Understanding Biological Molecules and Structures

The question asks us to identify the option where a group of three items is correctly paired with its biological category. Let's examine each option carefully to determine the category of each item listed.

Analyzing Each Pairing

We will break down each option and determine the correct category for each listed item.

Option 1: Lysine, Glycine, Thymine - Amino acids

• Lysine: This is an amino acid, specifically an essential amino acid.
• Glycine: This is also an amino acid, the simplest one.
• Thymine: This is a nitrogenous base, specifically a pyrimidine base, found in DNA. It is not an amino acid.

Since Thymine is a nitrogenous base and not an amino acid, this pairing is incorrect.

Option 2: Myosin, Oxytocin, Gastrin - Hormones

• Myosin: This is a motor protein found in muscle cells, responsible for muscle contraction. It is not a hormone.
• Oxytocin: This is a peptide hormone produced in the hypothalamus and released by the pituitary gland.
• Gastrin: This is a peptide hormone produced in the stomach and small intestine.

Since Myosin is a protein and not a hormone, this pairing is incorrect.

Option 3: Renin, Helicase, Hyaluronidase - Enzymes

• Renin: This is an enzyme produced by the kidneys that plays a crucial role in the renin-angiotensin-aldosterone system, which regulates blood pressure.
• Helicase: This is an enzyme that unwinds nucleic acid strands (like DNA or RNA) during processes like DNA replication, transcription, and repair.
• Hyaluronidase: This is an enzyme that breaks down hyaluronic acid, a major component of connective tissue.

All three substances listed – Renin, Helicase, and Hyaluronidase – are enzymes. Therefore, this pairing is correct.

Option 4: Optic nerve, Oculomotor, Vagus - Sensory nerves

These are cranial nerves. Let's look at their primary functions:

• Optic nerve (Cranial Nerve II): Primarily sensory, responsible for vision.
• Oculomotor nerve (Cranial Nerve III): Primarily motor, controls most eye movements and pupillary constriction.
• Vagus nerve (Cranial Nerve X): A mixed nerve containing both sensory and motor fibers, innervating various organs in the chest and abdomen.

While the Optic nerve is sensory, the Oculomotor is primarily motor, and the Vagus is mixed. Thus, they are not all sensory nerves. This pairing is incorrect.

Conclusion

Based on the analysis of each option, the group containing Renin, Helicase, and Hyaluronidase is correctly categorized as Enzymes, as all three substances function as biological catalysts.