Chapter 5 Unit Quiz
The part of the enzyme into which of the substrate fits is called the
Active site.
The concentration of calcium in a cell is 3%. The concentration of a calcium in the surrounding fluid is 1%. Which of the following processes could the cell use to obtain more calcium?
Active transport
Which of theses words should be classified separately from the others?
Active transport
Which of the following terms best describes entropy?
Disorder
Simple diffusion across a plasma membrane is called passive transport because it
Does not require energy from the cell.
When a car burns gasoline, much of the energy is released in the form of heat. Which of the following best describes this process in relation to the first law of thermodynamics?
Energy can be changed from one form to another
When neurons release their neurotransmitters, they release them in secretory vesicles that fuse with the plasma membrane. What type of cellular transport if this?
Exocytosis
Molecules move from greater to lesser concentration through a carrier protein in
Facilitated diffusion
What function do the carrier proteins embedded in the cell membrane serve?
Facilitated diffusion
What process typically regulates the enzymes involved in metabolic reactions?
Feedback inhibition
Which of the following is a mechanism used to regulate enzyme activity?
Feedback inhibition
Intestinal cells absorb glucose via active transport. What would happen if all the mitochondria within theses intestinal cells were destroyed?
Glucose absorption would decrease.
Simple diffusion of molecules occurs
In nonliving systems as well as living systems.
Energy of activation
Is the energy required for molecules to react with each other.
What process allows water to move across a cell membrane?
Osmosis
A white blood cells surrounds and engulfs a worn-out red blood cell. This process is called
Phagocytosis
What prevents a plant cell from bursting in a hypotonic solution?
The presence of a cell wall
What is the biological risk of using salt on icy roads in parts of the country that have a cold winter season?
The salt has the risk of leeching into the ground and creating a hypertonic environment for plant cells.