Exam 31: Fungi

Figure 31.1 below depicts the outline of a large fairy ring that has appeared overnight in an open meadow, as viewed from above. The fairy ring represents the furthest advance of this mycelium through the soil. Locations A-D are all 0.5 meters below the soil surface. Responses may be used once, more than once, or not at all. -If Penicillium typically secretes penicillin without disturbing the lichen relationship in which it is engaged, then what must have been True about its partner?

Which of the following is a characteristic of hyphate fungi (fungi featuring hyphae)?

Figure 31.1 below depicts the outline of a large fairy ring that has appeared overnight in an open meadow, as viewed from above. The fairy ring represents the furthest advance of this mycelium through the soil. Locations A-D are all 0.5 meters below the soil surface. Responses may be used once, more than once, or not at all. -At which location is the mycelium currently absorbing the most nutrients per unit surface area, per unit time?

The following questions are based on the description below. Rose-picker's disease is caused by the yeast, Sporothrix schenkii. The yeast grows on the exteriors of rose-bush thorns. If a human gets pricked by such a thorn, the yeasts can be introduced under the skin. The yeasts then assume a hyphal morphology and grow along the interiors of lymphatic vessels until they reach a lymph node. This often results in the accumulation of pus in the lymph node, which subsequently ulcerates through the skin surface, and drains. -Say S. schenkii had initially been classified as a deuteromycete. Asci were later discovered in the pus that oozed from an ulcerated lymph node, and the spores therein germinated, giving rise to S. schenkii yeasts. Which two of these are conclusions that make sense on the basis of this information? 1) S. schenkii produces asexual spores within lymph nodes. 2) S. schenkii should be reclassified. 3) S. schenkii continues to have no known sexual stage. 4) The hyphae growing in lymphatic vessels probably belonged to a different fungal species. 5) S. schenkii yeasts belonging to two different mating strains were introduced by the same thorn prick.

In which phylum are mushrooms and toadstools classified?

What are the sporangia of the bread mold Rhizopus?

Please refer to the following information to answer the following questions. Diploid nuclei of the ascomycete Neurospora crassa contain 14 chromosomes. A single diploid cell in an ascus will undergo one round of meiosis, followed in each of the daughter cells by one round of mitosis, producing a total of eight ascospores. -What is the ploidy of a single mature ascospore?