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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: Identification of DNA as Genetic Material — Lesson quiz

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1.
Hershey and Chase successfully exploited which elemental difference to distinguish DNA from protein in bacteriophages?
Phosphorus in DNA vs. Sulfur in proteins
Oxygen in DNA vs. Hydrogen in proteins
Nitrogen in DNA vs. Carbon in proteins
Potassium in DNA vs. Sodium in proteins
2.
Which of the following cellular changes occurs directly when a wilted plant shoot is irrigated with fresh water?
Lignin is immediately deposited inside the xylem vessel walls.
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.
3.
During maximal skeletal muscle contraction according to Huxley's sliding filament model, which region experiences NO change in its absolute length?
The distance between two successive Z-lines
The H-zone (central semi-light region)
The I-band (light isotropic zone)
The A-band (dark anisotropic zone)
4.
What is the biochemical cause of continuous, non-relaxing muscle spasm that can cause muscular tearing?
Complete depletion of cellular ATP molecules, preventing cross-bridge detachment.
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.
5.
How many cervical vertebrae are present in the adult human vertebral column?
7 vertebrae
4 vertebrae
12 vertebrae
5 vertebrae
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