Domanda del libro di testo
The most important primary producers in marine ecosystems are ___________.
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Ch. 27 - Diversification of Eukaryotes
Freeman8th EditionBiological ScienceISBN: 9780138276263
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TOC.tableOfContents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Capitolo 27, Problema 1
Why are protists considered paraphyletic?
a. They include many extinct forms, including lineages that no longer have any living representatives.
b. They include some but not all descendants of their most recent common ancestor.
c. They represent all of the descendants of a single common ancestor.
d. Not all protists have all of the synapomorphies that define the Eukarya, such as a nucleus.
Guida verificata passo dopo passo1
Understand the definition of a paraphyletic group: A paraphyletic group consists of an ancestral species and some, but not all, of its descendants.
Identify the characteristics of protists: Protists are a diverse group of eukaryotic organisms that do not fit into the other kingdoms such as plants, animals, or fungi.
Analyze the options given: Consider which option describes a group that includes some but not all descendants of a common ancestor.
Option b states that protists include some but not all descendants of their most recent common ancestor, which aligns with the definition of a paraphyletic group.
Conclude that protists are considered paraphyletic because they do not include all descendants of their most recent common ancestor, as described in option b.
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Paraphyletic Group
A paraphyletic group consists of organisms that include some, but not all, descendants of a common ancestor. This means that while they share a common lineage, the group excludes certain descendants that have diverged from the main lineage, making it incomplete in terms of evolutionary relationships.
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Percorso guidato
06:37
Monophyletic, Paraphyletic, & Polyphyletic Group
Protists
Protists are a diverse group of eukaryotic microorganisms, which are not classified as plants, animals, or fungi. They exhibit a wide range of characteristics and can be unicellular or multicellular. Due to their diversity and evolutionary history, protists do not form a monophyletic group, leading to their classification as paraphyletic.
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03:23What is a Protist?
Synapomorphies
Synapomorphies are shared derived traits that are used to determine evolutionary relationships among organisms. In the context of Eukarya, synapomorphies include features like a nucleus and membrane-bound organelles. Not all protists possess these defining traits, which contributes to their classification as paraphyletic within the broader eukaryotic lineage.
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15:46Cladistics
Pratica correlata
Domanda del libro di testo
Evaluate the following statements regarding motility in protists. Select True or False for each statement.
T/F Amoeboid motion is common in species with cell walls.
T/F Some protists use flagella to swim.
T/F Some protists use cilia to swim, which are shorter and more numerous than flagella.
T/F Amoeboid motion requires ATP and interactions between the proteins actin and myosin.
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Domanda del libro di testo
How can dinoflagellates be harmful to humans? a. They are transmitted by mosquitoes and cause malaria. b. They produce toxins that can be absorbed by clams and other shellfish which, when eaten by people, can lead to paralytic shellfish poisoning. c. They cause amoebic dysentery which leads to severe diarrhea and dehydration. d. They are transmitted by tsetse flies and cause 'sleeping sickness.'
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