Cell Biology

Step 1: Understand what surface area to volume ratio means
The surface area to volume ratio (SA:V) is an important factor in determining the efficiency of material exchange (like oxygen, nutrients, and waste) across the cell membrane.
Step 2: Consider the structure of RBCs
Red Blood Cells (RBCs) are biconcave disc-shaped, which gives them a large surface area relative to their volume. This feature allows for rapid gas exchange, especially oxygen and carbon dioxide.
Step 3: Compare with other cell types
Fibroblasts are elongated cells involved in structural frameworks.
Keratinocytes are large, flat cells forming the outer skin layer.
Hepatocytes are large polygonal liver cells with high metabolic activity. None of these have a surface area to volume ratio higher than RBCs.

Step 1: Understanding Herpes Simplex Virus (HSV)
HSV is a DNA virus that causes infections such as cold sores (HSV-1) or genital herpes (HSV-2). After the initial infection, the virus does not get completely eliminated from the body.
Step 2: Site of Latency
The herpes simplex virus remains latent in the sensory neurons, particularly in the dorsal root ganglia (for HSV-2) or trigeminal ganglia (for HSV-1).
During latency, the viral genome persists in the neuron nucleus as an episome without producing new virions.
Step 3: Reactivation
Under stress or immunosuppression, the virus can reactivate and travel back along the axons to infect epithelial cells again, causing symptomatic lesions. Hence, the correct answer is: Neuronal cells.