BIOD171 EXAM QUESTIONS WITH
VERIFIED CORRECT ANSWERS ||
ALREADY GRADED A+ <UPDATED>
Pale red in color and is both selective and differential media. The
presence of crystal violet and bile salts in its formulation restricts gram
positive bacterial growth. AS such, only gra...
Pale red in color and is both selective and differential media. The
presence of crystal violet and bile salts in its formulation restricts gram-
positive bacterial growth. AS such, only gram-negative microbes can be
grown. - ANSWER ✔ Mac Conkey Agar
This Agar is selective for gram-positive bacteria and can differentiate
members of the staph family. - ANSWER ✔ Mannitol Salt Agar
Which of the following reactions is an example of an oxidoreductase?
a. A + B -> A-B
b. A-B + H2O -> A-OH + B-H
c. A-- + B -> A + B--
d. Ab +C -> A + Cb - ANSWER ✔ c. A-- + B -> A + B--
After a microbiologist obtains a quadrant streak sample, what is the next
action taken in the incubation process to obtain growth? - ANSWER ✔
Lids placed back onto the plate, they are inverted to prevent any
potential contaminants from settling onto the surface of the agar and
placed in an incubator set at 37 deg C for ~12-24 hrs.
Which of the following is/are true of Animalia? (Select all that apply)
a. They possess the ability to move.
b. Humans are an example.
,c. They can be unicellular or multicellular.
d. They are autotrophic. - ANSWER ✔ a. They possess the ability to
move.
b. Humans are an example.
A patient presents to the emergency department with severe abdominal
pain after eating a grab-and-go lunch from the local corner store. The
physician suspects foodborne illness to be the cause of discomfort. To
treat the patient, it is essential to know the organism responsible for the
illness. He learns that the organism is identified as a Gram-negative
bacillus. He then orders EMB agar because he suspects E. Coli to be the
cause. If his suspicion is correct, what observation will likely be seen on
the agar plate? - ANSWER ✔ The physician should expect to receive a
report of a distinct metallic green growth pattern growing on the agar.
This will confirm the organism as E. coli.
True or false. If false, make it true.
In addition to being a rich source of carbon and energy, amino acids are
a rich source of nitrogen and sulfur. - ANSWER ✔ True
What STD is caused by gram-negative, non-motile, rod-shaped bacteria
that can cause infertility and pelvic inflammatory disease?
a. Syphilis
b. Leprosy
c. Chlamydia
d. Gonorrhea - ANSWER ✔ c. Chlamydia
What various functions do proteins have in a cell - ANSWER ✔ Proteins
may facilitate the movement of materials in or out of a cell. Some can
act as enzymes that catalyze, or speed up, biochemical processes. Others
play a structural role while other proteins, such as filaments, enable
movement.
, What are the two major types of nucleic acids and their roles? -
ANSWER ✔ There are two major types of nucleic acids: DNA
(deoxyribonucleic acid) and RNA (ribonucleic acid). Nucleic acids are
chemical molecules that carry genetic information within the cell. DNA
contains a vast amount of hereditary information and is responsible for
the inheritable characteristics of living organisms. RNA is responsible
for deciphering the hereditary information in DNA and using it to
synthesize proteins.
What is the plasma membrane, and what is it made up of? - ANSWER
✔ The plasma membrane serves the cell as a surrounding barrier that
separates the inside of the cell from the outside surrounding
environment. The plasma membrane also restricts the movement of
materials (water, nutrients, etc) either in or out of the cell, thus allowing
a cells to absorb and keep what is needed (influx) while also preventing
the escape (out flux) of essential nutrients. The plasma membrane is
composed of lipids (hydrophobic hydrocarbons).
What are the three main components of carbohydrates? - ANSWER ✔
Carbohydrates are composed of carbon, hydrogen and oxygen atoms.
Examples would include, C6H12O6 (glucose) C12H22O11 (sucrose)
and C6H10O5 (cellulose).
What is the primary difference between prokaryotic and eukaryotic
cells? - ANSWER ✔ Eukaryotic cells contain a nucleus, a membrane
enclosed region within the cell that contains the genetic material.
Prokaryotic cells do not have a nucleus and can be further classified as
either Bacteria or Archaea.
What are the main morphologies of bacteria? - ANSWER ✔ Bacteria
can be described as coccus (round/spherical), bacillus (rod), vibrio
(curved rod) or spirillum (spiral/corkscrew).
, Which group (classification) of microbes is noted for its ability to
survive under harsh conditions? - ANSWER ✔ Archaea. They are able
to survive in extremely harsh environmental conditions such as high salt
levels, acid conditions, high temperatures and oxygen-poor conditions.
What are the four main classifications of Eukarya? - ANSWER ✔
Eukaryotic microorganisms are classified as either belonging to
Animalia, Plantae, Fungi or Protista.
Can viruses be classified as either prokaryotic or eukaryotic? -
ANSWER ✔ No. Viruses are considered neither prokaryotic nor
eukaryotic. Viruses are not considered living and do not replicate on
their own, meaning they must replicate within a host.
The lipid bilayer of the plasma membrane is composed of what? -
ANSWER ✔ The cell membrane is a bilayer composed primarily of
amphipathic phospholipids, meaning they contain a polar hydrophilic
(water loving) head group and a non-polar hydrophobic (water fearing)
tail region. The lipid bilayer is situated in such a way where the non-
polar tail groups face inward thus orienting the polar head groups to
interact with water both outside and inside of the cell.
What are the primary cellular organelles described in this module? Be
sure to know the roles of each. - ANSWER ✔ Ribosomes (protein
synthesis), ER (site of protein synthesis), Golgi (protein modification
and distribution), lysosomes (waste disposal), mitochondria (ATP
generation) and chloroplasts (plants only; site of photosynthesis).
What is cellular metabolism? - ANSWER ✔ Metabolism is a controlled
set of biochemical reactions that occur in living organisms in order to
maintain life.
What is the primary function of enzymes, and how are they regulated? -
ANSWER ✔ Enzymes speed up chemical reactions. Most notably, the
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