2024/2025 MICROBIOLOGY
LABORATORY EXAM QUIZ 1
Diplococcus - ANSWER>>>Round bacterium that typically occurs in pairs of two joined cells
Examples include Streptococcus pneumoniae and Neisseria spp.
Coccobacillus - ANSWER>>>Intermediate shape between coccus and bacillus
Examples include Haemophilus influenzae and Chlamydia trachomatis.
Streptococci - ANSWER>>>Aggregation of coccoid bacteria that appear as bead-like chains
An example of this is Streptococcus spp
Staphylococci - ANSWER>>>Aggregations of coccoid baceria that appear as grape-like clusters
Example of this is Staphylococcus spp.
Antigen in cell wall of G+ bacteria - ANSWER>>>Lipoteichoic acid
Induces TNF and IL-1
Peptidoglycan structure and function - ANSWER>>>Sugar backbone with peptide chains cross-linked by
transpeptidase
Provides rigid support and protects against osmotic pressure
Periplasm - ANSWER>>>Space between inner and outer membranes in G- bacteria
Bacterial ribosomal subunits - ANSWER>>>50S and 30S = 70S
Glycocalyx - ANSWER>>>Loose network of polysaccharides that mediates adherence to surfaces,
especially foreign surfaces such as indwelling catheters.
Role of capsule in bacteria - ANSWER>>>Prevent phagocytosis by immune cells
Quellung reaction - ANSWER>>>Capsular antigens are species specific. Antibody attachment to the
capsule causes the capsule to swell. This is a useful method of bacterial identification called the quellung
reaction.
Catalase-positive bacteria examples - ANSWER>>>Cats Need PLACESS to hide
Nocardia
Pseudomonas
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