MRS Mold Biology & Identification 2

Question 1

Which cellular structure is responsible for producing mold spores asexually?

Accepted Answer

Conidiophore

Answer

Conidiophores are specialized hyphal structures that produce conidia (asexual spores) in many common mold species.

Question 2

What is the primary function of melanin pigment in mold cell walls?

Accepted Answer

Protection against UV radiation and desiccation

Answer

Melanin in mold cell walls provides protection against UV radiation, desiccation, and host immune responses.

Question 3

Which mold genus is characterized by a flask-shaped perithecium as its sexual reproductive structure?

Accepted Answer

Chaetomium

Answer

Chaetomium produces flask-shaped perithecia with characteristic hairy appendages, making it a common indicator of water damage.

Question 4

A mold sample shows hyphae with regular cross-walls dividing the filament into compartments. These walls are called:

Accepted Answer

Septa

Answer

Septa are cross-walls that divide hyphae into separate cells, distinguishing septate fungi from coenocytic (non-septate) fungi.

Question 5

Which of the following describes the 'xerophilic' characteristic of certain mold species?

Accepted Answer

Ability to grow at very low water activity levels

Answer

Xerophilic molds can grow at water activity (aw) levels as low as 0.70–0.75, allowing them to colonize seemingly dry materials.

(MRS) Mold Remediation Specialist Practice Test