Which of the following organelles is found in both prokaryotes and eukaryotes?
Mitochondria
Ribosomes
Nucleus
Lysosomes
All of the above
The Correct Answer is B
A. Mitochondria: Mitochondria are double-membrane organelles responsible for energy production in eukaryotic cells, but they are absent in prokaryotes.
B. Ribosomes: Ribosomes are present in both prokaryotes and eukaryotes, serving as the site of protein synthesis. Though their size differs (70S in prokaryotes and 80S in eukaryotes), their essential function is conserved across all cells.
C. Nucleus: The nucleus is a defining feature of eukaryotic cells, containing DNA within a membrane, but prokaryotes lack a true nucleus and instead have a nucleoid region.
D. Lysosomes: Lysosomes are membrane-bound organelles containing digestive enzymes, found in eukaryotes only and absent in prokaryotic cells.
E. All of the above: Not all listed organelles are found in both cell types, so this option is inaccurate since only ribosomes are shared universally.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Aquatic: Aquatic refers to environments or organisms related to water, but it does not describe a chemical process in which bonds are broken.
B. Hydrolysis: Hydrolysis is the reaction where water is used to split covalent bonds, breaking larger molecules into smaller subunits. This process is common in digestion and cellular metabolism.
C. Dehydration (or condensation): Dehydration involves removing water to form covalent bonds between molecules, which is the opposite of hydrolysis and results in larger compounds.
D. Hydratic: Hydratic is not a recognized term in chemistry for describing bond-breaking reactions, and it does not apply to hydrolytic processes.
Correct Answer is B
Explanation
A. cell culture: Viruses can be grown in cell cultures, where living host cells provide the machinery necessary for viral replication. This is a common laboratory method.
B. nutrient media: Viruses cannot grow on nutrient media alone because they require living host cells for replication. Nutrient media supports bacterial and fungal growth, not viruses.
C. lab animals: Some viruses require whole organisms for propagation, so laboratory animals can be used as hosts to study pathogenesis and replication.
D. embryonated eggs: Embryonated chicken eggs provide a supportive environment for viral growth and are widely used for vaccine production, such as influenza vaccines.
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