Organisms have been discovered that were trapped in amber for thousands of years, but were able to grow when placed on nutrient media. This is explained by
the organisms formed endospores.
amber is a great source of nutrients.
the organisms were prions.
some organisms have a generation time that lasts thousands of years.
The Correct Answer is A
A. The organisms formed endospores: Some bacteria can form endospores, which are highly resistant structures that allow survival in extreme conditions for long periods. This explains how they remained dormant in amber yet grew once favorable conditions were restored.
B. Amber is a great source of nutrients: Amber is fossilized tree resin and does not contain nutrients sufficient to sustain microbial life. It primarily serves as a protective medium, not a nutritional one.
C. The organisms were prions: Prions are infectious proteins that do not have the cellular machinery to grow on nutrient media. They cannot be revived in the same way bacteria can.
D. Some organisms have a generation time that lasts thousands of years: Generation times vary among species but never extend to thousands of years. Instead, organisms survive long periods through dormancy mechanisms like endospore formation.
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Related Questions
Correct Answer is B
Explanation
A. budding: During budding, new viral particles exit the host cell gradually without destroying it, but viral synthesis continues during this stage to produce components for new virions.
B. latency: In latency, the virus remains dormant within the host cell with little or no viral synthesis occurring. The genome persists in the host without active replication until reactivated.
C. lytic replication: In the lytic cycle, viral synthesis is highly active, producing viral proteins and genomes that ultimately cause cell lysis and release of new virions.
D. persistent infection: A persistent infection involves continuous viral replication at low levels, so viral synthesis is ongoing, not suspended.
E. oncogenesis: Oncogenesis refers to virus-induced cellular transformation leading to uncontrolled cell growth, but viral synthesis may still continue depending on the virus type.
Correct Answer is D
Explanation
A. Determine the type of yeast that would produce the best tasting wine: This relates to fermentation studies, particularly those of Louis Pasteur, rather than Koch’s postulates, which focused on linking specific microbes to specific diseases.
B. Determine why milk spoils: Milk spoilage investigations are associated with Pasteur’s work on microbes and pasteurization. Koch’s postulates were designed to establish causation between microbes and disease, not food preservation.
C. Disprove spontaneous generation: Disproving spontaneous generation was a key goal of Pasteur’s experiments using sterilized broths and flasks. Koch’s postulates, in contrast, provided a method to prove microbial causes of disease.
D. Prove the identity of the microbe that caused a disease: Koch’s postulates were developed to establish a clear, systematic method for identifying the specific microorganism responsible for a particular disease. This framework allowed scientists to link pathogens to illnesses with scientific rigor.
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