Prescott's Microbiology
11th Edition
ISBN: 9781260409062
Author: WILLEY, Joanne
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 24.3, Problem 2MI
Summary Introduction
Dictyostelium discoideum belongs to the phylum Amoebozoa. It is generally referred to as cellular slime molds. Dictyostelium discoideum use endocytosis to feed on yeasts and bacteria. The life cycle of Dictyostelium discoideum is complex and it comprises true multicellularity, in spite of their primitive evolutionary position.
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The figure below shows the life cycle of the fungus Neurospora. The adult stage of the Neurospora is a multicellular haploid.
b) Neurospora has an arginine amino acid synthesis pathway shown below. Suppose I take the strain above that only grows with arginine supplements and cross it to a different mutant Neurospora strain that grows with arginine and citrulline supplements but not with ornithine supplements. Assuming gens A, B, and C are unlinked and there is only one mutation per stain:
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A cross was performed between a yeast strain that requires methionine and lysine for growth (met− lys−)and another yeast strain, which is met+ lys+. One hundred asci were dissected, and colonies were grownfrom the four spores in each ascus. Cells from thesecolonies were tested for their ability to grow on petriplates containing either minimal medium (min), min+ lysine (lys), min + methionine (met), or min + lys+ met. The asci could be divided into two groupsbased on this analysis:Group 1: In 89 asci, cells from two of the four spore colonies couldgrow on all four kinds of media, while the other two spore coloniescould grow only on min + lys + met.Group 2: In 11 asci, cells from one of the four spore colonies couldgrow on all four kinds of petri plates. Cells from a second one ofthe four spore colonies could grow only on min + lys plates andon min + lys + met plates. Cells from a third of the four sporecolonies could only grow on min + met plates and on min + lys+ met. Cells from the…
Chapter 24 Solutions
Prescott's Microbiology
Ch. 24.1 - Prob. 1CCCh. 24.1 - Prob. 2CCCh. 24.1 - Prob. 3CCCh. 24.1 - Prob. 4CCCh. 24.1 - Prob. 5CCCh. 24.1 - Describe vesicular, ovular, and chromosomal...Ch. 24.1 - Why has taxonomic classification of protists been...Ch. 24.2 - Prob. 1MICh. 24.2 - What are the functions of the stigma and the...Ch. 24.2 - Prob. 1CC
Ch. 24.2 - What is the function of the plasmalemma and...Ch. 24.2 - Prob. 3CCCh. 24.3 - Prob. 1MICh. 24.3 - Prob. 2MICh. 24.3 - Prob. 1CCCh. 24.3 - Prob. 2CCCh. 24.3 - Prob. 3CCCh. 24.4 - Prob. 1MICh. 24.4 - What are the functions of the micronucleus and...Ch. 24.4 - How does the trigger for sexual reproduction...Ch. 24.4 - Prob. 1CCCh. 24.4 - Compare how radiolaria use axopodia with the way...Ch. 24.4 - Prob. 3CCCh. 24.4 - Prob. 4CCCh. 24.4 - Describe conjugation as it occurs in ciliates....Ch. 24.4 - Prob. 6CCCh. 24.4 - Prob. 7CCCh. 24.4 - Prob. 8CCCh. 24.4 - Prob. 9CCCh. 24.5 - Prob. 1MICh. 24.5 - Compare the morphology of members of the genus...Ch. 24.5 - Prob. 2CCCh. 24 - Prob. 1RCCh. 24 - Prob. 2RCCh. 24 - Prob. 3RCCh. 24 - Prob. 4RCCh. 24 - Prob. 5RCCh. 24 - Prob. 6RCCh. 24 - Protist encystment is usually triggered by changes...Ch. 24 - Vaccine development for diseases caused by...Ch. 24 - Prob. 3ALCh. 24 - Benthic foraminifera inhabit marine sediments. It...Ch. 24 - Prob. 5AL
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