FINAL SCORE / 86 pts (Graduate students: 92 pts) EXAM 1: Intro / History / Micro
ID: 209199 • Letter: F
Question
FINAL SCORE / 86 pts (Graduate students: 92 pts) EXAM 1: Intro / History / Microscopy/Cell Envelopes Multiple Choice (30 questions, 1 point each) Clearly mark the correct answer for ead )Analysis of DNA sequences reveals a. the ancient convergence of two cell types (i.e., prokaryotes and eukaryotes). b. that prokaryotes and eukaryotes evolved from a common ancestral cell. @that bacteria share a common ancestor with archaea but not with eukarya d. that prokaryotes are cells with a nucleus. e. that the genome of Haemophilus influenzae has about 2 billion base pairs. are considered to be microbes but NOT considered to hacteria e. archaea fungi billion years p 3.8 2Explanation / Answer
DNA sequence analysis indicates that the machinery for DNA replication and transcription in archaeans resembles that of eukaryans, whereas their metabolism strongly resembles that of bacteria. About half of the genes found in the kingdom archaea are unique to this group. Hence answer C is wrong.
Answer A is wrong - most comparative genomic approaches investigate sequences that are related by divergent evolution from a common ancestor.
Answer D is wrong - Prokaryotic cells do not contain nuclei
Answer E is wrong - bacterium Haemophilus influenzae. Its genome comprises 1,830,137 base pairs
Answer B is correct - That Prokaryotes and Eukaryotes evolved from a common ancestral cell.
Eukaryotes are thought to have evolved from prokaryotes. Reasons are DNA analysis reveals that eukaryotes contain many bacterial genes. Mitochondria and chloroplasts are similar to bacteria in size and divide independently of the eukaryote host cell by a process called binary fission. Bacteria also replicate by binary fission, while eukaryotes multiply by mitosis or meiosis. Mitochondria and chloroplasts inside the eukaryotic cell have single, circular DNA molecules just like bacteria.
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