The enzyme used to join DNA fragments in genetic engineering is: MCQ with Answer and Explanation

Explanation:
African sleeping sickness (trypanosomiasis) is caused by the protozoan Trypanosoma brucei, transmitted by the tsetse fly (Glossina). Malaria is by Plasmodium (Anopheles mosquito), filariasis by Wuchereria (Culex), yellow fever by a virus (Aedes). Sleeping sickness affects the central nervous system, causing lethargy, coma, and death if untreated.

Explanation:
The four pulmonary veins drain oxygen-rich blood from the lungs into the left atrium. The pulmonary artery carries deoxygenated blood from right ventricle to lungs. Vena cava brings deoxygenated blood to right atrium.

Explanation:
Transformation is the direct uptake and incorporation of naked DNA from the surroundings by a bacterium. Conjugation is DNA transfer via pilus, transduction via phage, lysogeny is phage DNA integration.