‫وزارة التعليم العالي‬
‫جامعة المجمعة‬
‫كلية العلوم الطبية التطبيقية‬
‫قسم علوم المختبرات الطبية‬
Ministry of Higher Education
Majmaah University
College of Applied Medical Sciences
Department of Medical Laboratory
lecture 3
Name of Instructor: Dr. Mosaab Omar
Location: Majmaah male campus
MCQ:
Please find the proper answer of the following:
The period between inoculation of bacteria in a culture medium and beginning
of multiplication is known as
A.
stationary phase
B.
log phase
C.
lag phase
D.
decline phase.
Exponential phase of growth curve of bacteria is of limited duration because of
A.
rise in cell density
B.
accumulation of toxic metabolites
C.
exhaustion of nutrients
D.
all of these
The growth is normally expressed as __________ in turbidimetric measurement
A.
cells per ml
B.
cfu/ml
C.
optical density
D.
mg N2 /ml
Which of the following is the best definition of generation time?
A. The length of time it takes for lag phase.
B.The length of time it takes for a population of cells to double.
C. The maximum rate of doubling divided by the initial count.
D. The duration of log phase.
E. The time it takes for nuclear division.
The generation time of a culture that produces two generations per hour is
A.
greater than that produces three generations per hour
B.
lesser than that produces three generations per hour
C.
equal to that produces three generations per hour
D.
none of the above
1
Bacteria and fungi multiply best
A.
below 16°C
B.
between 16-38°C
C.
above 38°C
D.
none of these
The term obligate anaerobe refers to an organism that
A.
doesn't use oxygen but tolerates it
B. is killed by oxygen
C. uses oxygen when present or grows without oxygen when oxygen is absent
D. prefers to grow without oxygen.
The term aerotolerant anaerobe refers to an organism that
A.
doesn't use oxygen but can grow in the presence of oxygen
B.
is killed by oxygen
C.
requires less oxygen than is present in air
D.
prefers to grow without oxygen
The microorganisms that grow best in a low-oxygen environment is called a /(n)
A.
aerobe
B.
anaerobe
C.
facultative
D.
microaerophile
An organism is completely dependent on atmospheric O2 for growth. This
organism is
A. osmotolerant
B. acidophile
C. facultative anaerobe
D. obligate aerob
The term facultative anaerobe refers to an organism that
A.
doesn't use oxygen but tolerates it
B.
is killed by oxygen
2
C.
D.
uses oxygen when present or grows without oxygen when absent
requires less oxygen than is present in air.
3