Prescott's Microbiology
11th Edition
ISBN: 9781260409062
Author: WILLEY, Joanne
Publisher: MCGRAW-HILL HIGHER EDUCATION
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 25, Problem 4AL
Analysis of sclerotia and conidia formation in the filamentous ascomycete Aspergillus flavus suggests that formation of these structures is cell density dependent. Specifically, high cell density cultures yield conidia, whereas low cell density triggers sclerotia formation. Review the structure and function of conidia and sclerotia, and formulate a hypothesis to explain why their development would be regulated in a density-dependent manner. List several specific testable predictions based on your hypothesis.
Read the original paper: Horowitz-Brown, S., et al. 2008. Morphological transitions governed by density dependence and lipooxygenase activity in Aspergillus flavus. Appl. Environ. Microbiol. 74:5674.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Which of the following statements are correct about nodule formation by Rhizobium species?
P. Nodule formation requires participation of both plant's nodulin genes and rhizobial nodulation genes
Q. Nod factors synthesized by nodulation genes are lipochitin oligosaccharides
R. Infection thread forms during nodule formation is an internal tubular extension of the plasma
membrane that is produced by the fusion of Golgi-derived membrane vesicles
S. Nodule formation in non-leguminous plants is mainly mediated by Rhizobium species
P and Q
P. R and S
F1
P, Q and R
P, Q, R and S
Relate plasmogamy and karyogamy to the process of fertilization and describe whey we need to separate these two things in the life cycle of the fungi.
Differentiate between the monokaryotic and dikaryotic conditions.
Compare and contrast an animal life cycle with that of a typical mushroom including the haplophase, dikaryophase, and diplophase, products of meiosis, plasmogamy, and karyogamy.
In the pictures below, identify the arrowed reproductive structures of microscopic cyanobacteria based on the following descriptions:
Akinetes are dormant structures larger than the vegetative cells, are rich in food reserves, and have thick walls. Most filamentous cyanobacteria develop akinetes in adverse conditions (e.g., winter, dry periods). When favorable conditions return, they germinate and produce new filaments.
Hormogonia are short pieces of filaments consisting of 5–15 trichomes that fragment and develop into new filaments.
Heterocytes (or heterocysts) are multicellular structures that have a thick and massive sheath, formed by members of the Nostocales. It is the location of the enzyme nitrogenase for nitrogen fixation, the conversion of nitrogen gas into ammonium and then amino acids. They may be intercalary or terminal in position and may germinate from either end or both the ends to give rise to new filaments.
Non-filamentous cyanobacteria generally produce spores…
Chapter 25 Solutions
Prescott's Microbiology
Ch. 25.1 - Prob. 1CCCh. 25.1 - What is the distribution of these microbes?Ch. 25.1 - Prob. 3CCCh. 25.1 - Prob. 4CCCh. 25.1 - Prob. 5CCCh. 25.2 - Prob. 1MICh. 25.4 - Prob. 1CCCh. 25.4 - What is the difference between hyphae called...Ch. 25.4 - How do different mating types of Rhizopus...Ch. 25.4 - Prob. 4CC
Ch. 25.4 - Prob. 5CCCh. 25.5 - What determines when a yeast cell can no longer...Ch. 25.5 - In what ways is the life cycle of filamentous...Ch. 25.5 - Why does nutrient deprivation trigger sexual...Ch. 25.5 - Prob. 2CCCh. 25.5 - Where are you most likely find ascomycetes that...Ch. 25.6 - Prob. 1MICh. 25.7 - Prob. 1CCCh. 25.7 - Prob. 2CCCh. 25.7 - Prob. 3CCCh. 25.7 - Why do you think members of Microsporidia are...Ch. 25 - Prob. 1RCCh. 25 - Prob. 2RCCh. 25 - Prob. 3RCCh. 25 - Prob. 4RCCh. 25 - Prob. 5RCCh. 25 - Prob. 1ALCh. 25 - Prob. 2ALCh. 25 - Prob. 3ALCh. 25 - Analysis of sclerotia and conidia formation in the...Ch. 25 - Prob. 5AL
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Stinkhorn mushrooms embed their spores in a foul-smelling material that is attractive to flies. Explain why this occurs and where else this is observed (what is this referred to in other groups)?arrow_forwardIdentify: 1. A part of the chloroplast in the green algae important in carbon dioxide fixation and for production and concentration of starch. 2. Subgroup of Kingdom Viridiplantae with cytokinesis marked by phragmoplast formation. 3. Subgroup of Kingdom Viridiplantae with centrioles and closed mitosis. 4. Chloroplast morphology of the Chlamydomonas. 5. The characteristic life cycle of Chlamydomonas. 6. Sexual reproduction in Chlamydomonas characterized by the fusion of morphologically similar gametes. 7. Sexual reproduction in Volvox characterized by the fusion of a large, immotile female gametes with small, motile male gametes. 8. The common name of the genus Chara. 9. The specific structure that produce the male gametes in Chara. 10. The specific structure that produce the female gametes in Chara.arrow_forwardThis is a longitudinal section of a Marchantia sp. gametophyte body. Label the following structures: A.) thallus, B.) gemma cup, C.) gemmae.arrow_forward
- Zygomycete bread molds such as Rhizopus stolonifer (black bread mold) produce sporangia in both sexual and asexual reproductive cycles. Which of the following do the sexual sporangia of Rhizopus stolonifer originate from (i.e. what does the sporangia grow out of)? Select one: O a. from the aseptate hyphae O b. from the zygosporangium O c. from the substrate O d. from the gametangiaarrow_forwardDefine germ pore. Differentiate between amyloid, dextrinoid (pseuodamyloid), and inamyloid reactions. Describe the reactions that result in cyanophilous structures and metachromatic structures. Describe the mitic system of mushrooms.arrow_forwardSuperficially, Apiosporina morbosa (causal agent of black knot of cherry) appears morphologically similar to members of the Xylariales as both produce melanized stroma. However, the former is found in the Class Loculoascomycetes while the latter are found in the Class Pyrenomycetes. Why? Discuss the main differences.arrow_forward
- Find the large nucleus located near the cell. Make several outline drawings to illustrate the successive changes of 1. shape of the amoeba. Make drawings of the Amoeba you observe, and label its structures. C O O liko mer 0 AS 6 0 O Paramecium -- Paramecia are quite large, straw-colored, slipper-shaped and move rapidly, and they are thus very noticeable. If there are Paramecia in your field of view you probably will recognize them immediately. Often, however, students do have difficulty both finding a Paramecium, and after they have found one, making it move slowly enough so they can study it at high magnification. The trick to finding a Paramecium is to scan the entire slide quickly using the scanning lens. Then, if you do not find one, make a new slide and search again. Often, Paramecia tend to move to the edges of the coverslip, and even "escape" the coverslip at its edges. The trick to slowing the Paramecia is to mix a drop of methyl cellulose with a drop of the cell culture, as…arrow_forwardThe figure below shows the life cycle of the fungus Neurospora. The adult stage of the Neurospora is a multicellular haploid. a) Between which two stages of the Neurospora life cycle (shown above) do most mitotic cell division oarrow_forwardidentify the following:1. The sexual fruiting body in the genus Coprinus.2. The specific layer of the lichen body or thallus that is photosynthetic in function.3. A club shaped structure that directly produce haploid spores in the Coprinus sp.arrow_forward
- Compare and contrast the production of a planttumor by Agrobacterium tumefaciens and a root noduleby a Rhizobium species. In what ways are thesestructures similar? In what ways are they different?Of what importance are plasmids to the developmentof both structures?arrow_forward4.1 Attine ants cultivate a garden of Leucocoprini fungus for its nourishment, while the fungus receives all its requirements for growth from the ants. The ants also promote the growth of an actinomycete, Pseudonocardia, which produces an antimicrobial compound that inhibits the growth of another fungus, Escovopsis which is a parasite of Leucocoprini. Check all the applicable interactions observed in this multi-species interaction from the choices givenarrow_forwardSince dimorphism is a property of fungi, how do you account for thefact that molds grow preferentially in vitro rather than in vivo?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
1) Cell Culture Tutorial - An Introduction; Author: Applied Biological Materials - abm;https://www.youtube.com/watch?v=RpDke-Sadzo;License: Standard youtube license