STRAIGHTERLINE MICROBIOLOGY 2026
ACTUAL EXAM PAPER QUESTIONS WITH
SOLUTIONS GRADED A+
◉The two major groups of helminths are the ______ and the ______.
Answer: roundworms; flatworms
◉Which of the following is not true of conjugation?
a. Involves direct contact between cells
b. Transfers genes for drug resistance
c. Transfers genes for enzymes and adherence molecules
d. Involves the action of bacteriophage
e. The donor retains a copy of the transferred genes Answer:
Involves the action of bacteriophage
◉Which of the following properties is likely to be found in a pioneer
colonizer of a biofilm on an artificial joint implant? Answer: Surface
structures for attaching to tissue
◉A bacterium is inoculated into a tube of thioglycollate and
incubated. After incubation, turbidity appears throughout, top to
,bottom, with the greatest turbidty at the very top. This bacterium
would be called a(n) ______. Answer: facultative anaerobe
◉An organic nutrient that cannot be synthesized by the organism
and must be provided is called a(n) ______. Answer: growth factor
◉Humans can see objects as small as 0.1 mm. Leeuwenhoek's best
microscope could magnify objects to 300X. Which of the following
would be invisible using Leeuwenhoek's microscope? Answer:
Poliovirus, 30 nm
◉Which of the following is not associated with every virus?
a. Envelope
b. Capsomeres
c. Capsid
d. Nucleic acid
e. Genome Answer: Envelope
◉A diagram of the three domains (Bacteria, Archaea, Eukarya)
proceeding from the Last Universal Common Ancestor would show
Archaea Answer: branching off the Domain Eukarya.
◉During aerobic cellular respiration, the final electron acceptor is
______. Answer: oxygen
, ◉The endosymbiotic theory has been developed to explain the
emergence of ______. Answer: eukaryotes
◉Which of the following is a unique characteristic of viruses that
distinguishes them from the other major groups of microorganisms?
a. Cause human disease
b. Lack a nucleus
c. Cannot be seen without a microscope
d. Contain genetic material
e. Lack cell structure Answer: Lack cell structure
◉What type of mutation alters the base but not the amino acid being
coded for? Answer: Silent
◉The eukaryotic cell organelle that most resembles a bacterial cell
is the ______. Answer: mitochondrion
◉Koch's postulates are criteria used to establish that Answer:
specific microbe is the cause of a specific disease
◉The study of evolutionary relationships among organisms is called
______. Answer: phylogeny
ACTUAL EXAM PAPER QUESTIONS WITH
SOLUTIONS GRADED A+
◉The two major groups of helminths are the ______ and the ______.
Answer: roundworms; flatworms
◉Which of the following is not true of conjugation?
a. Involves direct contact between cells
b. Transfers genes for drug resistance
c. Transfers genes for enzymes and adherence molecules
d. Involves the action of bacteriophage
e. The donor retains a copy of the transferred genes Answer:
Involves the action of bacteriophage
◉Which of the following properties is likely to be found in a pioneer
colonizer of a biofilm on an artificial joint implant? Answer: Surface
structures for attaching to tissue
◉A bacterium is inoculated into a tube of thioglycollate and
incubated. After incubation, turbidity appears throughout, top to
,bottom, with the greatest turbidty at the very top. This bacterium
would be called a(n) ______. Answer: facultative anaerobe
◉An organic nutrient that cannot be synthesized by the organism
and must be provided is called a(n) ______. Answer: growth factor
◉Humans can see objects as small as 0.1 mm. Leeuwenhoek's best
microscope could magnify objects to 300X. Which of the following
would be invisible using Leeuwenhoek's microscope? Answer:
Poliovirus, 30 nm
◉Which of the following is not associated with every virus?
a. Envelope
b. Capsomeres
c. Capsid
d. Nucleic acid
e. Genome Answer: Envelope
◉A diagram of the three domains (Bacteria, Archaea, Eukarya)
proceeding from the Last Universal Common Ancestor would show
Archaea Answer: branching off the Domain Eukarya.
◉During aerobic cellular respiration, the final electron acceptor is
______. Answer: oxygen
, ◉The endosymbiotic theory has been developed to explain the
emergence of ______. Answer: eukaryotes
◉Which of the following is a unique characteristic of viruses that
distinguishes them from the other major groups of microorganisms?
a. Cause human disease
b. Lack a nucleus
c. Cannot be seen without a microscope
d. Contain genetic material
e. Lack cell structure Answer: Lack cell structure
◉What type of mutation alters the base but not the amino acid being
coded for? Answer: Silent
◉The eukaryotic cell organelle that most resembles a bacterial cell
is the ______. Answer: mitochondrion
◉Koch's postulates are criteria used to establish that Answer:
specific microbe is the cause of a specific disease
◉The study of evolutionary relationships among organisms is called
______. Answer: phylogeny
