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Biology & Geology

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 2: The Human Immune System (Organs, Cells, and Antibodies) — Lesson quiz

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1.
Which immunoglobulin possesses ten antigen-binding sites and is most effective in the agglutination mechanism?
IgA
IgM
IgE
IgG
2.
Which of the following cellular changes occurs directly when a wilted plant shoot is irrigated with fresh water?
Cuticle thickness over leaf epidermis doubles within minutes.
Cell sap osmotic pressure increases and cell wall shrinks inward.
Water enters the vacuole via osmosis, expanding turgor pressure against the cell wall.
Lignin is immediately deposited inside the xylem vessel walls.
3.
During maximal skeletal muscle contraction according to Huxley's sliding filament model, which region experiences NO change in its absolute length?
The H-zone (central semi-light region)
The distance between two successive Z-lines
The A-band (dark anisotropic zone)
The I-band (light isotropic zone)
4.
What is the biochemical cause of continuous, non-relaxing muscle spasm that can cause muscular tearing?
Abrupt accumulation of excessive calcium ions in the synaptic cleft.
Sudden accumulation of glucose inside glycogen granules.
Excessive breakdown of acetylcholine by the enzyme acetylcholinesterase.
Complete depletion of cellular ATP molecules, preventing cross-bridge detachment.
5.
How many cervical vertebrae are present in the adult human vertebral column?
5 vertebrae
12 vertebrae
7 vertebrae
4 vertebrae
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