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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: Support in Plants and the Human Skeletal System — Lesson quiz

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1.
Physiological support in plant cells directly depends upon which biological process?
Water entry into the vacuole via osmosis generating turgor pressure
Synthesis of suberin in the root cortex
Active transport of sodium ions out of the cytoplasm
Lignin deposition on the primary cell wall
2.
What is the total number of bones constituting the adult human vertebral column?
33 bones
26 bones
24 bones
206 bones
3.
Which of the following pairs of ribs are classified as floating ribs?
1st and 2nd pairs
8th, 9th, and 10th pairs
11th and 12th pairs
7th and 8th pairs
4.
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 involves permanent deposition of lignin in stone cells
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
5.
According to the Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Sliding Filament Theory of Muscle Contraction (Huxley)?
Cross-bridges pull actin filaments outward away from the M-line
During sarcomere contraction, actin filaments slide over myosin filaments; the I-band and H-zone shorten, while the A-band length remains strictly constant
Both A-band and myosin filaments shrink by 50% in length
Z-lines move away from each other as the muscle contracts
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