Microbiology Exam 2 practice test questions & Correct Verified Answers
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Course
Microbiology
Institution
Microbiology
Elements that are required in relatively large amounts by microorganisms are called...
A.multivitamins
B. meganurtients
C. macronutrients
D. macromolecules - Correct Answer C. macronutrients
When a microorganism is placed in a(n) ________ solution, water will eneter into the cell and cause...
Microbiology Exam 2 practice test questions &
Correct Verified Answers
Elements that are required in relatively large amounts by microorganisms are called...
A.multivitamins
B. meganurtients
C. macronutrients
D. macromolecules - Correct Answer C. macronutrients
When a microorganism is placed in a(n) ________ solution, water will eneter into the cell and cause it to
burst unless something is done to prevent it.
A. hypotonic
B. isotonic
C. hypertonic
D. osomotic - Correct Answer A. hypotonic
If cells are grown in media containing amino acids labeled with radioactive nitrogen, most of the
radioactivity will be found in the cells...
A. DNA
B. proteins
C. phospholipids
D. DNA and proteins
E. DNa and phosophlipids - Correct Answer D. DNA and proteins
Micooraginams that grow best at temperatures between 45-70 degrees celsius are called:
A. Thermophiles
B. Psycrophiles
C. Thermophobes
D. Mesophiles - Correct Answer A. Thermophiles
, Which of the following is an advantage of the standard plate count?
A. can readily count cells that fomr aggregates
B. determines the number of viable cells
C. can be performed on very dilute samples, such as lake water
D. provides immediate results
E. can be used to count heat-sensitive bacteria - Correct Answer B. determines the number of viable
cells
The total number of viable microorganisms remains constant in stationary phase because:
A. there is a balance between cell division and cell death
B. there is a cessation of cell division even though the cells may remain metabolically activie
C. either a or b
D. niether a or b - Correct Answer C. either a or b
Which of the following is NOT a direct method to measuree microbial growth?
A. direct microscopic count
B. standard plate count
C. filtration on a support membrane followed by incubation on medium
D. metabolic activity
E. most probably number - Correct Answer D. metabolic activity
Media counting some ingredients of unknown chemical composition are called ______ media
A. undefined
B. complex
C. defined
D. synthetic - Correct Answer B. Complex
Which of the following is the best definition of generation time?
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