10. According to the endosymbiosis theory mitochondria evolved from ancient (A)
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10. According to the endosymbiosis theory mitochondria evolved from ancient (A) fungi () cyanobacteria (C) proteobacteria archaea (E) respiring protists 11. Which of the following were critical for Carl Woese to develop the three-domain scheme of classification? (A) germ theory of disease () sequences of 16S rRNA (C) advances in light microscopy (D) petri dishes for pure cultures (E) ultracentrifugation techniques 12. The genetic expression machinery of archaea is most similar to that of? (A) monera (B) prokaryotes (C) eukaryotes (D) bacteria (E) mitochondria 13. A bacteriophage is (A) a method bacteria use for feeding (C) (B) a type of archaea a virus that infects eukaryotic cells (E) (D) a bacterium that consume viruses a virus that infects bacteria 14. Which of the following would allow a disease- causing microbe not to adhere to Koch's postulates? (A) The microbe is found in all patients with a particular disease but also in some patients without the disease (B) The microbe can infect multiple different species, for example both humans and rabbits (C) The microbe can be grown in pure culture (D) The microbe is a eukaryotic pathogen (E) The microbe can be killed by antisepticsExplanation / Answer
10- C
According to Endosymbiont theory, Mitochondria evolved from a bacterial proginator via symbiosis within an Eukaryotic host cell. The mitochondrion is believed to be originated from a bacterial phylum, ALPHA-PROTEOBACTERIA. The fact that mitochondrion is semiautonomous in nature with its own ATP production supports this hypothesis.
11- B
Carl Woese in 1977 proposed Three-Domain classification, which divided living organisms into three broad Domains i.e Archea, Bacteria and Eukaryote. This classsification was purely on the basis of differences in 16s rRNA genes. After sequencing 16s rRNA genes, he found that two groups of bacteria and eukaryota arose separately from a common ancestor.
12- C
Archea have many genes and several metabolic patheways that are similiar to eukaryotes. Moreover Archea and eukaryotes have closed related enzymes that take part in transcription and translation. Energy is stored in form of ATP through chemiosmosis which is similiar to eukaryotes.
14- D
Bacteriophage is a virus that infects bacteria. Bacteriophage means 'bacteria eater'.
15- D
All are postulates of koch's hypothesis except D
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