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Ch. 28 - Protists
All textbooksCampbell 11th EditionCh. 28 - ProtistsProblem 5
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Chapter 28, Problem 5

In a life cycle with alternation of generations, multicellular haploid forms alternate with a. unicellular haploid forms. b. unicellular diploid forms. c. multicellular haploid forms. d. multicellular diploid forms.

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Hello everyone. And in today's video, we're going to be going over a very simple problem regarding genetics and so let's jump straight into it. In the life cycle of protest. A multicellular high platform alternates with a multicellular deployed form. This process is referred to as and were given a few processes that we need to determine it from now. The keywords to this problem are the multicellular hap Lloyd form alternates with a multicellular deployed form. So what this is describing is that the employee of the organism is changing depending on the stage that is present in in the life cycle. This process can be visualized as this. At some point in the life cycle, the organism is going to be in its hap Lloyd stage. Then it's going to alternate to its diplo stage and then it's going to go back for full circle to its hapless stage. This process is clearly describing alternation of generation. If we go over or other answer choices, we have conservation of generations and extinction of generations. None of these processes are really described in the question explanation. And so this is our final answer. So, thank you very much for sticking around until the end of this video. I really hope it helped you
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Textbook Question

Biologists think that endosymbiosis gave rise to mitochondria before plastids partly because a. the products of photosynthesis could not be metabolized without mitochondrial enzymes. b. all eukaryotes have mitochondria (or their remnants), whereas many eukaryotes do not have plastids. c. mitochondrial DNA is less similar to prokaryotic DNA than is plastid DNA. d. without mitochondrial CO2 production, photosynthesis could not occur.

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Textbook Question

Which group is incorrectly paired with its description? a. diatoms—important producers in aquatic communities b. red algae—eukaryotes that acquired plastids by secondary endosymbiosis c. apicomplexans—unicellular parasites with intricate life cycles d. diplomonads—unicellular eukaryotes with modified mitochondria

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Textbook Question

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 algae d. both A and C

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Textbook Question

Based on the phylogenetic tree in Figure 28.2, which of the following statements is correct? a. The most recent common ancestor of Excavata is older than that of SAR. b. The most recent common ancestor of SAR is older than that of Unikonta. c. The most basal (first to diverge) eukaryotic supergroup cannot be determined. d. Excavata is the most basal eukaryotic supergroup.

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Textbook Question

EVOLUTION CONNECTION • DRAW IT Medical researchers seek to develop drugs that can kill or restrict the growth of human pathogens yet have few harmful effects on patients. These drugs often work by disrupting the metabolism of the pathogen or by targeting its structural features. Draw and label a phylogenetic tree that includes an ancestral prokaryote and the following groups of organisms: Excavata, SAR, Archaeplastida, Unikonta, and, within Unikonta, amoebozoans, animals, choanoflagellates, fungi, and nucleariids. Based on this tree, hypothesize whether it would be most difficult to develop drugs to combat human pathogens that are prokaryotes, protists, animals, or fungi. (You do not need to consider the evolution of drug resistance by the pathogen.)


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