MICROBIO QUIZ #1

Randy, a college student, was experiencing sore throat and high fever for 3 days.  He was diagnosed with Strep throat which is caused by the pathogen Streptococcus pyogenes.  He was prescribed with Amoxicillin for 1 week.  After the treatment was completed, his symptoms resolved.  He was currently taking microbiology and has recently learned that streptococci are gram-positive bacteria.  What do you think is the mechanism how the antibiotic worked for his condition?

• Streptococci have cell walls made up of thick peptidoglycan and the antibiotic disrupted the bacteria’s cell wall synthesis.

• Streptococci have cell wall made up of a waxy substance called mycolic acid which was easily destroyed by the antibiotic.

• Streptococci do not contain cell wall that is why the antibiotic worked on the bacteria.

• The bacteria have outer membrane that contains lipopolysaccharide.

Which of the following is NOT involved in the DNA transcription in bacteria?

• DNA template

• mRNA

• tRNA

• DNA polymerase

Term used to describe bacteria with tuft of flagella at one end.

• lophotrichous

• amphitrichous

• peritrichous

• atrichous

This bacterial structure is made up of polysaccharide that functions to prevent phagocytosis and thus contribute to its virulence.

• capsule

• spore

• plasmid

• metachromatic granules

This is the part in the bacterial cell which is the site of almost all metabolic processes.

• cell membrane

• cytoplasm

• mitochondrion

• ribosome

Raw food can still harbor resistant microorganisms even if it was allowed to boil for 30 minutes because of the presence of this structure.

• endospore

• flagella

• pili

• cell wall

This is the metabolic pathway in the cell that generates the greatest amount of ATP.

• Electron transport chain

• Pentose Phosphate Pathway

• Embden-Meyerhof-Parnas Pathway

• Kreb’s cycle

Under the 5-Kingdom System of Classification, what domain are bacteria classified?

• prokaryotae

• protista

• animalia

• fungi

A 50-year old man was admitted to the hospital due to respiratory distress which started with fever, non-productive cough and easy fatigability 4 days ago.  On gram staining, purple, rod-shaped bacteria arranged in chains were seen and later on identified as Bacillus anthracis. These descriptions about the bacteria are examples of

• phenotypic characteristics

• genotypic characteristics

• physiologic characteristics

• binomial system of nomenclature

Which of the following is TRUE regarding prokaryotes?

• The number of mitochondria in a cell varies greatly depending on the activities required of that cell.

• Bacteria’s cell membranes are enclosed by envelopes.

• Prokaryotes either contain DNA or RNA.

• Plasmids are linear molecules of double-stranded DNA that can be found in bacteria.