Straighterline Microbiology BIO250 Final Proctored Exam R

Straighterline Microbiology BIO250 Final Proctored
Exam Review – DONE APRIL 2025/2026 (QUESTIONS 1
– 60)




Structure of skin

epidermis, dermis, hypodermis

What are the functions of the skin?

protection, vitamin D synthesis, sensation,
thermoregulation, nonverbal communication



Epidermis

Thin outer epithelial layer; contains keratin




Dermis

Thick inner layer with hair follicles, sweat and
oil ducts

,Perspiration

Provides moisture, contains lysozyme and
antimicrobial peptides




Sebum

Lipids, proteins, salt; contains fatty acids that
inhibit microbes; provides nutrients




Vesicle

Small fluid-filled blister




Bullae

Large vesicle (>1 cm)

,Macule

Flat red lesion




Papule

Raised lesion




Pustule

Pus-filled lesion




Coagulase-Negative

Includes Staphylococcus epidermidis, 90% of
normal skin flora, opportunistic pathogen,
biofilm formation on catheters

, Coagulase-Positive

Includes Staphylococcus aureus, highly
virulent, evades immune system, produces
toxins




MRSA

Resistant to methicillin




VRSA

Resistant to vancomycin




Erysipelas

Dermal skin infection caused by Streptococcus
pyogenes