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Cell Membrane Solutions Molecular

Movement Systems Regulating pH

What is the function of the cell membrane?

To separate the internal env. Of the cell from its external env.

100 points!

Name all of the parts of the cell membrane.

200 points!

How is a cell membrane different from a cell wall?

A cell wall is ridged and provides structural support

around a cell membrane. Acts as a pressure vessel around the cell

membrane of plants, bacteria and fungus

300 points!

What’s the difference b/w active and passive transport?

Passive transport requires no energy and substances move with the concentration gradient. Active transport requires the use of ATP

by cells and moves substances against the concentration gradient.

400 points!

How does the fluid mosaic model help scientists explain the function

of the cell membrane?

Proteins allow for active transport, phosholipid bilayer allows for

Transfrer of small, uncharged, polar molecules.

500 points!

What is a solute?

The substance that gets dissolved into a solvent.

Example: Salt into water(Solute) (Solvent)

100 points!

What are the three types of solutions?

Hypotonic solutionsHypertonic solutions

Isotonic solutions

200 points!

A cell is placed in a solution and no change is observed in the cells

mass. What type of solution is the cell in?

Isotonic solution

300 points!

A cell is placed into a solution that causes it to burst within 12 hours.

What type of solution is it in?

A Hypotonic solution

400 points!

How can an unknown solution be identified as either a hypertonic, hypotonic or isotonic solution? Describe how you would design

your experiment.

Put a homogenate of cells into different concentrations of the

solution. Observe the results.

500 points!

Use an example to describe diffusion.

Answers will vary.... Perfume being sprayed down the

hall...Air freshener...Flatulence... 100 points!

Explain how water enters and leaves living cells.

The process of osmosis is what allows for water to move across the

bilayer

200 points!

Using an example from one of the labs from this unit explain how it

demonstrated some type of molecular movement across a

membrane

Answers will vary..

300 points!

Describe the concept of permeability

Permeability describes how particles move across a surface

When a surface does not allow any substances to pass through it's

impermeable. Glucose through a membrane=

permeable Starch through dialysis tubing=

impermeable 400 points!

Describe how your body uses diffusion to rid itself of waste

products.

Within the lungs, tiny capillaries on the alveoli fresh oxygen diffuses in

exchange for for the common cellular waste of CO2

Within the kidneys, small capillaries filter blood and through diffusion remove excess: water, salt

and nitrates (ammonia NH3)

500 points!

What is another name for the gas exchange system?

Respiratory system

100 points!

What system distributes nutrients throughout the body?

Cardiovascular system/circulatory system

200 points!

Which part of the brain is responsible for temperature

regulation?

The Hypothalamus

300 points!

What system regulates hormone production that helps support

homeostasis?

The Endocrine system

400 points!

Explain how the gas exchange system and the cardiovascular

system work together to maintain homeostasis.

Respiratory system exchanges gases with lungs, while the

circulatory (cardiovascular) system exchanges gases with the body’s

cells. The circulatory system moves the gases throughout the

body.500 points!

What does pH stand for?

per Hydrogen = pH

100 points!

A substance with a pH of 8.9 is considered to be a _____________

Base

200 points!

The pH scale increases or decreases by what mathematical

factor?

Every jump between whole numbers on the pH scale represents an increase or

decrease in the number of H+ ions by factor of 10

300 points!

Explain how cells use buffers

Cells are surrounded by a layer of molecules that maintain a constant pH so when a cell gets surrounded

by a solution with a potntially destabilizing pH cells can protect

against immediate damage.

400 points!

Daily Double!

500 points!