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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: Types of RNA, Genetic Code and Protein Translation — Lesson quiz

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1.
The stop codons that signal termination of translation on an mRNA molecule include:
AUG, UAA, UGA
UAC, UGG, UAA
UAA, UAG, UGA
GUA, CAU, UAG
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.
Cuticle thickness over leaf epidermis doubles within minutes.
Lignin is immediately deposited inside the xylem vessel walls.
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 I-band (light isotropic zone)
The distance between two successive Z-lines
The H-zone (central semi-light region)
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
12 vertebrae
4 vertebrae
5 vertebrae
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