Which of the following is the primary cell line –
**Question:** Which of the following is the primary cell line -
A. HeLa
B. HepG2
C. CHO
D. NIH/3T3
**Correct Answer:** D. NIH/3T3
**Core Concept:** Primary cell lines are cultured cell lines derived from normal or tumor tissues, which retain certain characteristics of the original cells for extended periods of time. They are important for research purposes, including drug testing, viral replication studies, and molecular biology experiments.
**Why the Correct Answer is Right:** NIH/3T3 is a primary cell line derived from a mouse embryo fibroblast. It is widely used in scientific research due to its ease of culture, high growth rate, and ability to undergo multiple cell divisions. The correct answer is D because NIH/3T3 cells are a suitable model for studying mammalian cell biology, growth factors, and oncogenesis.
**Why Each Wrong Option is Incorrect:**
A. HeLa (Hela): Cervical cancer cell line derived from Henrietta Lacks' cancer cells. Although these cells are widely used, they are not considered a primary cell line due to their immortal nature and loss of characteristics over time.
B. HepG2: Hepatocellular carcinoma cell line derived from a patient's liver tissue. While HepG2 cells are utilized in research, they are not considered primary cell lines.
C. CHO (Chinese Hamster Ovary): A cell line derived from Chinese hamster ovary cells. CHO cells are often used in recombinant protein production but are not considered primary cell lines.
**Clinical Pearl:** Primary cell lines, such as NIH/3T3, are valuable tools in medical research due to their preserved characteristics and ease of culture. However, it is important to be aware of the limitations and characteristics of specific cell lines to ensure their appropriate utilization in scientific investigations.