Microbiology Exam 1 Updated Actual Questions And Correct Answers

MICROBIOLOGY EXAM 1 UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS

Question 1.
Identify 3 components of both gram positive and negative bacteria.

Correct Answer: -Cell wall -Capsule -Plasma cell membrane


Question 2.
Compare/contrast gram (+) and gram (-) bacteria

Correct Answer: Gram (+) 1. thick peptidoglycan 2. small periplasmic space 3.
Teichoic acid Gram (-) 1. THIN peptidoglycan 2. LPS 3. Porins 4. Large
periplasmic space


Question 3.
Plasmids carry genes for?

Correct Answer: 1. Antibiotic resistance 2. Resistance to heavy metals (Hg, Ag)
3. Resistance to UV light 4. Pili 5. Exotoxins


Question 4.
Bacterial shapes:

Correct Answer: cocci - diplococci (pair) - streptococci - tetrad (4) - staphylococci
- Sarcina (cube of 8)




Question 5.
Bacterial shapes: (Bacilli)

Correct Answer: Rods -chain of bacilli -flagellate rods -spore former

,Question 6.
Bacterial shapes: Spirals

Correct Answer: -Vibrios -Spirilla -Spirochaetes




Question 7.
The shape of a bacterium is determined its _____.

Correct Answer: rigid cell wall by


Question 8.
Smallest and largest bacteria

Correct Answer: Smallest: Mycoplasma Largest: Bacillus anthracis


Question 9.
Bacteria is a prokaryote with the following characteristics : ______

Correct Answer: -no nucleus or membrane-bound organelles -chromosomes and
plasmids freely float in cytoplasm


Question 10.
Function of cells wall

, Correct Answer: • Provides structural support • Made of peptidoglycan
(polysaccharide)


Question 11.
Function of capsule

Correct Answer: Sticky outer layer for protection and attachment


Question 12.
Function of plasma cell membrane

Correct Answer: • Directs what enters and exits • Phospholipid bilayer


Question 13.
Differences in cell walls gram (-) and

Correct Answer: (+)




Question 14.
Gram positive bacteria structure

Correct Answer: • Inner plasma cell membrane (phospholipid bilayer) • Thick
'peptidoglycan' cell wall • Outer Capsule


Question 15.
Gram negative bacteria structure

Correct Answer: • Inner plasma cell membrane (phospholipid bilayer) • Thin
'peptidoglycan' cell wall • Another outer plasma cell membrane (phospholipid
bilayer - 'lipopolysaccharides') • Outer Capsule


Question 16.
Bacteria unlike eukaryotes have no ____ in plasma membrane.

Correct Answer: sterols


Question 17.
Lipopolysaccharide (LPS) is only associated with ______.