Biology Quiz 3 CH 3 Cell transport and enzymes

Which process allows carbon dioxide to move across the plasma membrane?

• Endocytosis

• Passive Transport

• Facilitated Diffusion

• Exocytosis

• Active Transport

Answer explanation

Facilitated diffusion is the process that allows carbon dioxide to move across the plasma membrane. It is a passive transport mechanism that uses protein channels to facilitate the movement of molecules.

What factor influences the rate of diffusion of molecules?

• Color of the molecules

• Shape of the molecules

• Concentration gradient

• Sound intensity

• Light intensity

Answer explanation

The rate of diffusion of molecules is influenced by the concentration gradient.

What is the process called when a cell uses energy to transport a substance across a membrane, against its concentration gradient?

• Osmosis

• Passive Transport

• Active Transport

• Diffusion

• Facilitated diffusion

Answer explanation

Active Transport is the process where a cell uses energy to transport a substance against its concentration gradient.

Solution A has a higher solute concentration than solution B. This makes solution A:

• Hypertonic

• Hypotonic

• Isotonic

• Isometric

• Formative

Answer explanation

Solution A has a higher solute concentration than solution B, making it hypertonic.

If red blood cells are placed in a hypotonic solution, what will happen to the cells?

• Nothing

• Formative

• Water will enter into the cell, making it swell and possibly burst

• Water will leave the cell, making it shrink

• An equal amount of water will enter and exit the cell

Answer explanation

When red blood cells are placed in a hypotonic solution, water enters the cell, causing it to swell and possibly burst.

When placed in a type of solution, the cells below will expand and appear as shown in the image.

• Hypertonic

• Hypotonic

• Isotonic

• Formative

Answer explanation

When placed in an isotonic solution, the cells below will expand and appear as shown in the image. Isotonic is the correct choice.

In the same way as the biological macromolecules in our food, the glucose stored in our body is an example of:

• Potential energy

• Kinetic energy

Answer explanation

Glucose stored in our body is an example of potential energy, as it has the potential to be converted into kinetic energy for use by our cells.

A cell is placed in a solution that contains 10% sugar. The cell itself contains 30% sugar. What will happen due to osmosis?

• Water will flow from the solution to the cell.

• Sugar will flow from the cell to the solution.

• Water will flow from the cell to the solution.

• Sugar will flow from the solution to the cell.

Answer explanation

Due to osmosis, water will flow from the solution to the cell

Salting is a common method used to preserve foods like pickles. This involves a 20-30% salt solution known as brine. How does this high salt concentration prevent the growth of microorganisms that have a similar solute to water ratio as human blood cells (0.9% saline; 99.1% water)?

• The high salt concentration creates a hypertonic environment causing the bacteria to lose water and die

• The high salt concentration creates a hypotonic environment causing the bacteria to take in too much water and burst

• The brine solution creates an isotonic environment that is not suitable for bacterial growth

Answer explanation

The high salt concentration creates a hypertonic environment, causing bacteria to lose water and die.

Energy is stored in ATP within

• The ribose sugar

• The adenine base

• The phosphate bonds

• The hydrogen bonds

• The oxygen molecule

Answer explanation

ATP stores energy in its phosphate bonds.