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

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1.
Which hormone acts to decrease blood calcium levels when they rise above normal physiological limits?
Calcitonin
Parathormone
Aldosterone
Thyroxine
2.
Hypersecretion of Growth Hormone (GH) in adult individuals leads clinically to:
Dwarfism
Myxedema
Acromegaly
Gigantism
3.
Which of the following cellular changes occurs directly when a wilted plant shoot is irrigated with fresh water?
Water enters the vacuole via osmosis, expanding turgor pressure against the cell wall.
Cuticle thickness over leaf epidermis doubles within minutes.
Cell sap osmotic pressure increases and cell wall shrinks inward.
Lignin is immediately deposited inside the xylem vessel walls.
4.
During maximal skeletal muscle contraction according to Huxley's sliding filament model, which region experiences NO change in its absolute length?
The I-band (light isotropic zone)
The H-zone (central semi-light region)
The distance between two successive Z-lines
The A-band (dark anisotropic zone)
5.
What is the biochemical cause of continuous, non-relaxing muscle spasm that can cause muscular tearing?
Excessive breakdown of acetylcholine by the enzyme acetylcholinesterase.
Sudden accumulation of glucose inside glycogen granules.
Abrupt accumulation of excessive calcium ions in the synaptic cleft.
Complete depletion of cellular ATP molecules, preventing cross-bridge detachment.
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