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Biology & Geology

Chapter 1 - Support and Movement in Living Organisms

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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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Chapter 7 - Geology, Earth Sciences and Ecology

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Quiz

Lesson 2: DNA Structure, Replication and DNA Repair Enzymes — Lesson quiz

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  • Questions count: 5
  • Passing grade: 60%
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1.
If a double-stranded DNA molecule contains 20% Cytosine, what is the percentage of Adenine?
30%
60%
20%
40%
2.
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.
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.
3.
During maximal skeletal muscle contraction according to Huxley's sliding filament model, which region experiences NO change in its absolute length?
The A-band (dark anisotropic zone)
The I-band (light isotropic zone)
The H-zone (central semi-light region)
The distance between two successive Z-lines
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.
Excessive breakdown of acetylcholine by the enzyme acetylcholinesterase.
Complete depletion of cellular ATP molecules, preventing cross-bridge detachment.
Sudden accumulation of glucose inside glycogen granules.
5.
How many cervical vertebrae are present in the adult human vertebral column?
5 vertebrae
12 vertebrae
4 vertebrae
7 vertebrae
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