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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Cell walls: Peptidoglycan is the main structural component of bacterial cell walls, providing rigidity and shape while protecting against osmotic pressure. It is especially thick in Gram-positive bacteria and thinner in Gram-negative ones.
B. Cell membranes: The bacterial cell membrane is composed of a phospholipid bilayer with proteins for transport and signaling, but it does not contain peptidoglycan.
C. Capsules: Capsules are made of polysaccharides or polypeptides that help bacteria evade the immune system, but they lack peptidoglycan.
D. Slime layers: Slime layers, like capsules, consist of polysaccharides and serve mainly for adhesion and protection, not structural rigidity from peptidoglycan.
E. Inclusions: Inclusions are storage sites for nutrients such as glycogen, sulfur, or polyphosphate, and they do not involve peptidoglycan in their structure.
Correct Answer is B
Explanation
A. Order of complexity: Order of complexity refers to the organized structure of living systems, from molecules to cells to organisms. While organization is important, it does not directly describe the ability to respond to a stimulus.
B. Sensitivity: Sensitivity is the capacity of an organism to detect and respond to changes or stimuli in its environment. This characteristic allows living beings to adapt behaviorally or physiologically, ensuring survival and interaction with their surroundings.
C. Evolution: Evolution involves gradual genetic changes in populations over generations. It explains long-term adaptation but does not account for an immediate response to a stimulus by an individual organism.
D. Homeostasis: Homeostasis is the maintenance of internal stability, such as temperature or pH, despite external changes. While it can involve responses, it specifically refers to regulation rather than reacting to a particular stimulus.
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