Microbiology Worksheet 15

Which of the following may be added to normal media to make it more selective for staphylococci?

7.5% salt

Which of the following virulence factors used by Staphylococcus puts holes in host cells?

Alpha toxin

Which is considered the most serious staphylococcal skin infection?

Carbuncles

What is eschar (a sign of cutaneous anthrax)?

Dead tissue resembling a flat scab

The varicella-zoster virus is a member of which virus family?

Herpesviridae

An important diagnostic sign of measles is

Koplik's spots.

Which of the following is considered a function of the skin?

Production of cytokines Synthesis of vitamin D Regulation of body temperature Prevention of fluid loss

Warts are caused by

papillomaviruses.

The secretions of the sweat and sebaceous glands provide ________ to the microbiota.

water, amino acids, AND lipids

Which of the following organisms is not normally found on the skin?

Candida species

Which of the following may aid Staphylococcus in resisting phagocytosis?

Coagulase

Which of the following is an important function of the skin?

Control body temperature

In S. pyogenes, which of the following interferes with phagocytosis?

M protein

Which of the following normal skin microbiota is a small yeast?

Malassezia species

In which of the following does a rash start on the palms and soles and progress toward the trunk?

Rocky Mountain spotted fever

In addition to S. aureus, impetigo may also involve

S. pyogenes.

Which of the following is true about diphtheroids?

They include Cutibacterium acnes. They are part of the normal microbiota of the skin. They are responsible for body odor.

Complications of measles may include pneumonia and encephalitis.

True

S. aureus clumping factor

causes bacteria to clump together in plasma.

The principal species of Staphylococcus found on the skin is

epidermidis.

The surface layer of the skin is the

epidermis.

The MMR vaccine is used to protect against

measles, mumps, rubella.

The preferred habitat of S. aureus is the

nasal chamber.

The oily secretion that lubricates the hair follicles of the skin is

sebum.

The rubeola virus contains

single-stranded RNA.

Rubella, rubeola, and varicella-zoster are all only acquired via

the respiratory route.

The main vector(s) of Rocky Mountain spotted fever in the western United States is/are ________.

ticks

A common viral rash of childhood with the popular name chickenpox is also known as

varicella-zoster.

Which S. aureus virulence factor is correctly matched with its function?

α-Toxin—makes holes in host cell membranes. Capsule—avoiding phagocytosis. Protein A—interferes with opsonization. Hyaluronidase—facilitates spread in tissues.