Cell Transport Quiz

Movement of substances through a cell's membrane without using energy is called:

Answer explanation

Movement of substances through a cell's membrane without using energy is known as passive transport. This process relies on concentration gradients, allowing molecules to move from areas of high to low concentration naturally.

In what type of solution is concentration of the solute equal inside and outside

• hypertonic

• isotonic

• hypotonic

• tonic

Answer explanation

An isotonic solution has equal concentrations of solute inside and outside the cell, leading to no net movement of water. In contrast, hypertonic and hypotonic solutions have unequal solute concentrations, causing water movement.

A solution is made up of two components: the __________and the ______________.

Answer explanation

A solution consists of two main parts: the solvent, which is the substance that dissolves, and the solute, which is the substance being dissolved. Thus, the correct terms to fill in the blanks are 'solvent' and 'solute'.

Active transport is required:

• during osmosis

• when substances are too large to cross the membrane

• when substances are too small to cross the membrane

Answer explanation

Active transport is necessary when substances are too large to cross the membrane, as it requires energy to move these larger molecules against their concentration gradient, unlike osmosis or small substances.

Movement of molecules from an area of greater concentration to an area of lower concentration is called:

• passive transport

• active transport

• solvent

• solute

Answer explanation

Movement of molecules from an area of greater concentration to an area of lower concentration is known as passive transport. This process does not require energy, distinguishing it from active transport, which does.

A cell regulates what come in and out through the:

• semi-permeable membrane

• solvent

• solute

• solution

Answer explanation

A cell regulates what comes in and out through the semi-permeable membrane, which selectively allows certain substances to pass while blocking others, maintaining homeostasis.

Difference in concentration of molecules across a cell membrane

______________________ means there is the SAME concentration of solute molecules outside the cell as inside.

Osmosis is:

• used during active transport

• the diffusion of water through a cell membrane

• when solutes move from areas of high concentration to low concentration

• uses ATP to occur

Answer explanation

Osmosis specifically refers to the diffusion of water through a cell membrane, distinguishing it from other processes like active transport and solute movement, which involve different mechanisms.

If there is a greater concentration of solute molecules outside of a cell:

• water will move inside of the cell

• it is a hypotonic solution

• cells will grow in size and burst

• it is a hypertonic solution

Answer explanation

A greater concentration of solute outside the cell indicates a hypertonic solution. In this case, water moves out of the cell to balance the solute concentration, potentially causing the cell to shrink.