Prescott's Microbiology
10th Edition
ISBN: 9781259281594
Author: Joanne Willey, Linda Sherwood Adjunt Professor Lecturer, Christopher J. Woolverton Professor
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 25, Problem 4CHI
Some protists reproduce asexually when nutrients are plentiful and conditions are favorable for growth but reproduce sexually when environmental or nutrient conditions are not favorable. Why is this an evolutionarily important and successful strategy?
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After plasmogamy has occurred, many molds (Mucoromycetes) exist in a heterokaryotic stage for up to centuries at a time. What occurs at the immediate end of this stage?
The nuclei fuse in a process called karyogamy.
The hyphae fuse in a process called karyogamy.
Diploid spores are produced in various spore-producing structures.
A haploid zygote is formed that becomes multicellular through repeated rounds of mitosis.
Is protist dna in a nucleus unicellular or multicellular?According to the phylogeny presented in this chapter which protists are in the same eukaryotic supergroup as plants a) green algae b) dinoflagellates c) red algaed both a and c in a lifecycle with alternation of generations multicellular haploid forms alternate with a unicellular haploid forms b unicellular diploid formsc multicellular haploid forms d) multicellular diploid forms
A protist that was well adapted to its current environment and was not resource
limited would most likely reproduce via asexual reproduction.
false
true
Chapter 25 Solutions
Prescott's Microbiology
Ch. 25.1 - Prob. 1RIACh. 25.1 - Prob. 2RIACh. 25.1 - Prob. 3RIACh. 25.1 - Prob. 4RIACh. 25.1 - Prob. 5RIACh. 25.1 - Describe vesicular, ovular, and chromosomal...Ch. 25.1 - Why has taxonomic classification of protists been...Ch. 25.2 - Prob. 1MICh. 25.2 - What are the functions of the stigma and the...Ch. 25.2 - Prob. 1RIA
Ch. 25.2 - What is the function of the plasmalemma and...Ch. 25.2 - Prob. 3RIACh. 25.3 - Prob. 1MICh. 25.3 - Prob. 2MICh. 25.3 - Prob. 1RIACh. 25.3 - Prob. 2RIACh. 25.3 - What is a plasmodium? How does it differ from the...Ch. 25.3 - Prob. 4RIACh. 25.4 - Prob. 1MICh. 25.4 - What are the functions of the micronucleus and...Ch. 25.4 - How does the trigger for sexual reproduction...Ch. 25.4 - Prob. 1RIACh. 25.4 - Compare how radiolaria use axopodia with the way...Ch. 25.4 - Prob. 3RIACh. 25.4 - Prob. 4RIACh. 25.4 - Describe conjugation as it occurs in ciliates....Ch. 25.4 - Prob. 6RIACh. 25.4 - Prob. 7RIACh. 25.5 - Which of the cells shown above are haploid and...Ch. 25.5 - Prob. 1RIACh. 25.5 - Prob. 2RIACh. 25.5 - Prob. 3RIACh. 25.5 - What does the discovery of a large group of...Ch. 25.5 - Compare the morphology of members of the genus...Ch. 25 - Protist encystment is usually triggered by changes...Ch. 25 - Prob. 2CHICh. 25 - Vaccine development for diseases caused by...Ch. 25 - Some protists reproduce asexually when nutrients...Ch. 25 - Prob. 5CHICh. 25 - Benthic foraminifera inhabit marine sediments. It...
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- Why are protists not all grouped together into a single eukaryotic supergroup? Their modes of reproduction are extremely diverse. They do not all possess the same mitochondria structure. They did not all evolve from a shared common ancestor. Their DNA sequence is not identical. They fulfill many different ecological roles. They are found in a variety of habitats.arrow_forwardAn autotrophic protist, such as a diatom or a dinoflagellate, can evolve into a heterotrophic protist (and therefore a protozoan) simply by losing its chloroplasts. Under what conditions might this take place?arrow_forwardWhich of the following processes are involved in thereproduction of protists ?(a) Binary fission and budding(b) Cell fusion and zygote formation(c) Spore formation and cyst formation(d) All of the above Please try to break the solutions into as many steps as practically possible and the steps should come one by one and they should be short and crisp and plagiarism-free.arrow_forward
- 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…arrow_forwardList four mechanisms of protist nutrition.arrow_forwardAn infectious disease research group is studying a microbe that can cause infections and gastrointestinal disease in humans, and which can also survive and reproduce in hamsters. A dormant cyst form of the microbe infects human hosts through fecal-oral transmission if they come in contact with hamster droppings and don’t wash their hands before eating. The organism exhibits active, motile morphological forms at other stages of its life cycle. Sexual reproduction (fusion of haploid gametes) occurs in the hamsters; only asexual reproduction occurs in humans. It has a nucleus, but does NOT have a cell wall. This microbe could be which of the following? Protozoan Fungus Bacterium Virusarrow_forward
- Using either bacteria or protists as an example, how can bacteria or protists reproduce sexually (i.e., exchange genetic material)? Be specific about which organism you choose to describe (bacteria or protist).arrow_forwardHow do protists carry out sexual reproduction? Discuss by giving an example.arrow_forwardWhich of the following is not true of the protists? (a) they are unicellular, colonial, coenocytic, or simple multicellular organisms (b) their cilia and flagella have a 9 + 2 arrangement of microtubules (c) they are prokaryotic, as bacteria and archaea are (d) some are free-living, and some are endosymbionts (e) most are aquatic and live in the ocean or in freshwater pondsarrow_forward
- A) A major difference between eukaryotic cells and prokaryotic cells is that eukaryotic cells Group of answer choices exhibit little if any compartmentalization of function are generally smaller than prokaryotic cells have a large degree of internal organization lack organelles have little if any internal organization B) Which of the following statements about protists is false? Group of answer choices Some protists are mixotrophic Certain protists share a common ancestor with land plants Some protists are photosynthetic prokaryotes which are similar to the ancestral chloroplast Protists are a polyphyletic group of organisms that often bear little resemblance to each other Although most protists are unicellular, some protists are multicellular as wellarrow_forwardIn a population of bread molds (zygomycetes), one individual inherits a mutation that prohibits it from engaging in plasmogamy with other individuals. This fungus will not be able to do which of the following two things; *** 'Bubble both that apply*** Note that both are required for credit. The fungus will not be able to reproduce sexually The fungus will not be able to create spores of any kind The fungus will not be able to digest any food The fungus will not fuse it's cytoplasm with another individualarrow_forwardWhich of the following are lines of evidence for endosymbiosis? Inner membranes are similar to plasma membranes of prokaryotes O DNA structure in chloroplasts and mitochondria are similar to that of prokaryotes Mitochondrial ribosomes are more similar to prokaryotic than eukaryotic ribosomes O The DNA found in the nucleus of a eukaryotic cell is very similar to that of prokaryotes.arrow_forward
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Parasites: Protozoa (classification, structure, life cycle); Author: ATP;https://www.youtube.com/watch?v=V4iSB0_7opM;License: Standard youtube license