Which of the following is a non-renewable energy resource?
A. Solar energy
B. Wind energy
C. Coal
D. Tidal energy
Answer: Option C
Solution (By JKSSB Mock Tests)
Coal is a fossil fuel formed over millions of years and is finite, thus non-renewable. Solar, wind, and tidal energy are renewable and replenishable. Non-renewable resources include coal, petroleum, natural gas, and nuclear minerals. Overexploitation leads to depletion and environmental pollution. Conservation of such resources is essential for sustainable development.
Explanation:
The nucleolus is a dense spherical structure within the nucleus where ribosomal RNA (rRNA) is transcribed and ribosomal subunits are assembled. They then exit to the cytoplasm. The cytoplasm is the site of translation. Mitochondria have their own 70S ribosomes but their rRNA is synthesized within the organelle. Golgi modifies proteins.
Consider statements about the cell wall: 1. Plant cell walls are made of cellulose. 2. Fungal cell walls contain chitin. 3. Bacterial cell walls contain peptidoglycan. Which are correct?
Explanation:
The cell wall composition varies across kingdoms. Plant cell walls are primarily composed of cellulose, a complex polysaccharide. Fungal cell walls are characterized by the presence of chitin, providing structural rigidity. Bacterial cell walls consist of peptidoglycan (murein). Therefore, all three statements accurately describe the cell wall composition of these respective groups.
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