Which of the following statements best describes secondary endosymbiosis?
A. A host cell ingests two or more symbionts simultaneously.
B. A host cell without plastids ingests a prokaryotic cell.
C. A host cell manufactures its own symbiont and later acquires another one by phagocytosis.
D. A host cell ingests another cell already containing a primary symbiont.
E. A host cell ingests one symbiont and then later ingests another one.
Answer: D
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You decide to carry out genetic association studies and identify a SNP variant that is found significantly more often in individuals who have schizophrenia than in those who are not affected. This SNP is found within an intron of the SZP gene
A. Can you deduce that an abnormality of the SZP gene is a cause of increased risk of schizophrenia? B. Can you say whether the SNP variant itself is a cause?