CMA Mold Identification & Types 2 — Questions and Answers
Question 1: Which mold genus is most commonly associated with water-damaged drywall and is often referred to as 'black mold' in public discourse?
- Aspergillus
- Stachybotrys (Correct answer)
- Cladosporium
- Penicillium
Correct answer: Stachybotrys
Stachybotrys chartarum is the species commonly called 'black mold' and thrives on cellulose-rich, water-damaged materials like drywall.
Question 2: What microscopic structure do molds use to reproduce and disperse through the air?
- Hyphae
- Mycelia
- Spores (Correct answer)
- Rhizoids
Correct answer: Spores
Mold reproduces via spores, which are microscopic particles that become airborne and germinate when they land on suitable moist surfaces.
Question 3: Cladosporium is primarily characterized by what color in culture?
- White to cream
- Olive-green to brown or black (Correct answer)
- Bright orange
- Bright red
Correct answer: Olive-green to brown or black
Cladosporium typically appears olive-green to brown or black and is one of the most common outdoor and indoor mold genera.
Question 4: Which characteristic best distinguishes Aspergillus from Penicillium under a microscope?
- Aspergillus has a brush-like conidiophore (penicillus), Penicillium has a globose vesicle
- Aspergillus has a globose vesicle (conidial head), Penicillium has a brush-like conidiophore (Correct answer)
- Both have identical conidiophore structures
- Aspergillus produces only black spores
Correct answer: Aspergillus has a globose vesicle (conidial head), Penicillium has a brush-like conidiophore
Aspergillus is identified by its vesicle (swollen tip) on the conidiophore, while Penicillium has a brush-like branching structure called a penicillus.
Question 5: Alternaria is commonly found in which indoor environment?
- Swimming pools
- Air conditioning drip pans
- Shower tiles and window frames (Correct answer)
- Attic insulation
Correct answer: Shower tiles and window frames
Alternaria frequently colonizes bathroom shower tiles, window frames, and other surfaces with recurring moisture exposure.
Question 6: What term describes the visible mass of fungal hyphae that forms the body of a mold colony?
- Conidium
- Mycelium (Correct answer)
- Sporangium
- Basidium
Correct answer: Mycelium
The mycelium is the network of branching hyphae that constitutes the vegetative body of a mold colony.
Question 7: Which mold genus is known for producing blue-green colonies and is a source of the antibiotic penicillin?
- Trichoderma
- Fusarium
- Penicillium (Correct answer)
- Mucor
Correct answer: Penicillium
Penicillium produces blue-green colonies and was the original source of penicillin, discovered by Alexander Fleming.
CMA Mold Identification & Types 2
Which mold genus is most commonly associated with water-damaged drywall and is often referred to as 'black mold' in public discourse?