The common cold is primarily caused by which virus?
A. Adenovirus
B. Coronavirus
C. Rhinovirus
D. Influenza virus
Answer: Option C
Solution (By JKExamLibrary)
The common cold is a viral infectious disease of the upper respiratory tract. While many viruses can cause it, Rhinoviruses are the most common causative agents, responsible for 30-50% of cases. Coronaviruses and adenoviruses can also cause colds. Influenza virus causes the flu, which is a more severe respiratory illness.
Explanation:
The liver is the primary organ for glycogenesis (storing glucose as glycogen) and glycogenolysis, maintaining blood glucose levels. Muscles store glycogen for local use. Pancreas regulates via hormones, kidneys excrete excess glucose.
Explanation:
Prokaryotic cells lack a true nucleus; their genetic material is located in a nucleoid region. They possess 70S ribosomes (50S+30S subunits), whereas eukaryotic cells have 80S ribosomes. Prokaryotes generally have a cell wall (except Mycoplasma) and circular DNA, not linear. Membrane-bound organelles like mitochondria, ER are absent. Examples: bacteria and blue-green algae. This distinction is fundamental in cell biology.
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