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Biology & Geology (STEM)

Chapter 2 - Hormonal Coordination in Living Organisms

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Chapter 3 - Reproduction in Living Organisms

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Chapter 4 - Immunity in Living Organisms

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Chapter 5 - Molecular Biology - DNA Structure and Function

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Chapter 6 - Molecular Biology - RNA, Protein Synthesis and Genetic Engineering

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Quiz

Lesson 1: Endocrine Glands, The Pituitary, Thyroid and Parathyroid Glands — Lesson quiz

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1.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Physiological vs. Structural Support in Plants?
Both physiological and structural supports disappear immediately when the plant wilts
Structural support relies solely on turgor pressure of living parenchyma
Physiological support is temporary and completely dependent on water uptake into vacuoles via osmosis, while structural support is permanent via deposition of cellulose, lignin, or suberin
Physiological support involves permanent deposition of lignin in stone cells
2.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Sliding Filament Theory of Muscle Contraction (Huxley)?
Both A-band and myosin filaments shrink by 50% in length
Cross-bridges pull actin filaments outward away from the M-line
Z-lines move away from each other as the muscle contracts
During sarcomere contraction, actin filaments slide over myosin filaments; the I-band and H-zone shorten, while the A-band length remains strictly constant
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