Which disease is caused by the bacterium Salmonella typhi? MCQ with Answer and Explanation

Explanation:
DNA polymerase I has 5' to 3' exonuclease activity to remove RNA primers and fill gaps with DNA. In eukaryotes, RNase H removes primers.

Explanation:
The biceps brachii is a two-headed muscle located in the upper arm, responsible for flexing the elbow. The quadriceps femoris is a large, four-headed muscle group in the front of the thigh, extending the knee. The diaphragm is a dome-shaped skeletal muscle that forms the floor of the thoracic cavity and the roof of the abdominal cavity, crucial for breathing. All statements are correct.

Explanation:
The Mesozoic era (about 250-65 million years ago) is called the 'Age of Reptiles' or 'Age of Dinosaurs' because reptiles, especially dinosaurs, dominated terrestrial ecosystems. It is divided into Triassic, Jurassic, and Cretaceous periods. The Cenozoic is the 'Age of Mammals', the Paleozoic saw the rise of fishes and amphibians, and the Proterozoic is earlier.