Which of the following is found in prokaryotic cells?
mitochondria
lysosomes
ribosomes
All of the above
The Correct Answer is C
A. Mitochondria: Prokaryotic cells do not contain mitochondria. Instead, they generate energy through processes that occur across the plasma membrane. They are found exclusively in eukaryotic cells and are absent in prokaryotes.
B. Lysosomes: Lysosomes are membrane-bound organelles found only in eukaryotic cells. Prokaryotes lack these structures and instead rely on enzymes within the cytoplasm for breakdown processes.
C. Ribosomes: Ribosomes are present in prokaryotes and eukaryotes, serving as the site of protein synthesis. In prokaryotes, they are smaller (70S type) but functionally equivalent to those in eukaryotes.
D. All of the above: This is incorrect because prokaryotes do not contain mitochondria or lysosomes.
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Related Questions
Correct Answer is C
Explanation
A. Enzymes are made of protein: Enzymes are primarily composed of protein molecules that fold into specific three-dimensional shapes, enabling them to catalyze biochemical reactions efficiently.
B. Enzymes can be denatured: Enzymes can lose their functional shape, or become denatured, when exposed to extreme temperatures, pH levels, or chemical agents, which impairs their catalytic activity.
C. Enzymes can only work one time: Enzymes are not used up in reactions; they can catalyze the same type of reaction repeatedly without being consumed.
D. Enzymes can be found in biological organisms: Enzymes are naturally present in all living organisms, where they facilitate essential metabolic and physiological processes.
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.
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