Concept explainers
FOCUS ON EVOLUTION
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
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Chapter 25 Solutions
CAMPBELL BIOLOGY IN FOCUS-TEXT,AP ED.
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- Which of the following statement(s) or feature(s) apply to Amoeba proteus? Sclect 3 comect answaits Eukaryote Possess a nucleus Unicellular organism Can do photosynthesis Multicellular organism Prokaryote Bacteriaarrow_forwardWhich synapomorphy would most correctly complete this phylogenetic tree? Bacteria Archaea Eukarya Membrane-bound Branched organelles hydrocarbons DNA in histones O Cell membranes O Unicellular O Peptidoglycan cell walls O Nuclear membranesarrow_forwardBacteria that cause the disease typhus arc close relatives of bacteria that evolved into __________. a. protists b. protocells c. chioroplasts d. mitochondriaarrow_forward
- A) 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_forwardAfter the glacial retreat at the end of the last ice age, some three-spine stickleback fish (Gasterosteus aculeatus) were isolated in small lakes. A mutation occurred in these fish that resulted in the loss of pelvic spines. Today, all freshwater sticklebacks lack pelvic spines, but are still classified as members of the same species as marine sticklebacks. Scientists collected sticklebacks from both marine and freshwater environments and placed them together in a controlled environment. Which of the following statements describes the effect of the mutation on their ability to interbreed? They should be able to interbreed and produce fertile offspring. They will not be able to interbreed and produce offspring because of hybrid breakdown. They will not be able to interbreed and produce offspring because of mechanical isolation. They should be able to interbreed and produce offspring, but the offspring may experience reduced hybrid fertility.arrow_forwardDNA sequence data for a diplomonad, a euglenid, a plant, and an unidentified protist suggest that the unidentified species is most closely related to the diplomonad. Further studies reveal that the unknown species has fully functional mitochondria. Based on these data, at what point on the phylogenetic tree in Figure 1 did the mystery protist’s lineage probably diverge from other eukaryote lineages? Explain.arrow_forward
- Which of the following are lines of evidence for endosymbiosis? Inner membranes are similar to plasma membranes of prokaryotes O DNA structure in chloroplasts and mitochondria are similar to that of prokaryotes Mitochondrial ribosomes are more similar to prokaryotic than eukaryotic ribosomes O The DNA found in the nucleus of a eukaryotic cell is very similar to that of prokaryotes.arrow_forwardWhich of the following pieces of evidence could support the endosymbiotic theory if found to be true? Traces of peptidoglycan in the cytoplasm in eukaryotes Presence of rRNA in eukaryotes Presence of 80S ribosomes in eukaryotes The discovery of a unicellular eukaryotearrow_forwardWhich of the following statement(s) or feature(s) apply to Amoeba proteus ? Select 3 correct answer(s) practie Can do photosynthesis Prokaryote Bacteria O Unicellular organism O Multicellular organism Eukaryote Possess a nucleusarrow_forward
- Why are protists not all grouped together into a single eukaryotic supergroup? Their modes of reproduction are extremely diverse. They do not all possess the same mitochondria structure. They did not all evolve from a shared common ancestor. Their DNA sequence is not identical. They fulfill many different ecological roles. They are found in a variety of habitats.arrow_forwardArchaea are so named because option1-their cell structure is thought to be more primitive than the cell structure of bacteria option2-they arose from the joining of members from the Archaea and Bacteria Domains. option3-many survive in extreme conditions thought to be similar to ancient earth option4-they are thought to be the first group of prokaryotes to evolve on eartharrow_forwardGiven the following approximation of our current best understanding of the tree of life, which domains are most closely related? Bacteroides Chlamydia Green sulfur bacteria Spirochetes Deinococcus Bacteria Chloroplast ancestor Cyanobacteria Gram-positive bacteria Bacteria and Archaea Thermotoga Archaea and Eukarya Mitochondrial ancestor a Bacteria and Eukarya Proteobacteria 8 Thermodiscus В Y E. coli E Crenarchaeota Korarchaeota Aquifex All three domains of life are equally closely related Archaea Euryarchaeota Methanospirillum Methanococcus Haloferax Thermococcus Giardia Eukarya Trichomonas Trypanosoma Physarum Encephalitozoon Animals Fungi Plants Paramecium Dictyostelium Entamoebaarrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningBiology: The Unity and Diversity of Life (MindTap...BiologyISBN:9781305073951Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa StarrPublisher:Cengage Learning
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