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MCB4403 Exam 3 questions n answers graded A+
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MCB4403 Exam 3 questions n answers graded A+
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MCB4403: Exam 3 questions n answersgraded A+
Metabolic diversity among organisms - correct answer ✔✔photoautotroph: obtain energy from
light, carbon from CO2
photoheterotroph: obtain energy from life, carbon from organic compounds
chemoautotroph: obtain energy from chemical exchange, carbon from CO2
chemoheterotroph: obtain energy from chemical exchange, carbon from organic compounds
Molecular clocks - correct answer ✔✔the temporal information contained in a macromolecular
sequence
- based on the acquisition of new random mutations in each round of DNA replication
- looks at rRNA and proteins, tRNA, and RNA polymerase
- most common used molecular clock is the small subunit rRNA (16S in bacteria or 18S in
eukaryotes)
Scientific names - correct answer ✔✔- linnaeus established the system of scientific
nomenclature
- each organism has 2 names: genus and species
, - italicized, genus is capitalized and species is lower case
- are latinized and used worldwide
- may be descriptive or honor a scientist
Naming a species - correct answer ✔✔- rules have been determined by the International
Committee on Systematics of Prokaryotes (ICSP)
- to establish a new species of an unknown microbe, it must be grown as a pure culture (isolate)
- proposed name is "Candidatus" for candidate species
Identification - correct answer ✔✔- practical identification is based on a combination of
phylogenetic and phenetic traits
- a common strategy of practical identification is the dichotomous key (a series of yes/no
decisions successively narrowing down the possible categories of species); most traits are
phenotypic
- identifies some organisms down to the genus level and others only to numbered samples
Carl Woese - correct answer ✔✔- first used SSU rRNA phylogeny to reveal the existence of a
third kind of life: Archaea
- gave rise to the 3 domains of life
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