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- Subject
- Biology Mcqsbiology-mcqs
- Published
- 23 May 2018
- Last updated
- 28 May 2026
Explanation
The secondary cell wall of sclerenchyma cells is heavily impregnated with lignin, which provides rigidity and strength. Cellulose is a primary component of cell walls but lignin specifically reinforces the secondary wall. Peptidoglycan and murein are found in bacterial cell walls, and pectin is mainly present in primary walls and middle lamella.
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- 4.Which field focuses on examining the interactions between antigens and antibodies present in the blood?
- 5.Which scientific discipline focuses on organizing and categorizing living organisms?
- 6.In the scientific name Homo sapiens, which two taxonomic categories are represented by the Latin terms?
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- 8.Which of the following conditions is commonly associated with multiple opportunistic infections?