The Chemistry of Microbiology Quiz
Preview:
What do you call substances that can be added to a microbial culture to prevent drastic changes in pH?
A. supplements
B. antacids
C. bases
D. buffers
Which of the following illustrates a synthesis reaction?
A. 6 H2O + 6 CO2 C6H12O6 + 6 O2
B. C6H12O6 + 6 O2 6 H2O + 6 CO2
C. 2 H2O 2 H2 + O2
D. CaCO3 CaO + CO2
Which of the following statements about nucleic acids is NOT correct for cellular organisms?
A. DNA is double stranded; RNA is single stranded.
B. DNA contains carbohydrates; RNA contains amino acids.
C. DNA contains deoxyribose; RNA contains ribose.
D. DNA functions as the genetic material; RNA functions in protein synthesis.
An atom, the smallest unit of matter, is composed of all of the following EXCEPT ________.
A. photons
B. electrons
C. neutrons
D. protons
The amount of H+ in milk of magnesia, which has a pH of 10, is ________ times lower than that of seawater, which has a pH of 8.
A. 10
B. 100
C. 2
D. 20
When two atoms equally share one pair of electrons, what kind of chemical bond is formed?
A. nonpolar covalent bond
B. polar covalent bond
C. ionic bond
D. hydrogen bond
What is the most important short-term energy storage molecule?
A. nucleic acids
B. carbohydrates
C. proteins
D. adenosine triphosphate
Some microorganisms can carry out photosynthesis in order to make their own food; however, these reactions require energy input from the sun. What type of reaction is this?
A. hyperthermic
B. hypothermic
C. endothermic
D. exothermic
What type of macromolecules are polysaccharides?
A. proteins
B. lipids
C. carbohydrates
D. hexoses
When two atoms have different electronegativities, electrons are shared unequally to form what kind of chemical bond?
A. nonpolar covalent bond
B. polar covalent bond
C. ionic bond
D. hydrogen bond
DNA and RNA are composed of a sugar, a phosphate, and a nitrogenous base. What is the nitrogenous base found in RNA but not in DNA?
A. uramine
B. thymine
C. adenine
D. uracil
The atomic number of an element is ________.
A. the sum of its photons and electrons
B. the number of protons
C. the sum of its protons, neutrons, and electrons
D. the number of electrons
What is another name for a decomposition reaction?
A. anabolism
B. metabolism
C. diabolism
D. catabolism
The sequence of amino acids in a polypeptide chain is referred to as the ________ of a protein.
A. primary structure
B. secondary structure
C. tertiary structure
D. quaternary structure
The atomic mass of an atom is ________.
A. the sum of the masses of its photons and electrons
B. the number of protons
C. the sum of the masses of its protons, neutrons, and electrons
D. the number of electrons