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Curriculum and course: Biology

Curriculum and course: Biology

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Chapter 2 - Molecular Biology and Earth Science1 Annotated lessons + question banks and assessments

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Lesson 1 Quiz: Support and Movement in Living Organisms

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  • Questions count: 4
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1.
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.
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.
2.
During maximal skeletal muscle contraction according to Huxley's sliding filament model, which region experiences NO change in its absolute length?
The H-zone (central semi-light region)
The distance between two successive Z-lines
The A-band (dark anisotropic zone)
The I-band (light isotropic zone)
3.
What is the biochemical cause of continuous, non-relaxing muscle spasm that can cause muscular tearing?
Sudden accumulation of glucose inside glycogen granules.
Abrupt accumulation of excessive calcium ions in the synaptic cleft.
Complete depletion of cellular ATP molecules, preventing cross-bridge detachment.
Excessive breakdown of acetylcholine by the enzyme acetylcholinesterase.
4.
How many cervical vertebrae are present in the adult human vertebral column?
5 vertebrae
12 vertebrae
7 vertebrae
4 vertebrae
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