Why Do Symbionts Often Contain Lower G+C Content When Compared

question 32

Multiple Choice

Why do symbionts often contain lower G+C content when compared to free- living organisms?

• A) 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.
• B) 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.
• C) Free- living organisms must have a more stable genome to survive; low G+C content organisms are often selected against in nature.
• D) Ancestral symbionts had low GC content genomes by chance, and these low GC content genomes are passed onto their progeny.

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