Microbiology Chapter 2 Test

Calculate the molecular weight of ethyl alcohol-C2H5OH

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Which type of molecule is composed of (CH2O) units? A. Carbohydrates B. Lipids C. Nucleic acids D. Proteins E. None of the above

A. Carbohydrates

Which type of molecule never contains a phosphate group? A. Carbohydrates B. Lipids C. Nucleic acids D. Proteins E. None of the above

A. Carbohydrates

Which of the following statements is Not true about the atom 6C12? A. it has 12 neutrons in the nucleus. B. its atomic number is 6. C. It has 6 electrons orbiting the nucleus. D. It has 6 protons in its nucleus. E. Its atomic weight is 12.

A. It has 12 neutrons in its nucleus.

Which of the following is NOT true? A. water molecules are formed by hydrolysis B. Water is a polar Molecule C. Salts readily dissolve in water. D. Water freezes from the top down E. Water is a part of a dehydration reaction

A. Water molecules are formed by hydrolysis

What type of bond is between ions in salt? A. ionic bond B. covalent bond C. hydrogen bond

A. ionic bond

Assume Saccharomyces cervisiae is grown in a nutrient medium containing the radioisotope 32^P. After 48 hours incubation, the 32^P would most likely be found in the S. cerevisiaes. A. Plasma membrane. B. Cell wall. C. Water. D. Proteins E. None of the above

A. plasma membranes

Identify the following reaction: Glucose + Fructose= sucrose + water A. dehydration synthesis reaction B. Hydrolysis reaction C. Exchange reaction D. Reversible reaction E. Ionic reaction

A.dehydration synthesis reaction

What are the types of bonds holding Hydrogen and Oxygen atoms in the molecule H20? A. Ionic bond B. Covalent bond C. Hydrogen bond

B. Covalent bond

which of the following statements is NOT true? A. enzymes are made of proteins B. enzymes are used up in a chemical reaction C. Enzymes lower the activation energy required for a reaction D. Enzymes increase the probability of a reaction E. none of the above.

B. Enzymes are used up in a chemical reaction

Starch, dextran, glycogen, and cellulose are polymer of? A. Amino acids B. Glucose C. Fatty acids D. Nucleic acids E. none of the above

B. Glucose

Identify the following reaction: Lactose + H20= glucose + galactose A.dehydration synthesis reaction B. Hydrolysis reaction C. Exchange reaction D. Reversible reaction E. Ionic reaction

B. Hydrolysis Reaction

Identify the following reaction: Sucrose + H2O= glucose + fructose A. dehydration synthesis reaction B. Hydrolysis reaction C. Exchange reaction D. reversible reaction E. covalent reaction

B. Hydrolysis reaction

Which of the following is the type of bond holding K+ and I- ions in KI? A. Covalent bond B. Ionic bond C. Hydrogen bond

B. Ionic Bond

Which tyler of molecule contains the alcohol glycerol? A. Carbohydrates B. Lipids C. Nucleic acids D. Proteins E. None of the above

B. Lipids

What is the type of bond between carbon, hydrogen, and oxygen atoms in organic molecules? A. Ionic bond B. Covalent bond C. Hydrogen bond

B. covalent bond

Which of the following statements is NOT true about the atom 16^O8? A. it has 8 protons in its nucleus B. It has 8 electrons in its nucleus C. It has 8 neutrons in its nucleus D. its atomic number is 8. E. Its atomic weight is 16.

B. it has 8 electrons in its nucleus.

These are the primary molecules making up plasma membranes in cells. A. carbohydrates B. Lipids C. Proteins D. Nucleic acids E. none of the above

B. lipids

The antimicrobial drug imidazole inhibits sterol synthesis. This would most likely interfere with? A. Bacterial cell walls B. Fungal Cell walls C. Eukaryotic plasma membranes D. Prokaryotic plasma membranes E. Genes

C. Eukaryotic plasma membranes

Identify the following reaction: HCl + NaHCO3= NaCl + H2CO3A.dehydration synthesis reaction B. Hydrolysis reaction C. Exchange reaction D. Reversible reaction E. Ionic reaction

C. Exchange Reaction

Which of the following is the type of bond between molecules of water in a beaker of water? A. Covalent bond B. Ionic Bond C. Hydrogen bond

C. Hydrogen Bond

Which of the following is a base? A. C2H5OCOOH- H+ + C2H5OCOO B. C2H5OH C. NaOh? Na+ + OH? D. H2O? H+ + OH? E. all of the above

C. NaOH? Na+ + OH?

Oil-degrading bacteria are naturally present in the environment but cannot degrade an oil spill fast enough to avoid ecological damage. The actions of these bacteria can be speeded up by? A. providing oil for them B. Providing sugar as a carbon source C. providing nitrogen and phosphorus D. Adding water. E. All of the above.

C. Providing nitrogen and phosphorus

Which molecule is composed of a chain of amino acids? A. carbohydrates B. Lipids C. Proteins D. Nucleic acids E. none of the above

C. proteins

Two glucose molecules are combined to make a maltose molecules. The Chemical formula for maltose is? A. C3H6O3 B. C6H12O6 C. C12H24O12 D. C12H22O11 E. C12H23O10

D. C12H22O11

Which of the following is not true about enzymes? A. Enzymes lower the activation energy of a reaction B.None of the others C. Enzymes are made up of proteins. D. Enzymes increase the number of collisions in a chemical reaction. E. Enzymes are not used up in a reaction.

D. Enzymes increase the number of collisions in a chemical reaction.

An E. coli culture that has been growing at 37 degrees C is moved to 25 degrees C. Which of the following changes must be made in its plasma membrane? A. Increase the number of phosphate ground. B. Increase the viscosity. C. Increase the number of saturated chains. D. Increase the number of unsaturated chains. E. No changes are necessary.

D. Increase the number the unsaturated chains.

Which molecule has chemicals in genes? A. carbohydrates B. Lipids C. Proteins D. Nucleic acids E. none of the above

D. Nucleic acids

Desulfovibrio bacteria can perform the following reactions: S6--->S2? These bacteria are? A. synthesizing sulfur B. Reducing Sulfur C. Hydrolyzing Sulfur D. Oxidizing sulfur

D. Oxidizing Sulfur

Which type of molecule contains -NH2 groups? A. Carbohydrates B. Lipids C. Nucleic acids D. Proteins E. None of the above

D. Proteins

Identify the following reaction: NH4OH= NH3 + H20 A.dehydration synthesis reaction B. Hydrolysis reaction C. Exchange reaction D. Reversible reaction E. Ionic reaction

D. Reversible reaction

Struturally, ATP is most like this type of molecule. A. carbohydrates B. Lipids C. Proteins D. Nucleic acids E. None of the above

D. nucleic acids

Identify the following reaction: H20 + CO2= H2CO3? A. dehydration synthesis reaction B. Hydrolysis reaction C. Exchange reaction D. reversible reaction E. covalent reaction

D. reversible reaction

Assume Saccharomyces Cerevisiae is grown in a nutrient medium containing the radioisotope 35^S. After 48 hour incubation, the 35^S would most likely be found in the S. cerevisiae. A. Carbohydrates B. Nucleic acids C. Water. D. Lipids E. Proteins

E. Proteins