L34 - General Bacteriology Review Flashcards
A prokaryote is an organism with;
A. No chromosome
B. No nucleus
C. No proteins
D. No nucleic acid
B. No nucleus
Note: All living things have chromosomes; nucleic acid is DNA and RNA
Which of the following is a prokaryote?
A. Bacteria
B. Fungus
C. Protozoa
D. Helminth
A. Bacteria
Note: All the others have a nucleus
Which of the following image is bacteria ?
insert picture
B.
Note: C = has a nucleus; A = a virus (EM)
In general, bacteria has; (can choose multiple answers):
A. Nucleus B. Histones C. Sterol in cell wall D. Chromosome E. Ribosomes F. Membrane bound organelles
D. Chromosome (one small circular chromosome)
E. Ribosomes
Note: Fungus has sterols in their cell wall
Bacteria do NOT have: (can choose multiple answers)
A. Nucleus B. Histones C. Complex cell wall D. Peptidoglycan E. Chromosome F. Ribosomes G. Membrane bound organelles
A. Nucleus
B. Histones
G. Membrane bound organelles
Mycology is the study of:
A. Mycobacterium B. Mycoplasma C. Fungus D. Protozoa E. Virus
C. Fungus
Which of the following is widely used for bacterial phylogenetic analysis?
A. Mitochondrial genes
B. Lysosomal genes
C. Chromosomes
D. DNA coding for ribosomes
D. DNA coding for ribosomes
Note: A common method used for identifying pathogens
Which one of the following is a cell wall component unique to bacteria ?
A. Proteoglycan
B. Peptidoglycan
C. Lipopolysaccharide
D. Mycolic acid
B. Peptidoglycan
Note: Gram - bacteria have Lipopolysaccharide; Mycolic acid is seen only in some bacteria
Choose the correct statement
A. All bacteria have an outer membrane
B. Mycobacteria have lipoplysaccharide
C. Peptidoglycan is present only in Gram positive bacteria
D. Mycobacteria are the only acid fast positive bacteria
E. Teichoic acid is unique to Gram positive
E. Teichoic acid is unique to Gram positive
Note: ONLY Gram - bacteria have an outer membrane. Mycobacteria do not have lipoplysaccharide because they have a Gram + cell wall.
Peptidoglycan is present in ALL bacteria except Mycoplasma.
Mycobacteria are NOT the only acid fast positive bacteria
Identify the mismatched pair
A. Flagella - motility B. Fimbriae - adherence C. Capsule - protect from phagocytosis D. Spores - survival E. Endoflagella - binary fission
E. Endoflagella - binary fission
Note: Endoflagella -helps in motility and is present in Spirochetes
Choose the incorrect statement
A. All fungi are eukaryotes B. Yeasts are fungi C. Hyphae are multicellular D. Dimorphic fungi exist in yeast E. Fungal cell membrane contains sterols F. Fungal cell wall contain peptidoglycan
F. Fungal cell wall contain peptidoglycan
Which of the following is NOT a dimorphic yeast
A. Blastomyces
B. Histoplasma
C. Coccidioides
D. Cryptococcus
D. Cryptococcus
Animal A Brucella titer = 1:256
Animal B Brucella titer = 1:16
Interpretation: Animal A has higher antibodies in the serum than animal B
A. True
B. False
A. True
Choose the incorrect statement regarding antibody titers
A. A positive antibody titer is always diagnostic
B. False positive response can be due to previous exposure or vaccination
C. False negative response can occur in early infection
D. False negative results can occur due to anergy in the late stages of the disease
E. Four fold increase in the convalescent titer is suggestive of an active infection
A. A positive antibody titer is always diagnostic
