Cell Structure and Function

What is the main driving force behind passive transport?

• Electrical current
• Temperature alone
• ATP hydrolysis
• Concentration gradient

What does the term 'selective permeability' refer to in relation to the cell membrane?

• Ability to change shape
• Ability to divide
• Ability to generate electricity
• Ability to regulate what enters and exits the cell

What is the major difference between the primary and secondary cell wall composition?

• Primary wall contains lignin
• Secondary wall contains cellulose only
• Primary wall contains pectins only
• Secondary wall contains lignin

What is the primary function of the primary cell wall?

• Provide rigidity after growth stops
• Store food reserves
• Conduct photosynthesis
• Allow for cell expansion during growth

What distinguishes facilitated diffusion from active transport?

• Type of molecules transported
• Presence of proteins
• Use of vesicles
• Movement direction relative to gradient