BI 234 EXAM 1 QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS GRADED A++ LATEST
UPDATE
A major milestone in the history of microbiology was the development of the
"germ theory of disease" in 19th
century Europe. Which of the following is NOT a true statement about this
theory?
a. It said that diseases of people and other animals could be caused by living
organisms too small to be seen
with the unaided eye
b. It arose partly from observations about bacterial contamination of fermentation
processes in beer and wine
c. It confirmed the long-held belief that diseases arise from spiritual causes,
miasmas, and/or vapors
d. It led to the development of infection control practices including aseptic
surgery
e. None of the above (All are true statements about the germ theory of disease)
C
From the information given below, what is the molecular weight of the amino acid
alanine, C3H7NO2?
,a. 89 b. 75 c. 41 d. 48 e. Correct answer not given
Element Symbol No. Protons No. Neutrons
Hydrogen H 1 0
Oxygen O 8 8
Carbon C 6 6
Nitrogen N 7 7
Sulfur S 16 16
A. Molecular weight is protons+neutrons
You observe a cell through a microscope and see that it has mitochondria. To
which Domain of
organisms does it belong?
a. Bacteria b. Archaea c. Animalia (Animals) d. Eukarya
e. Cannot be determined from the information provided
D. Eukarya consist of animals, plants, fungi and protists
Which of the following is NOT 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 weaker than covalent bonds
d. They are stronger than hydrogen bonds
e. None of the above (all of the above are true of ionic bonds)
B. Ionic bonds are formed when atoms gain or lose electrons in the outer energy level
Which of the following statements is NOT true of biological organic molecules?
a. They're usually polymers formed from subunits (monomers)
, b. Monomers are linked (bonded) together by hydrolysis ("water splitting")
c. Always contain hydrogen and carbon
d. Their atoms are mostly or entirely covalently bonded
e. None of the above (i.e., all of the above are true)
B. Hyrdrolysis is a decomposing reaction
Which of the following statements is NOT true?
a. Decomposition (degradation, catabolic) reactions are usually endergonic
b. Enzymes increase the probability that a chemical reaction will take place by
lowering the activation energy
c. Chemical reactions in living cells are catalyzed by enzymes
d. The energy required to cause a chemical reaction to occur is called the
activation energy
e. None of the above (all of these statements are true)
A. Decomposition reactions are usually exergonic, releasing energy
If a bacterial cell is placed in a hypertonic (hyperosmotic) solution:
a. Water moves through the plasma membrane into the cell
b. The cell undergoes osmotic lysis
c. Water moves through the plasma membrane out of the cell, causing
plasmolysis
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 hypertonic solution
C.
COMPLETE SOLUTIONS GRADED A++ LATEST
UPDATE
A major milestone in the history of microbiology was the development of the
"germ theory of disease" in 19th
century Europe. Which of the following is NOT a true statement about this
theory?
a. It said that diseases of people and other animals could be caused by living
organisms too small to be seen
with the unaided eye
b. It arose partly from observations about bacterial contamination of fermentation
processes in beer and wine
c. It confirmed the long-held belief that diseases arise from spiritual causes,
miasmas, and/or vapors
d. It led to the development of infection control practices including aseptic
surgery
e. None of the above (All are true statements about the germ theory of disease)
C
From the information given below, what is the molecular weight of the amino acid
alanine, C3H7NO2?
,a. 89 b. 75 c. 41 d. 48 e. Correct answer not given
Element Symbol No. Protons No. Neutrons
Hydrogen H 1 0
Oxygen O 8 8
Carbon C 6 6
Nitrogen N 7 7
Sulfur S 16 16
A. Molecular weight is protons+neutrons
You observe a cell through a microscope and see that it has mitochondria. To
which Domain of
organisms does it belong?
a. Bacteria b. Archaea c. Animalia (Animals) d. Eukarya
e. Cannot be determined from the information provided
D. Eukarya consist of animals, plants, fungi and protists
Which of the following is NOT 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 weaker than covalent bonds
d. They are stronger than hydrogen bonds
e. None of the above (all of the above are true of ionic bonds)
B. Ionic bonds are formed when atoms gain or lose electrons in the outer energy level
Which of the following statements is NOT true of biological organic molecules?
a. They're usually polymers formed from subunits (monomers)
, b. Monomers are linked (bonded) together by hydrolysis ("water splitting")
c. Always contain hydrogen and carbon
d. Their atoms are mostly or entirely covalently bonded
e. None of the above (i.e., all of the above are true)
B. Hyrdrolysis is a decomposing reaction
Which of the following statements is NOT true?
a. Decomposition (degradation, catabolic) reactions are usually endergonic
b. Enzymes increase the probability that a chemical reaction will take place by
lowering the activation energy
c. Chemical reactions in living cells are catalyzed by enzymes
d. The energy required to cause a chemical reaction to occur is called the
activation energy
e. None of the above (all of these statements are true)
A. Decomposition reactions are usually exergonic, releasing energy
If a bacterial cell is placed in a hypertonic (hyperosmotic) solution:
a. Water moves through the plasma membrane into the cell
b. The cell undergoes osmotic lysis
c. Water moves through the plasma membrane out of the cell, causing
plasmolysis
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 hypertonic solution
C.
