General Biology Test #2 Molecules And Cells
Multiple Choice: Choose the BEST answer
- 1.When subunits called monomers are bonded together, they form larger molecules called polymers. Proteins are a type of polymer. What is the monomer that makes up proteins?
- A.
Amino acids
- B.
Ions
- C.
DNA
- D.
Nucleotides
- 2.During photosynthesis, plants convert carbon dioxide and water to sugar and oxygen. In this reaction, sugar and oxygen are the;
- A.
Enzymes
- B.
Products
- C.
Directions
- D.
Reactants
- 3.What distinguishes one element from another?
- A.
The number of protons in the nuclei of their atoms
- B.
The number of atoms in a sample of each element
- C.
The number of electrons in the nuclei of their atoms
- D.
The number of nuclei in their atoms
- 4.How is an ionic bond formed between two atoms?
- A.
A pair of electrons is shared between two atoms.
- B.
The outer energy levels of the atoms are filled.
- C.
An electrical force forms between pairs of electrons.
- D.
An electrical force forms between oppositely charged ions.
- 5.What term describes the sugar in a glass of lemonade?
- A.
Solvent
- B.
Solution
- C.
Solute
- D.
Protein
- 6.What elements make up a carbohydrate?
- A.
Carbon, nitrogen, and hydrogen
- B.
Carbon, hydrogen, and oxygen
- C.
Starches and sugars
- D.
Carbon, hydrogen, nitrogen, and oxygen
- 7.How is a saturated fatty acid different from an unsaturated fatty acid?
- A.
Saturated fatty acids contain at least one carbon-carbon double bond.
- B.
Saturated fatty acids are found only in oils.
- C.
Carbons in saturated fatty acids are bonded together only with covalent bonds.
- D.
Saturated fatty acids contain only carbon-carbon single bonds.
- 8.What term describes the amount of energy that must be absorbed before a chemical reaction can start?
- A.
Bond energy
- B.
Activation energy
- C.
Endothermic energy
- D.
Exothermic energy
- 9.What are the parts that make up the lock-and-key model of enzyme function?
- A.
Enzyme and products
- B.
Enzyme and catalyst
- C.
Enzyme and substrates
- D.
Enzyme and active site
- 10.How does a catalyst affect the activation energy of a chemical reaction?
- A.
It raises the activation energy of the reaction.
- B.
It lowers the activation energy of the reaction.
- C.
It has no effect on the activation energy of the reaction.
- D.
First it lowers the activation energy to start the reaction, then it raises the activation energy to keep the reaction under control.
- 11.What term describes the reactants that an enzyme acts on?
- A.
Substrate
- B.
Lock-and-key
- C.
Product
- D.
Active site
- 12.Which conditions are likely to affect the shape of an enzyme?
- A.
Concentration of substrate
- B.
Temperature
- C.
PH
- D.
Both temperature and pH
- 13.Acidic solutions have a pH that is
- A.
Less than 7
- B.
Between 7 and 14
- C.
A negative number
- D.
More than 7
- 14.All organic compounds contain the element
- A.
Carbon
- B.
Nitrogen
- C.
Calcium
- D.
Sodium
- 15.The molecule below is a
- A.
Lipid
- B.
Carbohydrate
- C.
Protein
- D.
Nucleic acid
- 16.The following molecules are mirror images of each other. What is the term for this?
- A.
Structural Isomers
- B.
Stereoisomers
- C.
Equivalents
- D.
Nonequivalents
- 17.What is the correct term for the energy releasing graph below?
- A.
Endothermic
- B.
Exothermic
- C.
Kinetic
- D.
Passive
- 18.What is the correct term for the energy gaining graph below?
- A.
Endothermic
- B.
Exothermic
- C.
Kinetic
- D.
Passive
- 19.The graph below shows a catalyzed reaction vs. an uncatalyzed reaction. Which of the following statements is true about the graph?
- A.
The Catalyst lowers the energy needed for the reaction to proceed.
- B.
The Catalyst raises the energy needed for the reaction to proceed.
- C.
The Catalyst does not affect the reaction.
- D.
The reaction will not work without the catalyst
- 20.Which term describes the tendency of a water molecule to stick to another water molecule?
- A.
Cohesion
- B.
Adhesion
- C.
Density
- D.
Bouyancy
- 21.Which term describes the tendency of a water molecule to stick to different types molecules?
- A.
Cohesion
- B.
Adhesion
- C.
Density
- D.
Bouyancy
- 22.The diagram below shows a water molecule. What do the charges on either end of the molecule indicate about the molecule?
- A.
Water is a polar molecule.
- B.
Water is a nonpolar molecule.
- C.
Water is an ionic compound.
- D.
Water is an ion.
- 23.What structure is found in plant cells but not in animal cells?
- A.
Nucleus
- B.
Vesicle
- C.
Vacuole
- D.
Cell wall
- 24.What materials makes up a cell membrane?
- A.
Phospholipids and proteins
- B.
Cholesterol and nucleic acids
- C.
Proteins, nucleic acids, and cholesterol
- D.
Phospholipids, cholesterol, and proteins
- 25.What type of receptor is within a cell?
- A.
Membrane receptor
- B.
Intercellular receptor
- C.
Intracellular receptor
- D.
Ligand receptor
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