UExcel Microbiology Test 2

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Which of the following organisms is transmitted by the Tsetse fly?

Correct! Wrong!

Explanation:
Tsetse flies are the main carriers of African trypanosomes, which cause human and animal trypanosomiasis in 36 countries in Sub-Saharan Africa. These flies have formed symbiotic relationships with bacterial and viral microbes as well.

Which of the following symptoms is not associated with Haemophilus influenzae?

Correct! Wrong!

Explanation:
Malaria is caused by neither a virus nor a bacteria. Malaria is caused by the Plasmodium parasite, which is spread by infected mosquitoes. A mosquito feeds on Plasmodia infected blood.

Which of the following is not connected to fungi?

Correct! Wrong!

Explanation:
Chlamydiae are bacteria that only live inside cells. They lack a number of metabolic and biosynthetic pathways and must rely on the host cell for intermediates, such as ATP. Chlamydiae is divided into two stages: infectious particles known as elementary bodies and intracytoplasmic reproductive forms known as reticulate bodies.

A RNA virus is which of the following?

Correct! Wrong!

Explanation:
A herpes virus with DNA as its genetic material that causes herpes infections. Human herpesviruses are divided into two kinds. Cold sores on the lips or nose are caused by type 1 virus infections. Sores on the genitals are caused by type 2 virus infections (external and internal sex organs and glands).

Which of the following organisms is transmitted by the Ixodes tick?

Correct! Wrong!

Explanation:
Babesiosis is an infectious disease caused by protozoa of the genus Babesia that is primarily spread by tick vectors. Blood transfusions, organ transplants, and congenital transmission are extremely rare. Babesia protozoa infect animals, causing red blood cell lysis.

Which of the viruses listed below is not a single-strand linear RNA virus?

Correct! Wrong!

Explanation:
Bunyaviridae are spherical, enclosed RNA viruses that are transmitted by arthropods or rodents. Bunyaviruses cause a variety of febrile illnesses in humans and other animals. They either have a rodent or an arthropod vector and a vertebrate host.

A DNA virus is which of the following?

Correct! Wrong!

Explanation:
Caliciviruses are small, non-enveloped RNA viruses with cup-shaped depressions on a spherical capsid surface, hence their name, which comes from calyx, which means chalice.

Which of the following bacteria has not been associated to urinary tract infections?

Correct! Wrong!

Explanation:
Gram-negative coccobacilli have ultrastructural characteristics comparable to other dangerous bacteria. Hemin (factor X) and NAD+ (factor V) are required for the growth of Haemophilus influenzae. Other Haemophilus species grow on blood agar because they just need NAD+ to survive.

Which of the viruses below is not a double-strand linear DNA virus?

Correct! Wrong!

Explanation:
Papovaviruses are icosahedral viruses with circular, double-stranded DNA that are tiny and non-enveloped.

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