Transport and Enzymes

Plasma membranes are selectively permeable. This means

• anything can pass in and out

• the membrane regulates the passage of the material in and out of the cell

• glucose cannot enter the cell

• cholesterol cannot enter

Which one of these organelles are exclusive to plant cells?

• Mitochondria

• Nucleus

• Chloroplasts

• Ribosomes

Tags

NGSS.MS-LS1-6

This image is an example of a phospholipid. Which part of a phospholipid is HYDROPHOBIC?

• the phosphate "head"

• the lipid "tails"

Which one of these is NOT a function of the Plasma Membrane?

• Cell signalling

• The site of aerobic respiration

• Provide structure to the cell

• Recognises foreign substances

Which way across the concentration gradient do substances travel if they are being transported passively?

• Against the concentration gradient

• Down the concentration gradient

Which one of the following pictures shows facilitated diffusion?

• 
• 
• 
• 

How does water enter the root hair cell of a plant?

• Osmosis

• Endocytosis

• Facilitated diffusion

• Passive diffusion

Active transport is movement of particles through the cell membrane from a region of ...1... to a region of ...2... using energy in the form of ...3...

• 1: lower concentration, 2: higher concentration, 3: NADPH

• 1: higher concentration, 2: lower concentration, 3: NADPH

• 1: higher concentration, 2: lower concentration, 3: ATP

• 1: lower concentration, 2: higher concentration, 3: ATP

Enzymes are proteins. True or False?

• True

• False

What is the induced fit model?

• The enzyme and the substrate are an exact fit.

• When the substrate binds to the enzyme, the enzyme changes shape slightly to fit the substrate and catalyse the reaction