Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 23, Problem 28CTQ
The chllorophyte (green algae) genera Ulva and Caulerpa both have macroscopic leaf-like and stem like structures, but only Ulva species are considered truly multicellular. Explain why.
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Chapter 23 Solutions
Biology 2e
Ch. 23 - Figure 23.5 What evidence is there that...Ch. 23 - Figure 23.25 Which of the following statements...Ch. 23 - Figure 23.28 Which of the following statements...Ch. 23 - What event is thought to have contributed to the...Ch. 23 - Which characteristic is shared by prokaryotes and...Ch. 23 - Mitochondria most likely evolved by ___________ ....Ch. 23 - Which of these protists is believed to have...Ch. 23 - In 2016, scientists published the genome of...Ch. 23 - Which of the following observations about a...Ch. 23 - Protists that have a pellicle are surrounded by...
Ch. 23 - Piotists with the capabilities to perform...Ch. 23 - Which of these locomotor organs would likely be...Ch. 23 - Alternation of generations describes which of the...Ch. 23 - The amoeba E. histolytica is a pathogen that forms...Ch. 23 - Which protist group exhibits mitochondrial...Ch. 23 - Conjugation between two Paramecia produces total...Ch. 23 - What is the function of the raphe in diatoms?...Ch. 23 - What genus of piotists appears to contradict the...Ch. 23 - A marine biologist analyzing water samples notices...Ch. 23 - An example of carbon fixation is photosynthesis...Ch. 23 - Which parasitic protist evades the host immune...Ch. 23 - Which of the following is not a way that piotists...Ch. 23 - Describe the hypothesized steps in the origin of...Ch. 23 - Some aspects of eukaryotes are more similar to...Ch. 23 - Explain in your own words why sexual reproduction...Ch. 23 - Giaidia iamblia is a cyst-forming protist parasite...Ch. 23 - Explain how the definition of protists ensures...Ch. 23 - The chllorophyte (green algae) genera Ulva and...Ch. 23 - Why might a light-sensing eyespot be ineffective...Ch. 23 - Opisthokonta includes animals and fungi, as well...Ch. 23 - Describe two ways in which paramecium differs from...Ch. 23 - How does killing Anopheles mosquitoes affect the...Ch. 23 - Without treatment, why dees African sleeping...Ch. 23 - Describe how increasing stress to the ocean would...
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- Evolution of Photosynthetic Organisms Algae are autotrophs and can have photosynthesis, however, evolutionary evidence suggests that plants shared a common ancestor with only green algae and are closest relatives of Charophytes. What evidences support this statement? How an algal cell is different from fungal cells, even if both are eukaryotes? Why slime mold is a protist not a fungus even if it does not have chloroplast? Renlyarrow_forwardBoth fungi and animals are heterotrophs although they are markedly different in how they acquire nutrients. Explain.arrow_forwardSome fungi can be viewed as coenocytic organisms that exhibit little differentiation. When differentiation does occur, such as in the formation of reproductive structures, it is preceded by septum formation. Why does this occur?arrow_forward
- Many people consider algae to be plants even though algae do not have roots, stems, and leaves, but in many algae, cell division is different from that in true plants. Do most algae have a phragmoplast? What is the name of the structure they use?arrow_forwardZygomycete 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_forwardWhat is the difference between hyphae called rhizoids and those called stolons?arrow_forward
- Do you think multicellular fungi use diffusion, or use bulk flow, to transport O2 and CO2? Why do you think so?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_forwardLichens are said to be composite organisms made up of two very different types of organisms: usually a fungus and an alga (or in a few lichens, a fungus and a Cyanobacterium). (Alga is the singular of algae.) How do these two types of organisms work together to become a functional composite organism? That is, what does each organism provides to the relationship to make it successful? Think about a lichen living on the face of a rock.arrow_forward
- Fungi have an extremely high surface-area-to-volume ratio. What is the advantage of this to an organism that gets most of its nutrition through absorption? O This high ratio means that fungi have a thick, fleshy structure that allows the fungi to store more of the food it absorbs. O The larger surface area allows for more material to be transported through the cell membrane. O This high ratio creates more room inside the cells for additional organelles involved in absorption. O The lower volume prevents the cells from drying out too quickly, which can interfere with absorption. MacBook Pro G Search or typ e URL %23 %2$ % & 3 4 5 8 E R Y F G H. K トarrow_forwardIn 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_forwardFungi and Animals are distantly related to each other. One trait animals and fungi share however is; Both groups are immobile Both groups undergo an alternation of generations Both have heterokaryotic cells Both groups are heterotrophsarrow_forward
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