Homework answers / question archive / McMaster University BIO 2EE3 CHAPTER 17 1)Which of these is true of a mutualistic relationship? Both organisms benefit Both members are harmed from the relationship One member benefits and the other member is harmed Neither organism benefits or is harmed by the relationship One member benefits and the other member does not receive any benefit   Once rhizobia enter the plant cell through the infection thread they undergo rapid multiplication and differentiation into pleomorphic nitrogen fixing cells called                      Reticulate forms Bacteroids Elementary bodies Shizonts Nitromorphs   The host-range specificity between specific legumes with specific rhizobia involves the transcriptional activation of the bacterial nod genes through the secretion of specific                             by the plant Flavonoids Nucleotides Fatty acids Lactones Sugars   The mycobiont of a lichen receives sugars from the photobiont as a benefit from this relationship while the photobiont receives                                                                          from the mycobiont as a benefit Vitamins and amino acids ATP Protection from predation Amino acids Inorganic nutrients and protection from desiccation   What is the human microbiome composed of All microbes that live in or within the human body All the microbes that cause disease in humans Microbes that contribute to the health of humans Microbes that live on human skin Microbes that live in the intestinal tract of humans   Which of these is the MOST abundant bacterial group in the colon? Lactobacilli Members of the phylum Proteobacteria The family Enterobacteriaceae Obligate anaerobes Facultative anaerobes   Many of the rumen bacteria specialize in the breakdown of these macromolecules Cellulose polymers Peptidoglycans Nucleic acids Fatty acids Proteins   What is an endophyte? A parasite of a plant A symbiont that lives inside plant cells A parasite of an animal A member of the intestinal tract microbial community A member of the root rhizosphere   The red color of plant root nodules is due to this oxygen binding protein Cytochrome c Flavoprotein Nitrate reductase Menaquinone Leghemoglobin   In order to make sufficient ATP for symbiotic nitrogen fixation, the plant supplies the symbionts with   for energy production Fatty acids Glucose C3 acids NADH C4-diacarboxylic acids   Which of these is TRUE of a lichen? It is comprised of a fungus and usually a green alga It is comprised of a fungus and an archaeal symbiont It is a type of slime mold It is comprised of a protozoan and anarchaeal symbiont It is classified as a plant   The vagina of women of child-bearing age has an acidic pH

McMaster University BIO 2EE3 CHAPTER 17 1)Which of these is true of a mutualistic relationship? Both organisms benefit Both members are harmed from the relationship One member benefits and the other member is harmed Neither organism benefits or is harmed by the relationship One member benefits and the other member does not receive any benefit   Once rhizobia enter the plant cell through the infection thread they undergo rapid multiplication and differentiation into pleomorphic nitrogen fixing cells called                      Reticulate forms Bacteroids Elementary bodies Shizonts Nitromorphs   The host-range specificity between specific legumes with specific rhizobia involves the transcriptional activation of the bacterial nod genes through the secretion of specific                             by the plant Flavonoids Nucleotides Fatty acids Lactones Sugars   The mycobiont of a lichen receives sugars from the photobiont as a benefit from this relationship while the photobiont receives                                                                          from the mycobiont as a benefit Vitamins and amino acids ATP Protection from predation Amino acids Inorganic nutrients and protection from desiccation   What is the human microbiome composed of All microbes that live in or within the human body All the microbes that cause disease in humans Microbes that contribute to the health of humans Microbes that live on human skin Microbes that live in the intestinal tract of humans   Which of these is the MOST abundant bacterial group in the colon? Lactobacilli Members of the phylum Proteobacteria The family Enterobacteriaceae Obligate anaerobes Facultative anaerobes   Many of the rumen bacteria specialize in the breakdown of these macromolecules Cellulose polymers Peptidoglycans Nucleic acids Fatty acids Proteins   What is an endophyte? A parasite of a plant A symbiont that lives inside plant cells A parasite of an animal A member of the intestinal tract microbial community A member of the root rhizosphere   The red color of plant root nodules is due to this oxygen binding protein Cytochrome c Flavoprotein Nitrate reductase Menaquinone Leghemoglobin   In order to make sufficient ATP for symbiotic nitrogen fixation, the plant supplies the symbionts with   for energy production Fatty acids Glucose C3 acids NADH C4-diacarboxylic acids   Which of these is TRUE of a lichen? It is comprised of a fungus and usually a green alga It is comprised of a fungus and an archaeal symbiont It is a type of slime mold It is comprised of a protozoan and anarchaeal symbiont It is classified as a plant   The vagina of women of child-bearing age has an acidic pH

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13. The majority of Archaea found in the human intestinal tract are            
    1. Methanogens
    2. Halobacteria
    3. Sulfide oxidizing bacteria
    4. Fermenters
    5. Sulfate-reducing bacteria

 

14. Herbivores require microorganisms to help them with the digestion of this compound
    1. Nucleic acids
    2. Starch
    3. Glycogen
    4. Proteins
    5. Cellulose

 

15. Which of these is characteristic of the nitrogenase enzyme?
    1. It requires hydrogen gas for activity
    2. It is irreversibly inactivated by oxygen
    3. It converts dinitrogen to nitrate
    4. It is found in all plant symbionts
    5. It is found in both prokaryotes and eukaryotes

 

16. The most common inhabitants of the human skin are members of which phyla?
    1. Firmicutes and Actinobacteria
    2. Proteobacteria and Firmicutes
    3. Proteobacteria and Bacteroidetes
    4. Bacteroidetes and Firmicutes
    5. Actinobacteria and Proteobacteria