Which of the following is found in eukaryotic cells but not in prokaryotic cells?
nucleus
mitochondria
endoplasmic reticulum
lysosomes
All of the above
The Correct Answer is E
A. nucleus: Eukaryotic cells contain a nucleus enclosed by a nuclear membrane, while prokaryotic cells lack a true nucleus and instead have DNA freely floating in the cytoplasm.
B. mitochondria: Mitochondria are double-membraned organelles responsible for energy production through cellular respiration, and they are absent in prokaryotic cells.
C. endoplasmic reticulum: The endoplasmic reticulum (rough and smooth) is a membrane-bound organelle involved in protein and lipid synthesis, which is not present in prokaryotes.
D. lysosomes: Lysosomes contain digestive enzymes that break down cellular waste and macromolecules; this organelle is unique to eukaryotic cells.
E. All of the above: All the listed organelles and structures are characteristic of eukaryotic cells and absent in prokaryotes.
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Related Questions
Correct Answer is C
Explanation
A. A compound that removes H+ ions from a solution: This describes a base, since bases decrease hydrogen ion concentration by binding or neutralizing H+ ions, which is the opposite of what acids do.
B. A compound that releases OH- ions into a solution: This also characterizes a base, such as sodium hydroxide, which increases hydroxide ion concentration rather than contributing hydrogen ions.
C. A compound that releases H+ ions into a solution: Acids are substances that increase the hydrogen ion concentration in a solution by releasing H+ ions, making the solution more acidic and lowering its pH.
Correct Answer is B
Explanation
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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