BI 234 Exam | CMIS 234 Exam
QUESTIONS WITH ACCURATE
ANSWERS BEST STUDYING MATERIAL
GRADED A
Which of the following is TRUE of ionic bonds?
a. They are formed due to the mutual attraction of cations and anions
b. Electrons are shared by atoms
c. They are stronger than covalent bonds
d. They are weaker than hydrogen bonds
e. None of the above (all of the above are true of ionic bonds)
- Ans - A
Which of the following statements is NOT true?
●
a. The energy required to cause a chemical reaction to occur is called the activation
energy
b. Enzymes increase the probability that a chemical reaction will take place by lowering
the activation energy
c. Synthesis (anabolic) reactions are usually exergonic
d. Chemical reactions in living cells are catalyzed by enzymes
e. None of the above (all of these statements are true)
- Ans - c
Which of the following statements is NOT true of biological organic molecules?
●
a. Their atoms are mostly or entirely held together by ionic bonds
b. They're usually polymers formed from subunits (monomers)
c. Monomers are linked (bonded) together by dehydration synthesis
d. Always contain hydrogen and carbon
e. None of the above (i.e., all of the above are true)
- Ans - A
1.You observe a cell through a microscope and see that it has a nucleus surrounded by
a membrane. To which Domain of organisms does it belong?
a. Bacteria
b. Eukarya
c. Plants
d. Archaea
e. Cannot be determined from the information provided
- Ans - B
,In the Gram stain, gram-positive bacteria are dark purple for all the following reasons
EXCEPT:
a. Thick peptidoglycan in the gram-positive cell wall prevents decolorization by alcohol
b. The primary stain, Crystal Violet, is dark purple
c. Crystal Violet is fixed inside the cell as a CV-iodine complexonce iodine is added
d. The counterstain (safranin) is purple
e. None of the above (All are reasons that gram-positive bacteria are purple in the Gram
stain) - Ans - D
If a bacterial cell is placed in a hypotonic (hypoosmotic) solution:
a. Water moves through the plasma membrane into the cell, sometimes causing
osmotic lysis
b. The cell undergoes plasmolysis
c. Water moves through the plasma membrane out of the cell
d. There is no net movement of water either into or out of the cell
e. None of the above describes what happens in a hypotonic solution
- Ans - A
All of the following are TRUE of competitive inhibition of enzymes EXCEPT:
a. The inhibitor competes with the substrate for the enzyme's active site
b. In the presence of the inhibitor, the enzyme reaction is less likely to occur
c. The inhibitor competes with the substrate for the enzyme's allosteric site
d. The inhibitor is similar enough in structure to the substrate tobind to the enzyme's
active site
e. None of the above are true of competitive inhibition of enzymes
- Ans - c
All of the following are true EXCEPT:
a. In biological oxidation reactions, the organic molecule receives electrons from a
carrier molecule
b. Energy released through biological oxidation reactions can be trapped and stored in
ATP
c. ATP can be generated by substrate level, oxidative, or photophosphorylation
d. Catabolic (breakdown) and anabolic (synthesis) reactions are "coupled" by ATP
e. None of the above (All are true)
- Ans - A
The complete aerobic respiration of glucose yields far more energy stored in ATP than
glycolysis alone for all ofthe following reasons EXCEPT:
a. Krebs cycle generates some additional ATP through substrate- level phosphorylation
b. Glycolysis only partially oxidizes the glucose molecule to pyruvic acid
, c. Electron transport chain (terminal respiratory pathway) produces many ATPs through
oxidative phosphorylation using electron carrier molecules (NADH and FADH2)
d. Krebs cycle generates reduced electron carrier molecules (NADH and FADH2)
e. None of the above (All are reasons that aerobic respiration yields more energy than
glycolysis alone)
- Ans - E
Without using oxygen, some microorganisms can convert pyruvic acid to a variety of
end-products such as ethyl alcohol, lactic acid, acetic acid, and butyric acid. This
process is called:
a. Photosynthesis
b. Fermentation
c. Respiration
d. Glycolysis
e. None of the above
- Ans - B
Which of the following is NOT true of photosynthesis?
a. The light-independent ("dark") reaction makes glucose from carbon dioxide (CO2)
and water, using energy trapped by the light-dependent reaction
b. Light-excited electrons in chlorophyll provide the energy for ATP production
c. The light-independent ("dark") reaction converts light energy to chemical energy
stored in ATP
d. The light-dependent reaction captures electrons in NADPH, which are used for
glucose synthesis in the light-independent ("dark") reaction
e. None of the above (all are true of photosynthesis)
- Ans - C
Which of the following is NOT correctly matched?
a. Capnophile - microbe requiring a reduced-concentration CO2 environment for optimal
growth
b. Halophile - microbe that grows best in an environment with high osmotic pressure
c. Agar - complex polysaccharide from seaweed used as a solidifying agent in culture
media
d. Colony - a population of microbial cells arising from a single cell or spore or from a
group of attached cells
e. None of the above (All are correctly matched)
- Ans - A
Which of the following is NOT correctly matched?
a. Pasteurization - heating at 72o C for 15 seconds to kill pathogenic (disease- causing)
microbes
b. Bacteriostasis - killing living bacteria
QUESTIONS WITH ACCURATE
ANSWERS BEST STUDYING MATERIAL
GRADED A
Which of the following is TRUE of ionic bonds?
a. They are formed due to the mutual attraction of cations and anions
b. Electrons are shared by atoms
c. They are stronger than covalent bonds
d. They are weaker than hydrogen bonds
e. None of the above (all of the above are true of ionic bonds)
- Ans - A
Which of the following statements is NOT true?
●
a. The energy required to cause a chemical reaction to occur is called the activation
energy
b. Enzymes increase the probability that a chemical reaction will take place by lowering
the activation energy
c. Synthesis (anabolic) reactions are usually exergonic
d. Chemical reactions in living cells are catalyzed by enzymes
e. None of the above (all of these statements are true)
- Ans - c
Which of the following statements is NOT true of biological organic molecules?
●
a. Their atoms are mostly or entirely held together by ionic bonds
b. They're usually polymers formed from subunits (monomers)
c. Monomers are linked (bonded) together by dehydration synthesis
d. Always contain hydrogen and carbon
e. None of the above (i.e., all of the above are true)
- Ans - A
1.You observe a cell through a microscope and see that it has a nucleus surrounded by
a membrane. To which Domain of organisms does it belong?
a. Bacteria
b. Eukarya
c. Plants
d. Archaea
e. Cannot be determined from the information provided
- Ans - B
,In the Gram stain, gram-positive bacteria are dark purple for all the following reasons
EXCEPT:
a. Thick peptidoglycan in the gram-positive cell wall prevents decolorization by alcohol
b. The primary stain, Crystal Violet, is dark purple
c. Crystal Violet is fixed inside the cell as a CV-iodine complexonce iodine is added
d. The counterstain (safranin) is purple
e. None of the above (All are reasons that gram-positive bacteria are purple in the Gram
stain) - Ans - D
If a bacterial cell is placed in a hypotonic (hypoosmotic) solution:
a. Water moves through the plasma membrane into the cell, sometimes causing
osmotic lysis
b. The cell undergoes plasmolysis
c. Water moves through the plasma membrane out of the cell
d. There is no net movement of water either into or out of the cell
e. None of the above describes what happens in a hypotonic solution
- Ans - A
All of the following are TRUE of competitive inhibition of enzymes EXCEPT:
a. The inhibitor competes with the substrate for the enzyme's active site
b. In the presence of the inhibitor, the enzyme reaction is less likely to occur
c. The inhibitor competes with the substrate for the enzyme's allosteric site
d. The inhibitor is similar enough in structure to the substrate tobind to the enzyme's
active site
e. None of the above are true of competitive inhibition of enzymes
- Ans - c
All of the following are true EXCEPT:
a. In biological oxidation reactions, the organic molecule receives electrons from a
carrier molecule
b. Energy released through biological oxidation reactions can be trapped and stored in
ATP
c. ATP can be generated by substrate level, oxidative, or photophosphorylation
d. Catabolic (breakdown) and anabolic (synthesis) reactions are "coupled" by ATP
e. None of the above (All are true)
- Ans - A
The complete aerobic respiration of glucose yields far more energy stored in ATP than
glycolysis alone for all ofthe following reasons EXCEPT:
a. Krebs cycle generates some additional ATP through substrate- level phosphorylation
b. Glycolysis only partially oxidizes the glucose molecule to pyruvic acid
, c. Electron transport chain (terminal respiratory pathway) produces many ATPs through
oxidative phosphorylation using electron carrier molecules (NADH and FADH2)
d. Krebs cycle generates reduced electron carrier molecules (NADH and FADH2)
e. None of the above (All are reasons that aerobic respiration yields more energy than
glycolysis alone)
- Ans - E
Without using oxygen, some microorganisms can convert pyruvic acid to a variety of
end-products such as ethyl alcohol, lactic acid, acetic acid, and butyric acid. This
process is called:
a. Photosynthesis
b. Fermentation
c. Respiration
d. Glycolysis
e. None of the above
- Ans - B
Which of the following is NOT true of photosynthesis?
a. The light-independent ("dark") reaction makes glucose from carbon dioxide (CO2)
and water, using energy trapped by the light-dependent reaction
b. Light-excited electrons in chlorophyll provide the energy for ATP production
c. The light-independent ("dark") reaction converts light energy to chemical energy
stored in ATP
d. The light-dependent reaction captures electrons in NADPH, which are used for
glucose synthesis in the light-independent ("dark") reaction
e. None of the above (all are true of photosynthesis)
- Ans - C
Which of the following is NOT correctly matched?
a. Capnophile - microbe requiring a reduced-concentration CO2 environment for optimal
growth
b. Halophile - microbe that grows best in an environment with high osmotic pressure
c. Agar - complex polysaccharide from seaweed used as a solidifying agent in culture
media
d. Colony - a population of microbial cells arising from a single cell or spore or from a
group of attached cells
e. None of the above (All are correctly matched)
- Ans - A
Which of the following is NOT correctly matched?
a. Pasteurization - heating at 72o C for 15 seconds to kill pathogenic (disease- causing)
microbes
b. Bacteriostasis - killing living bacteria
