Amanda0628

A) Ancestral symbionts had low GC content genomes by chance, and these low GC content genomes are passed onto their progeny. B) Replicating high G+C content genomes requires several additional enzymes, to break apart the strong triple bonds formed from GC pairs, which are rarely found in symbionts with relatively small genome sizes. C) Free-living organisms must have a more stable genome to survive; low G+C content organisms are often selected against in nature. D) Symbionts usually do not have as many DNA repair mechanisms as free-living organisms, and two common spontaneous mutations change GC pairs into AT pairs.

Question options: A) Hydrogen sulfide B) Lipid bilayers C) Proteins D) RNA lipid bilayers

A) hydrogen B) nitrate C) ferrous iron D) elemental sulfur

The isolates have 16S rRNA sequences that are 97% similar and share important phenotypic traits. Their genomes have 55% of their genes in common. The isolates would most likely be _____ Question options: A) classified as individual species of the same genus. B) classified as the same species if they can mate via conjugation. C) classified as belonging to the same species. D) split into different families.

A. contain codons that bind to ribosomes during translation. B. function to transfer ribonucleotides to RNA polymerase during transcription C. Once charged with the correct amino acids, they transfer them to the ribosome during translation D. are only present in the nucleus or eukaryotes

Regulatory protein(s) present in Archaea is/are ? A) Activators that stimulate RNA polymerase activity are present in Archaea. B) Both activators and repressors are present in Archaea. C) Similar to regulation in Eukarya, Archaea lack bacterial-like regulators such as activators and repressors and use transcription factors instead. D) Repressors that block RNA polymerase activity are present in Archaea. I had thought it was what is in red, but got it wrong. Can someone point me in the right direction?