Question: Which of the following is the first completed and published gene sequence?
A M13 phage
B T4 phage
C f×174
D Lambda phage
Answer: f×174
| Gene Sequence | Organism | Year of Publication | Significance and Notes |
| f×174 | Bacteriophage | 1977 | First DNA genome sequenced. |
| Human Mitochondrial DNA | Human (Homo sapiens) | 1981 | First human genome sequenced. |
| T4 Bacteriophage | Bacteriophage | 1982 | Early viral genome sequencing. |
| E. coli K-12 | Bacterium (Escherichia coli) | 1997 | Model bacterium genome. |
| Saccharomyces cerevisiae | Yeast | 1996 | Model eukaryotic genome, important for studying genetics. |
| Haemophilus influenzae | Bacterium | 1995 | First free-living organism genome sequenced. |
| Caenorhabditis elegans | Nematode | 1998 | Model organism for developmental biology. |
| Drosophila melanogaster | Fruit fly | 2000 | Important model organism in genetics and developmental biology. |
| Arabidopsis thaliana | Plant (Thale cress) | 2000 | Model plant genome for studying plant biology. |
| Human Genome | Human (Homo sapiens) | 2001 | Landmark achievement in mapping the entire human genome. |