Microbio Lab Midterm Exam Review

What organism is shown?

Strongyloides stercoralis larvae

Which organism causes amoebic dysentery?

Entamoeba histolytica

Which stage of Entamoeba histolytica is acquired through contaminated food or water?

Cyst

Which symptoms are listed for amoebic dysentery?

Abdominal pain, diarrhea, blood and mucus in feces, nausea, vomiting, and hepatitis

Where is Entamoeba histolytica found according to the chart?

Feces

Giardia lamblia causes which disease?

Giardiasis

Which Giardia stage is the transmissible form acquired from water?

Cyst

Which Giardia stage is the active form shown in the chart?

Trophozoite

Which symptoms are listed for giardiasis?

Diarrhea, dehydration, abdominal pain

Plasmodium species cause which disease?

Malaria

The chart describes Plasmodium as being found where?

Inside red blood cells

What is the listed source of Plasmodium infection?

Bite of an Anopheles mosquito

Which symptoms are listed for malaria?

Anemia and spleen and liver damage

Trypanosoma species are associated with which disease in the chart?

African sleeping sickness

Which vector transmits African sleeping sickness in the chart?

Tsetse fly

Which Trypanosoma stage is viewed on the slide?

Trypomastigote

Trichomonas vaginalis causes which disease?

Trichomoniasis

Which physical feature is noted for Trichomonas vaginalis?

Flagella

What is the listed source of Trichomonas vaginalis?

Sexual intercourse

Which specimen is listed for finding Trichomonas vaginalis?

Genital discharge

Taenia saginata is the beef tapeworm. What disease does it cause?

Taeniasis

Which structures are noted for the adult scolex of Taenia saginata and Taenia solium?

Hooks and suckers

How is Taenia infection acquired according to the chart?

Ingestion of contaminated pork or beef

Which Taenia stage is shown with radial spines?

Ova (egg)

Which organism is associated with schistosomiasis?

Schistosoma mansoni

What distinguishing feature is noted for Schistosoma mansoni?

Lateral spine

How is schistosomiasis acquired according to the chart?

Swimming in water with infected host snails

Which symptoms are listed for schistosomiasis?

Vesicles (raised lesions filled with clear fluid)

Strongyloides stercoralis causes which disease?

Strongyloidiasis

What is the source of Strongyloides infection listed in the chart?

Juveniles penetrate skin from soil

Which symptoms are listed for Strongyloides stercoralis?

Itching, chest pain, abdominal pain, diarrhea

Enterobius vermicularis is also known as what?

Human pinworm

Which disease is caused by Enterobius vermicularis?

Enterobiasis

How does the chart describe transmission of Enterobius vermicularis?

Ingestion of pinworm eggs on hands or fomites

What is the listed method for testing for pinworm?

Sticky tape test to anus

Which symptom is specifically listed for enterobiasis?

Perianal itching

Identify the organism shown

Giardia lamblia trophozoite

Identify the organism shown

Entamoeba histolytica

Identify the organism shown

Plasmodium species

Identify the helminth structure shown

Taenia saginata adult scolex

Which taenia species only has four prominent muscular suckers?

Taenia saginata scolex

Which taenia species has four muscular suckers and a double crown of hooks?

Taenia solium scolex

Identify the helminth structure shown

Taenia solium adult scolex

Identify the organism shown

Trichomonas vaginalis

Identify the structure shown

Taenia egg with radial spines

Identify the structure shown

Schistosoma mansoni egg with lateral spine

Identify the structure shown

Enterobius vermicularis egg

Identify the structure shown

Toxoplasma gondii

Identify the trematode structure shown

Schistosoma mansoni flatworm

Identify the nematode structure shown

Ascaris lumbricoides egg

Identify the amoeba structure shown

Entamoeba histolytica

This organism is a protozoan that uses flagella to move, identify the structure shown.

Giardia lamblia

Identify the organism shown

Trypanosoma gambiense

Identify the organism shown

Trichomonas vaginalis

Identify the gram stain shown

Staphylococcus aureus

Identify the gram stain shown

Escherichia coli

This method is used to isolate and separate mixed cultures. It does so by decreasing the cell density until you can see individual colonies CFU (colony forming unit) that arose from an individual cell. Which method is this?

Quadrant streak plate method

Identify the type of stain shown

Acid fast stain

Identify the type of stain shown

Endospore stain

Identify the type of stain shown

Negative stain

Identify the organism shown

Capsules

Identify the structure shown

Penicillium

Identify the structure shown

Aspergillus

Identify the structure shown

Penicillium

Identify the structure shown in A

Candida albicans

Identify the structure shown in C

Aspergillus niger

Identify the cultures shown

Serratia marcescens and Escherichia coli

Identify the structure shown

Trypanosoma rhodesiense

Identify the roundworm shown

Ascaris lumbricoides

Which component is located under the stage and collects and directs light?

Condenser

Which microscope component is the horizontal platform that supports the slide?

Stage

Which microscope component controls the amount of light?

Diaphragm

What is the maximum magnification generally given for light microscopes in the review?

1,300X

What is the best resolution stated for visible light?

0.2 µm

According to the general rule in the review, viruses are measured in:

nm

According to the general rule in the review, prokaryotes are measured in:

µm

According to the general rule in the review, helminths are measured in:

mm

What part of a chromogen gives it color?

Chromophore

What charged portion of a chromogen allows it to bind to a microbial cell and makes it a dye?

Auxochrome

Which of the following is a basic stain listed in the review?

All the above

Which is NOT described as an effect of heat fixing?

Prevents all cell distortion

A spherical bacterial cell is called a:

Coccus

A rod-shaped bacterial cell is called a:

Bacillus

Pairs of cocci are called:

Diplococci

Chains of cocci are called:

Streptococci

Clusters of cocci are called:

Staphylococci

Groups of four bacterial cells are called:

Tetrads

Cubelike groups of eight bacterial cells are called:

Sarcinae

Which term describes a comma-shaped bacterial form in the review?

Vibrio

Which term describes a spiral bacterial form listed in the review?

Spirillum

Which bacterial form is described as a flexible spiral?

Spirochete

Which arrangement describes chains of rods?

Streptobacilli

Which organism is identified as the Chinese liver fluke?

Clonorchis (Opisthorchis) sinensis

Which organism is identified as the lung fluke?

Paragonimus westermani

Which organism is identified as the blood fluke?

Schistosoma mansoni

Which disease is caused by Schistosoma mansoni according to the review?

Schistosomiasis

Which geographic areas are listed for Schistosoma mansoni?

Brazil, Caribbean islands, Africa, and the Middle East

Which exposure is associated with Schistosoma mansoni transmission in the review?

Fecally contaminated water

How do Schistosoma mansoni juveniles enter the host?

They enter through the skin into venules of the intestines

Where are Schistosoma mansoni eggs diagnosed according to the review?

Feces