Ch 2 Micro

Which of the following statements about the atom ¹²₆C is false?
A) It has 6 protons in its nucleus.
B) It has 6 electrons orbiting the nucleus.
C) It has 12 neutrons in its nucleus.
D) Its atomic weight is 12.
E) Its atomic number is 6.

¹⁶₈O ¹²₆C ¹₁H
calculate the molecular weight of ethanol, C₂H₅OH.
A) 34
B) 33
C) 96
D) Can't tell
E) 46

Antacids neutralize acid by the following reaction. Identify the salt. Mg(OH)2 + 2HCl →
MgCl2 + H2O
A) Mg(OH)2
B) HCl
C) MgCl2
D) H2O
E) None of the above

Which of the following statements is false?
A) Water molecules are formed by hydrolysis.
B) Water is a part of a dehydration reaction.
C) Salts readily dissolve in water.
D) Water is a polar molecule.
E) Water freezes from the top down.

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

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

What is the type of bond holding hydrogen and oxygen atoms in the H2O molecule?
A) Ionic bond
B) Covalent bond
C) Hydrogen bond

Identify the following reaction: Glucose + Fructose → Sucrose + Water
A) Reversible reaction
B) Ionic reaction
C) Dehydration synthesis reaction
D) Hydrolysis reaction
E) Exchange reaction

Identify the following reaction: Lactose + H2O → Glucose + Galactose
A) Reversible reaction
B) Dehydration synthesis reaction
C) Ionic reaction
D) Hydrolysis reaction
E) Exchange reaction

Identify the following reaction: HCl + NaHCO3 → NaCl + H2CO3
A) Exchange reaction
B) Ionic reaction
C) Hydrolysis reaction
D) Reversible reaction
E) Dehydration synthesis reaction

Identify the following reaction: NH4OH ⇌ NH3 + H2O
A) Dehydration synthesis reaction
B) Ionic reaction
C) Reversible reaction
D) Exchange reaction
E) Hydrolysis reaction

Which type of molecule contains the alcohol glycerol?
A) Carbohydrate
B) Protein
C) Lipid
D) Nucleic acid

Which type of molecule is composed of (CH2O) units?
A) Nucleic acid
B) Lipid
C) Carbohydrate
D) Protein

Which type of molecule contains -NH2 groups?
A) Carbohydrate
B) Protein
C) Nucleic acid
D) Lipid

Which type of molecule NEVER contains a phosphate group?
A) Nucleic acid
B) Protein
C) Carbohydrate
D) Lipid

Which of the following statements about the atom ¹⁶₈O is false?
A) Its atomic number is 8.
B) It has 8 electrons in its nucleus.
C) It has 8 neutrons in its nucleus.
D) It has 8 protons in its nucleus.
E) Its atomic weight is 16.

Using the information in Table 2.2, calculate the number of moles in 92 grams of ethanol, C2H5OH.
A) 4
B) 2
C) 1
D) Can't tell
E) 3

The following chemical reaction is used to remove chlorine from water. What type of
reaction is it?
HClO + Na2SO3 → Na2SO4 + HCl
A) Ionic synthesis reaction
B) Exchange synthesis reaction
C) Hydrolysis synthesis reaction
D) Dehydration synthesis reaction
E) Reversible synthesis reaction

Which of the following pairs is mismatched?
A) KH2PO4 ⇌ K+ + H2PO4- – acid
B) NaOH ⇌ Na+ + OH- – base
C) HF ⇌ H+ + F- – acid
D) MgSO4 ⇌ Mg2+ + SO42- – salt
E) H2SO4 ⇌ 2H+ + SO42- – acid

What is the type of bond between the hydrogen of one molecule and the nitrogen of another
molecule?
A) Ionic bond
B) Disulfide bond
C) Hydrophobic bond
D) Covalent bond
E) Hydrogen bond

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

What is the type of bond between ions in salt?
A) Ionic bond
B) Covalent bond
C) Hydrogen bond

Identify the following reaction: H2O + CO2 ⇌ H2CO3
A) Exchange reaction
B) Reversible reaction
C) Dehydration synthesis reaction
D) Hydrolysis reaction
E) Covalent reaction

Identify the following reaction: Glycine + Lysine → Dipeptide + H2O
A) Dehydration synthesis reaction
B) Reversible reaction
C) Exchange reaction
D) Covalent reaction
E) Hydrolysis reaction

Identify the following reaction: Sucrose + H2O → Glucose + Fructose
A) Covalent reaction
B) Exchange reaction
C) Reversible reaction
D) Hydrolysis reaction
E) Dehydration synthesis reaction

Structurally, ATP is most like which type of molecule?
A) Lipid
B) Carbohydrate
C) Protein
D) Nucleic acid

What do genes consist of?
A) Proteins
B) Carbohydrates
C) Lipids
D) Nucleic acids

Which molecule is composed of a chain of amino acids?
A) Lipid
B) Carbohydrate
C) Protein
D) Nucleic acid

Which are the primary molecules making up plasma membranes in cells?
A) Carbohydrates
B) Proteins
C) Lipids
D) Nucleic acids

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

C---N

What kind of bond is at the arrow in Figure 2.1?
A) Disulfide bridge
B) Peptide bond
C) Hydrogen bond
D) Double covalent bond
E) Ionic bond

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

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

Assume Saccharomyces cerevisiae is grown in a nutrient medium containing the
radioisotope 32P. After a 48-hour incubation, the 32P would most likely be found in the S.
cerevisiae's
A) Water.
B) Carbohydrates.
C) Plasma membrane.
D) Cell wall.
E) Proteins.

Starch, dextran, glycogen, and cellulose are polymers of
A) Fatty acids.
B) Amino acids.
C) Acids.
D) Glucose.
E) Nucleic acids.

Which of the following is a base?
A) C2H5OH
B) C2H5OCOOH → H+ + C2H5OCO
C) NaOH → Na+ + OHD)
H2O → H+ + OHE)
H2CO

Two glucose molecules are combined to make a maltose molecule. What is the chemical
formula for maltose?
A) C₁₂H₂₄O₁₂
B) C₁₂H₂₂O₁₁
C) C₆H₁₂O₆
D) C₁₂H₂₃O₁₀
E) C₃H₆O₃

Desulfovibrio bacteria can perform the following reaction: S6- → S2-. These bacteria are
A) Synthesizing sulfur.
B) Reducing sulfur.
C) Oxidizing sulfur.
D) Hydrolyzing sulfur.

Oil-degrading bacteria are naturally present in the environment but cannot degrade an oil
spill fast enough to avoid ecological damage. How can the actions of these bacteria be sped up?
A) Provide sugar as a carbon source.
B) Add NaCl.
C) Provide nitrogen and phosphorus.
D) Provide oil for them.
E) Add water.