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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: Recombinant DNA, Gene Cloning, PCR and Genetic Engineering — Lesson quiz

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1.
Which of the following cellular changes occurs directly when a wilted plant shoot is irrigated with fresh water?
Cell sap osmotic pressure increases and cell wall shrinks inward.
Lignin is immediately deposited inside the xylem vessel walls.
Water enters the vacuole via osmosis, expanding turgor pressure against the cell wall.
Cuticle thickness over leaf epidermis doubles within minutes.
2.
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.
Complete depletion of cellular ATP molecules, preventing cross-bridge detachment.
Abrupt accumulation of excessive calcium ions in the synaptic cleft.
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