Peptidoglycan is a unique macromolecule found in bacterial
cell walls.
cell membranes.
capsules.
slime layers.
inclusions.
The Correct Answer is A
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.
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Related Questions
Correct Answer is C
Explanation
A. Bacteria: Most bacteria reproduce by binary fission, where the cell divides evenly into two identical daughter cells. Budding is not a typical method of bacterial reproduction.
B. Algae: Algae generally reproduce through binary fission, fragmentation, or sexual reproduction, but budding is not their main reproductive mechanism.
C. Yeast: Yeast, a type of fungus, often reproduce by budding, where a small outgrowth develops on the parent cell, enlarges, and eventually separates as a new individual cell.
D. Protozoa: Protozoa usually reproduce by binary fission or multiple fission, with some species reproducing sexually, but they do not reproduce by budding.
Correct Answer is D
Explanation
A. growing corn plants with various amounts of fertilizer: Using corn plants introduces a different species, which makes results irrelevant to the effect of fertilizer on tomato plants.
B. growing tomato plants with various amounts of fertilizer: This is part of the experimental group rather than a control, as it tests different fertilizer levels rather than providing a baseline for comparison.
C. growing corn plants without fertilizer: Corn plants are not suitable because the research question focuses on tomato plants. A valid control must match the species being studied.
D. growing tomato plants without fertilizer: This is the correct control, as it provides a baseline growth rate for tomato plants without fertilizer, allowing meaningful comparison with fertilized groups.
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