PPSC Punjab Police All Past Papers

The correct answer is Proteins because proteins serve as the fundamental structural building blocks required to assemble, maintain, and repair human cells and tissues.

• Step 1 (Structural Biology): Proteins are complex molecules built out of long chains of amino acids. Muscle fibers are comprised of structural proteins like actin and myosin, while blood components rely heavily on proteins like hemoglobin (to carry oxygen) and albumin.


• Incorrect Options:
  
  
  
  • Carbohydrates is incorrect because carbohydrates function primarily as short-term energy fuel for cells rather than serving as structural tissue building blocks.
  
  
  • Vitamins is incorrect because vitamins are organic micro-nutrients required in small concentrations to regulate metabolic pathways, rather than forming physical tissue structures.
  
  
  • Fats is incorrect because fats (lipids) are utilized for long-term energy storage, cell membrane boundaries, and insulation rather than constructing muscle masses.
  
  

The correct answer is 300 because infants are born with a skeleton containing roughly 300 separate elements composed largely of flexible cartilage.

• Step 1 (Skeletal Development): A newborn infant has roughly 94 more bones than a fully grown adult. This flexible structural design is essential to allow the baby to fit safely through the birth canal and accommodate rapid infant growth.


• Step 2 (The Ossification Process): As the child develops through childhood, a biological process called ossification takes place. This causes separate soft cartilage segments to gradually fuse together into solid bone, lowering the total count to 206 by adulthood.


• Incorrect Options:
  
  
  
  • 200 is incorrect because it falls below the standard adult skeletal baseline count of 206 bones.
  
  
  • 250 is incorrect because it underrepresents the true separate bone segment configurations found at birth.
  
  
  • None of these is incorrect because 300 is the widely accepted biomedical average benchmark.