Chapter 5 WorkSheet- Unit 2 Exam
Which of the following is an example of simple diffusion?
A sugar cube dissolves in coffee.
Which of the following statements about ATP is inaccurate?
ATP is comprised of a sugar, base, and two phosphate groups.
Pickles are often preserved in a 20-30% salt solution called brine. How does this method prevent contamination by microorganisms?
Bacteria can't survive in a hypertonic solution because they lose water
Why do metabolic pathways require tens to hundreds of different enzymes?
Each enzyme has a specific substrate and produces a specific product
Intestinal cells absorb glucose via active transport. What would happen if all the mitochondria within these intestinal cells were destroyed?
Glucose absorption would decrease
Both starch and cellulose are made by stringing together many glucose molecules, but starch is easily digested by humans, while cellulose is indigestible. The starch polysaccharide has every bond occurring below the sugar rings while the bonds in cellulose alternate between one bond above the ring and the next below the ring. How can you explain humans' inability to digest cellulose?
The enzyme that breaks down starch can only fit the specific bond configuration of bonds below the ring.
The part of the enzyme into which the substrate fits is called the
active site
The concentration of calcium in a cell is 3%. The concentration of calcium in the surrounding fluid is 1%. Which of the following processes could the cell use to obtain more calcium?
active transport
Which of these 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
Enzymes are usually named based on the substrate that they bind. This is possible because
each type of enzyme binds only one specific substrate.
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
During an osmosis experiment in class, you look at some cells under the microscope. You notice the cells look shriveled. What type of solution were the cells immersed in?
hypertonic
Energy of activation
is the energy required for molecules to react with each other
ATP is a good source of energy for a cell because
its breakdown is coupled with energy-requiring reactions
What process allows water to move across a cell membrane?
osmosis
Which of the types of cellular activities listed below can proceed without ATP energy?
passive transport
Which of the following is an example of kinetic energy?
the skier traveling downhill
