Feedback Mechanisms and Transport Across a Membrane Review

During osmosis

• water moves from high to low concentration
• large or oddly shaped molecules move across a cell membrane
• water moves when energy is used
• proteins are built

Identify the cellular structure that is mostly water and is the jelly-like fluid in the cell.

• ribosome

• mitochondria

• cytoplasm

• cell membrane

• chloroplast

Tags

NGSS.HS-LS1-7

Identify the cellular structure that diffusion occurs across.

• ribosome

• mitochondria

• cytoplasm

• cell membrane

• chloroplast

Molecule A cannot diffuse. What is a possible reason why?

• Molecule A is a macromolecule and it is too large to move.

• Molecule A is a building block and it is too large to move.

• Molecule A is a building block and it is too small to move.

• Molecule A is a macromole and it is too small to move.

What color does the starch indicator turn when it comes in contact with starch?

• blue-black

• blue

• orange-red

• yellow

What is DIFFUSION?

• none

• 
• 
• 

Tags

NGSS.HS-LS2-4

Cell membranes are Selectively Permeable. This means that

• Some molecules can get in while others cannot

• All molecules may enter and leave freely

• Only large molecules enter unless energy is used

• The membrane will automatically keep concentrations the same inside and out

Tags

NGSS.HS-LS1-3

Most of the cell membrane is made of...

• Nucleic acids

• Proteins

• Lipids

• Carbohydrates

Particle of movement from an area of lower concentration to an area of higher concentration.

• Active transport

• Passive transport

Particle of movement from an area of higher concentration to an area of lower concentration.

• Active transport

• Passive transport