26 terms

Microbiology Short Quizzes (Unit 1)

Which microscope is used to see detail of a 300-nm virus?
electron microscope
Which of the following organelles most closely resembles a prokaryotic cell?
A. cell wall
B. mitochondrion
C. nucleus
D. vacuole
E. golgi complex
B. Mitochondrion
Which of the following is NOT equal to 1 mm?
A) 0.001 m
B) 10-3 m
C) 10 6 nm
D) 0.1 cm
E) 100 μm
E) 100 μm (it would be 1000 μm)
Which of the following structures is NOT found in some prokaryotic cells?
A) pilus
B) axial filament
C) peritrichous flagella
D) cilium
E) flagellum
D) cilium
A student is looking at a bacterial specimen using the oil immersion lens, but has forgotten to put immersion oil on the slide. The specimen will appear
somewhat fuzzy and have poor resolution.
The purpose of the ocular lens is to
magnify the image from the objective lens.
Which type of stain is most useful in helping clinicians to decide which antibiotic to prescribe for a bacterial infection?
gram stain
Which microscope uses 2 beams of light to produce a 3-D color image?
DIC microscope
Which step in the Gram stain is the critical step in differentiating gram-positive cells from gram-negative cells?
(alcohol wash)
Where are phospholipids most likely found in a eukaryotic cell?
the plasma membrane, around organelles, and surrounding flagella
Assume you stain Bacillus by applying malachite green with heat and then counterstaining with safranin. Through the microscope, the green structures are
Antibiotics that target cell wall synthesis ultimately cause bacterial cell death as a result of...
osmotic lysis.
What cell wall (gram + or -) is resistant to many antibiotics like penicillin?
gram-negative (because it has two membranes)
In using what microscope does the observer NOT look directly at an image through a lens?
Electron microscope
(or sound)
Place the following steps in the correct sequence.
2-Making a smear
(make smear, fix, stain)
Recombinant DNA technology has become an increasingly important part of our life. It is used for all of the following EXCEPT:
A) drug production
B) vaccine production
C) synthesis of water
D) increasing nutritional value of food
E) enhancing food longevity
C) synthesis of water
Radioisotopes are frequently used to label molecules in a cell. The fate of atoms and molecules in a cell can then be followed. Assume Saccharomyces cerevisiae is grown in a nutrient medium containing the radioisotope 35S. After a 48-hour incubation, the 35S would most likely be found in the S. cerevisiae's
LOOK UP ANSWER. (not nucleic acids)
either proteins, lipids, water, or carbohydrates
The formal system for classifying and naming organisms was developed by
Carolus Linnaeus
Normal microbiota are typically found in and on all the following body locations EXCEPT the
A) upper respiratory system
B) mouth
C) colon
D) skin
E) blood
NOT A!!!!
If you viewed one single protein using a microscope, you would observe multiple _____ structures.
A) primary
B) secondary
C) tertiary
D) primary and secondary
E) secondary and tertiary
NOT D!!!
Which of the following findings was essential for Edward Jenners vaccination process?
Exposure to a milder disease form may produce immunity.
Which type of molecule NEVER contains a phosphate group?
A) nucleic acid
B) lipid
D) triglycerides
D. triglycerides
Which molecule is composed of a chain of amino acids?
The major food producers for other living organisms is/are
A) higher plants.
B) cyanobacteria.
C) algae.
D) higher plants and algae.
E) higher plants, cyanobacteria, and algae.
E) higher plants, cyanobacteria, and algae
Which of the following statements is false?
A) Water is a part of a dehydration synthesis reaction.
B) Salts readily dissolve in water.
C) Water molecules are formed by hydrolysis.
D) Water is a polar molecule.
E) Water freezes from the top down.
C) Water molecules are formed by hydrolysis.
Microorganisms are essential to our life. Each of the following is an example of a beneficial function of microorganisms EXCEPT
A) increased morbidity.
B) gene therapy.
C) bioremediation.
D) alternative fuel production.
E) agriculture.
A) increased morbidity.