Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 27, Problem 14TYK
Summary Introduction
To review:
The reason behind the studies of the molecular sensor, receptor tyrosine kinase, which supports the hypothesis that choanoflagellate—type of protest—are the ancestors of animals.
Introduction:
Protista are simple eukaryotic, single-celled, or multicellular organisms. They are found in the moist area, some are aquatic and some live inside the bodies of animals. There are some
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Movement is a type of response to stimuli. Many unicellular organisms can move in response to chemical changes outside the cell – amoeba exhibits locomotion, paramecium use cilia to get around. Protists such as the Amoeba and the Paramecium are important to our discussion of evolution because of their ability to respond to changes in the environment. These single-celled eukaryotes have this ability because a) their DNA responds to stimuli from the environment, b) they have the same germ cell layers that the Cnidaria have, c) new proteins, located in the cell membrane, have shapes and charge patterns that react to a stimulus by generating an electrical impulse. d) they have a Golgi Apparatus that measures the stimulus from the environment, e) none of these are possible.
Please briefly describe the idea of endosymbiosis and its role in protist evolution-relate to the idea of function of the group.
Part 1A:
After attending the Protista lab (Lab 2) of BIOL2101 course, and seeing all the amazingly different
Protists that can be found in a single drop of natural water sources; Mohammed get excited to see
the different types of protists that might be found in water from rain paddles in his family farm in
Al-Seeb, therefore, he took a sample to a Biology lab at SQU.
Mohammed added a drop of water on a slide and covered it with a coverslip. Then he observed
the slide under the microscope (40x) and took pictures for the following microorganisms:
A
1- How do you think organisms in figure A most probably acquire their nutrients? Explain
your answer. ôi bor ti
2- Examining the details of the organism in figure B, what is the mechanism of movement?
And which Phylum does it belong to?
(nir ti
3- Mohammed took a sample of the water he collected from the farm and mixed it with
distilled water. The next day, he observed the new sample under the microscope and was
surprised to see that many…
Chapter 27 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 27.1 - What distinguishes protists from prokaryotes? What...Ch. 27.2 - What is the evidence that the metamonads, which...Ch. 27.2 - In primary endosymbiosis, a nonphotosynthetic...Ch. 27 - Which of the following is a characteristic of...Ch. 27 - Which of the following is not found among the...Ch. 27 - Prob. 3TYKCh. 27 - When Paramecium conjugate: a. cytoplasmic division...Ch. 27 - The group Diplomonadida is characterized by: a. a...Ch. 27 - Prob. 6TYKCh. 27 - Prob. 7TYK
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- EVOLUTION LINK Why are the protists considered paraphyletic? Use Figure 26-3 to help explain your answer.arrow_forwardI don't understand this practice bio question: Despite the fact that modern taxonomists have abandoned the Kingdom Protista, the term "protist" persists in the biological literature. Explain the current meaning of the term protist and give several specific examples.arrow_forwardGive an example of a protist that is:(a) a parasite of humans(b) very large and photosynthetic(c) a unicellular species with two flagella and photosynthetic(d) covered in ciliaarrow_forward
- When DNA sequence date became widely available, it was revealed that (select all that apply) Plants, animals and fungi are nested within the protist tree of life Plants, animals and fungi are protists Plants are more closely related to animals than to fungi Fungi are more closely related to animals than to plantsarrow_forwardWhich of the following explains why protists are considered a paraphyletic group? A Protists are prokaryotic. B Protists cannot be a monophyletic group because their morphology and behavior are so variable. C Protists lack a common ancestor. O D The MRCA of the protists also gave rise to plants, animals, and fungi. O E Choices B and D are both correct.arrow_forwardTest Your Understanding 1. Which 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 scientist has discovered a new species and is tasked with identifying which of the kingdoms of life the organism might fit. Multicellular with nuclei Presence of a cell wall containing chitin Heterotrophic Non-motile Question options: Fungi Protista Plantae Animalia Protists are a group of organisms that are eukaryotic. However, they are a diverse group, with some of the members of the group having a more recent common ancestor with plants while others have a more recent common ancestor with animals. Algae are protists that are more closely related to plants than any other group. Which characteristics would algae share with plants but NOT with animals? Question options: DNA Ribosomes Chloroplasts Mitochondriaarrow_forwardA) 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_forwardAmoebae extend pseudopodium which is a temporary actin-based protrusion of their body membrane to probe and crawl. Elaborate the directed movement of Amoebae response to extracellular chemical stimulants. Cite a specific chemical stimulant to elucidate your idea.arrow_forward
- The Phylum Animalia has some unique traits that set it apart from plants and fungi. Check all traits that animals have: [] They have teeth [] A blastula is formed shortly after fertilization [] They are all cute and furry [] Prokaryotic Cells [] Eukaryotic cells[] They are all noctumal[] Multicellular[] They are all nocturnal[] Motile at some point in their lives[] No cell wallarrow_forwardSome non-plant organisms like the protist that spreads malaria contain a non-photosynthetic chloroplast called an apicoplast. Crazy! What best explains how protists have evolved apicoplasts?arrow_forwardWhat evidence did Carl Woese use to create his Three Domain Hypothesis? Comparison of organelle reproduction Comparison of 80S and 70S ribosomes Comparison of rRNA Comparison of organelle membrane structurearrow_forward
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