Symbionts such as Aeromonas veronii of leeches and Buchnera symbionts of insects are transmitted ________ to ensure the safe transfer of the symbiont to the next host generation
A) vertically to offspring
B) horizontally through infected water
C) horizontally through infected secondary hosts
D) vertically through the air
Answer: A
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Which of the following statements is true?
a. In carriers, the recessive allele causes an intermediate phenotype. b. With recessive genetic disorders, if both parents are carriers, the offspring will all be affected. c. In recessive genetic disorders, the mother and/or father of an affected individual must also be affected. d. With dominant genetic disorders, the mother and/or father of an affected individual must also be affected. e. The dominant allele is masked in homozygous dominant individuals.
A one-way relationship in which one species
benefits at the expense of another is a. commensalism. b. competitive exclusion. c. parasitism. d. obligate mutualism. e. a neutral relationship
The metabolism of a cell is the sum of all of its chemical reactions
Indicate whether the statement is true or false
Why is ribosomal RNA so useful for cataloging species in microbiome research?
A. The genes for rRNA are universal and slow to evolve. B. The genes for rRNA are more stable than other DNA, even in seawater. C. Genes for rRNA are unique to microbes, and not found in higher organisms. D. The few species that have rRNA genes are easily characterized by their presence.