Mycoplasmas are pleomorphic because they
have no cell walls.
produce endospores.
exhibit snapping division.
have sterols in their cytoplasmic membranes.
The Correct Answer is A
A. Have no cell walls: Mycoplasmas lack a rigid cell wall, which allows them to adopt variable shapes, making them pleomorphic. Without a cell wall, they are more flexible and can change form depending on environmental conditions.
B. Produce endospores: Endospore production is a survival mechanism seen in genera like Bacillus and Clostridium. Mycoplasmas do not produce endospores.
C. Exhibit snapping division: Snapping division is a method of reproduction in some bacteria like Corynebacterium, but it does not cause the broad variability in shape observed in Mycoplasmas.
D. Have sterols in their cytoplasmic membranes: Sterols provide structural support to stabilize the flexible membrane of Mycoplasmas, but pleomorphism results primarily from the absence of a rigid cell wall rather than sterol presence.
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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 E
Explanation
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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