where they are

more concentrated to where they are less concentrated

Facilitated diffusion

moves substances from high to low concentration and requires a membrane protein

Which biological molecule is NOT found in a typical sample of cell membrane?

nucleic acid

Simple diffusion

requires a membrane protein and moves substances from high to low concentration

Active transport

requires energy to occur, requires a membrane protein, and moves substances from low to high concentration

Osmosis

requires energy to occur, requires a membrane protein, and moves water through a selectively permeable membrane from low to high concentration

When a cell is placed in a hypertonic solution

water exits the cell towards the area of higher solute concentration

Which statement comparing facilitated diffusion to active transport is correct?

Facilitated diffusion moves materials with the concentration gradient while active transport moves materials against the concentration gradient

Which term is used to label plant cells completely full of both water and pressure?

turgid

A substance that needs cellular energy to move across a membrane tends to move

away from the area where it is less concentrated

A beaker is divided into two halves (A and B) by a selectively permeable membrane that allows water to freely go through but stops the glucose from going through.  Side A contains a 2% glucose solution and side B contains a 4% glucose solution.  Which statement best describes what will happen to the system over time? 

Water will only move from Side A to Side B

The bursting of cells due to osmosis is called

lysis

When comparing osmosis in plant and animal cells, which statement would be correct?

Animal cells will lyse when placed in a hypotonic solution

Which statement concerning passive and active transport is most accurate?

Active transport does require cell energy and moves materials from low to high concentration.

Which of the following would most likely pass through a phospholipid bilayer the easiest?

oxygen molecules

An animal cell (92/8) is placed in a container with distilled water (100/0).  What will happen to this animal cell?

It will lyse.

A plant cell (92/8) is placed in a container with salt water (80/20).  What will happen to this plant cell?

It will be plasmolysed.

An animal cell (92/8) is placed in a container with salt water (80/20).  What will happen to this animal cell?

It will crenate.

What's the main difference between diffusion and osmosis?

Diffusion moves non-water materials to a lower concentration; osmosis moves water through a membrane to a lower concentration

Which statement concerning passive and active transport is most accurate?

Passive transport doesn't require cell energy and moves materials from high to low concentration.

Why is active transport important to biological systems?

Active transport is the only way biological systems have of maintaining a concentration gradient.