The pigment that absorbs light energy and gives green color to plants is: MCQ with Answer and Explanation

Explanation:
Human Immunodeficiency Virus (HIV), the causative agent of Acquired Immunodeficiency Syndrome (AIDS), is a retrovirus that specifically targets and destroys CD4+ T helper cells, which are crucial for coordinating the adaptive immune response. As the CD4+ count drops, the immune system becomes severely compromised, leading to opportunistic infections and certain cancers. Hepatitis B targets the liver, Herpes causes lesions, and Influenza targets the respiratory tract.

Explanation:
The right atrium receives deoxygenated blood from the systemic circulation via the superior and inferior vena cavae. It pumps blood to the right ventricle. The left atrium receives oxygenated blood from the lungs, the left ventricle pumps to the body, the right ventricle to the lungs.

Explanation:
Microinjection uses a very fine glass micropipette to inject DNA directly into the nucleus of a target cell. Electroporation uses electrical pulses, biolistics is gene gun for plant cells, lipofection uses lipid vesicles.