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The Chemical Basis For Life Pre Quiz
1.
_____ An enzyme is a biomolecule that increases the rate of a chemical reaction. Which of the
following is true about enzymes?
I. Enzymes are not consumed during a chemical reaction.
II. Enzymes are specific to particular molecules.
III. Enzymes increase the energy produced by a chemical reaction.
A. II only
B. I and II only
C. I and III only
D. I, II, and III
2.
_____ When cellular respiration occurs within a cell, carbon dioxide is formed as a waste
product. The carbon dioxide is transported out of the cell and absorbed by the blood stream.
There, the carbon dioxide undergoes a chemical reaction and forms carbonic acid within the
blood.
When the carbonic acid reaches the capillaries in the lungs, the enzyme carbonic anhydrase
helps reverse the reaction, and the carbonic acid is converted back to carbon dioxide and water.
Which of the following would most likely happen if a person's body stopped producing carbonic
anhydrase?
A. The person would begin exhaling carbonic acid instead of carbon dioxide
B. The person's breathing rate would slow down.
C. The blood's acidity would increase and become toxic.
D. The blood's volume would increase until a hemorrhage occurred.
3.
_____ Enzymes are catalysts. This means that they are able to speed up chemical reactions.
Which of the following statements is also true of enzyme catalysts?
A. They increase the energy that is released by reactions.
B. They increase the energy that must be absorbed by reactions.
C. They are not used up by reactions.
D. They must be continuously replaced after each catalyzed reaction.
4.
_____ Many of the biochemical reactions that occur within your cells are catalyzed by enzymes.
Which of the following statements is true about most enzyme-assisted reactions?
A. They can take place only within a ribosome.
B. Enzymes are quickly used up during the reactions.
C. They can take place at any temperature or pH.
D. They occur more quickly than reactions without enzymes.
5. _____ Any factor that changes the shape of an enzyme can affect the enzyme's activity. Which
of the following two factors affect an enzyme's operation the most?
A. blood glucose level and pH
B. temperature and pH
C. amount of light and temperature
D. amount of light and pressure
6.
_____ Polymers of the carbohydrate monomer glucose are used as the major form of energy
storage for many plants. What are these glucose polymers called?
A. Starch
B. Maltose
C. table sugar
D. glycogen
7.
_____ What role do ATP and NADH play in living cells?
A. They provide structural support to cell membranes.
B. They are involved in cell-to-cell signaling.
C. They also store and transfer information.
D. They store and transfer energy.
8.
_____ Which of the following are examples of nucleic acids?
A. glucose and starch
B. collagen and keratin
C. saturated fats and unsaturated fats
D. DNA and RNA
9.
_____ Which of the following best describes a carbohydrate?
A. Carbohydrates always consist of a five-carbon sugar, a nitrogenous base, and one or
more phosphate groups and are used to store genetic information.
B. Carbohydrates are organic macromolecules that are insoluble in water and have the
ability to store energy for extended periods of time.
C. Carbohydrates are organic macromolecules that are made up of carbon, hydrogen, and
oxygen atoms and are used for energy storage or as structural molecules.
D. Carbohydrates are composed of amino acid monomers and are involved in cell signaling,
cell transport, immune responses, and the cell cycle.
10. _____ All living things contain carbon. Which of the following statements are true about carbon
atoms?
I. Each carbon atom can form single bonds with up to four other carbon atoms.
II. Each carbon atom can form double bonds with up to two other carbon atoms.
III. Carbon atoms can join together to form chains or rings.
IV. A single molecule of some compounds can contain thousands of carbon atoms.
A.
B.
C.
D.
I, II, and III only
I and III only
I, II, III, and IV
II and III only