Unit 1 Biology Exam Revision Quiz

Which of the following best describes the process of diffusion?

• Movement of water across a semi-permeable membrane

• Movement of molecules from an area of high concentration to an area of low concentration

• Movement of molecules against a concentration gradient

• Movement of molecules through a protein channel

What is the primary function of the plasma membrane?

• To provide structure to the cell

• To control the movement of substances in and out of the cell

• To store genetic information

• To produce energy for the cell

Which model describes the structure of the plasma membrane?

• Lock and Key Model

• Induced Fit Model

• Fluid-Mosaic Model

• Double Helix Model

What is facilitated diffusion?

• Movement of molecules through a protein channel without energy input

• Movement of molecules against a concentration gradient using energy

• Movement of water molecules through a semi-permeable membrane

• Movement of molecules through the lipid bilayer without assistance

Which term describes a solution with a higher concentration of solutes compared to the inside of a cell?

• Isotonic

• Hypotonic

• Hypertonic

• Osmotic

What is the role of phospholipids in the plasma membrane?

• To provide energy for the cell

• To form a barrier that is selectively permeable

• To store genetic information

• To facilitate cell division

How can the surface area to volume ratio affect cells?

• It determines the cell's ability to store genetic information

• It affects the rate at which materials can enter and leave the cell

• It influences the cell's ability to produce energy

• It controls the cell's ability to divide

What is osmosis?

• Movement of solutes from an area of low concentration to high concentration

• Movement of water molecules through a semi-permeable membrane

• Movement of molecules through a protein channel using energy

• Movement of molecules against a concentration gradient

What is the function of xylem in plant tissues?

• To transport water and nutrients from roots to other parts of the plant

• To produce energy through photosynthesis

• To store genetic information

• To facilitate gas exchange

Which of the following components is NOT part of a feedback loop?

• Stimulus

• Receptor

• Modulator

• Effective