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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.
Bacteria protect their endogenous chromosomal DNA from self-digestion by their own restriction endonucleases through:
Nuclear membrane compartmentalization
Synthesis of protective histone proteins
Rapid degradation of the enzymes
Methylation of recognition sites by modification enzymes
2.
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.
3.
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 A-band (dark anisotropic zone)
The distance between two successive Z-lines
The H-zone (central semi-light region)
4.
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.
5.
How many cervical vertebrae are present in the adult human vertebral column?
7 vertebrae
5 vertebrae
4 vertebrae
12 vertebrae
  • 1
  • 2
  • 3
  • 4
  • 5