The 'Bundle of His' and 'Purkinje fibers' are specialized structures found in the: MCQ with Answer and Explanation

The 'Bundle of His' and 'Purkinje fibers' are specialized structures found in the:
A. Brain
B. Kidneys
C. Lungs
D. Heart
Answer: Option D
Solution (By JKSSB Mock Tests)
The Bundle of His and Purkinje fibers are part of the electrical conduction system of the heart. The Bundle of His carries the electrical impulse from the atrioventricular (AV) node down the interventricular septum. It then divides into right and left bundle branches, which terminate in the Purkinje fibers. These fibers rapidly distribute the impulse throughout the ventricular myocardium, ensuring coordinated ventricular contraction.

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Practice More Biology Questions

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The process of converting mRNA information into a polypeptide chain is:
A. Transduction
B. Replication
C. Transcription
D. Translation

Correct Answer: Option D


Explanation:
Translation is the synthesis of a polypeptide chain at the ribosome, where the genetic code in mRNA is read by tRNA anticodons to assemble amino acids in the correct order. Transcription produces mRNA from DNA, replication duplicates DNA, transduction is gene transfer by viruses. Translation involves initiation, elongation, and termination factors.

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Question #2
Which of the following statements about the food chain is correct?
A. Energy increases at each trophic level.
B. A grazing food chain starts with living plants.
C. Decomposers are at the top of the food chain.
D. Producers are always animals.

Correct Answer: Option B


Explanation:
Grazing food chain begins with producers (plants). Decomposers break down dead matter at all levels; energy decreases at higher levels; producers are plants/algae.

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Question #3
The enzyme in saliva that begins starch digestion is:
A. Pepsin
B. Lipase
C. Trypsin
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Correct Answer: Option D


Explanation:
Salivary amylase (ptyalin) hydrolyzes starch into maltose and dextrins in the mouth. It functions optimally at neutral to slightly alkaline pH. Pepsin digests proteins in the stomach, lipase digests fats, trypsin is a pancreatic protease. Salivary amylase action ceases in the acidic stomach.

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