Biology - Study Guide
8th Edition
ISBN: 9780321501561
Author: Martha R. Taylor
Publisher: PEARSON EDUCATION (COLLEGE)
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Chapter 28, Problem 4TYK
Summary Introduction
Introduction: Diplomonads, parabasalids, and trypanosomes are a part of the family excavates. Excavates can be defined as a group of unicellular organisms belonging to Protista kingdom.
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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 ponds
Why don't we consider protists to all be in 1 kingdom together anymore?
Group of answer choices
A. because some of them are prokaryotic
B. because they are not all closely related
C. because they are all prokaryotic
D. because some of them are multicellular
Why is the classification of protists based on DNA sequences useful? *
a. Because only protists have DNA
b. Because it has confirmed the traditional categories for protists
c. Because it has revealed evolutionary relationships, even among organisms that look diffferent
d. All of the above are correct
This is a required question
(2) Why is a species with small population more likely than one with a large population to undergo an extinction? *
a. Because small population are exposed to greater environmental changes
b. Because genetic diversity is likely to be lower in a small population
c. Because the mutation rate is too low
d. Because they take too long to produce an offspring.
Chapter 28 Solutions
Biology - Study Guide
Ch. 28 - The plastids of chlorarachniophytes are surrounded...Ch. 28 - Sleeping sickness is caused by the kinetoplastid...Ch. 28 - Sleeping sickness is caused by the kinetoplastid...Ch. 28 - Prob. 4IQCh. 28 - Prob. 5IQCh. 28 - Prob. 6IQCh. 28 - Fill in the names of the two major clades and the...Ch. 28 - Prob. 8IQCh. 28 - Evidence indicates that all plastids (except for...Ch. 28 - Prob. 1TYKM
Ch. 28 - Prob. 2TYKMCh. 28 - Prob. 3TYKMCh. 28 - Prob. 4TYKMCh. 28 - Prob. 5TYKMCh. 28 - Prob. 6TYKMCh. 28 - Prob. 7TYKMCh. 28 - ________ flagella with spiral or crystalline rod;...Ch. 28 - Mixotrophs a. have unicellular and multicellular...Ch. 28 - According to the theory of secondary...Ch. 28 - Prob. 3TYKCh. 28 - Prob. 4TYKCh. 28 - Prob. 5TYKCh. 28 - Genetic variation is generated in the ciliate...Ch. 28 - Prob. 7TYKCh. 28 - Prob. 8TYKCh. 28 - Prob. 9TYKCh. 28 - Prob. 10TYKCh. 28 - Which supergroup includes the land plants? a....Ch. 28 - Prob. 12TYKCh. 28 - Prob. 13TYKCh. 28 - Prob. 14TYK
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- Which of these protists is hypothesized to be ancestral to animals? a. a green algal protist b. a choanoflagellate c. an amoeboid protistd. a slime moldarrow_forwardProtists with the capabilities to absorb nutrients from dead organisms are called ______. a. photoautotrophs b. autotrophs c. saprobes d. heterotrophsarrow_forwardWhy is the classification of protists based on DNA sequences considered useful? a. Because only protists have DNA b. Because genetic sequences have confirmed the traditional categories of protists c. Because DNA reveals evolutionary relationships, even among organisms that look different d. All of the above are correct.arrow_forward
- Plastids that are surrounded by more than twomembranes are evidence of(A) evolution from mitochondria.(B) fusion of plastids.(C) origin of the plastids from archaea.(D) secondary endosymbiosis.arrow_forwardWhich of the following does not explain why slime molds and multicellular algae are included in the Kingdom Protoctista? They A. lack important characteristics of the plants and fungi. B. use an amoeboid type of movement. C. classification system is trying to reflect phylogenetic relationships. D. appear to be more closely related to unicellular eukaryotes.arrow_forwardIf you were to create an evolutionary tree in which amoebas were included within the kingdom of organisms to which they were the most closely related (rather than with protists, where they are currently placed), where would you put them?arrow_forward
- Protists with the capabilities to perform photosynthesis and to absorb nutrients from dead organisms are called ______________. a. photoautotrophs b. mixotrophs c. saprobes d. heterotrophsarrow_forwardHaving linear chromosomes packaged with histone proteins is characteristic of: A. all archaeobacteria B. all gram-positive eubacteria (monoderms) C. all crenarchaeota D. all gram-negative eubacteria (diderms) E. all eukaryotesarrow_forwardThe term protista refers to : a) A kingdom within the superkingom SAR. b) A kingdom within the superkingdom Excavata. c) It is a descriptive term or common name for unicellular, colonial, and some multicellular organisms that lack true tissues. d) A phylum within the Kingdom Metazoa. Which term best describes the following organism: a unicellular (single celled) eukaryote that has a single large mitochondrion, and causes Chagas disease or sleeping sickness. a) Hypermastigophora. b) Diplomonada. c) Algae. d) Trypanosoma. e) Rhizopoda. 4. What term best describes the following organism: a multicellular eukaryote with a chitinous cell wall that is an absorptive heterotroph? a) Fungi. b) Metazoa. c) Plantae. d) Excavata.arrow_forward
- 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 formsarrow_forwardAccording to the phylogeny presented in this chapter, whichprotists are in the same eukaryotic supergroup as plants?(A) green algae(B) dinoflagellates(C) red algae(D) both A and Carrow_forwardSome molecular evidence suggests that the sister group of animals is not the choanoflagellates, but rather a group of parasitic protists, Mesomycetozoa. Given that these parasites lack collar cells, can this hypothesis be correct? Explain.arrow_forward
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