Measles is caused by a virus. The measles virus is highly contagious and spreads through respiratory droplets when an infected person coughs or sneezes. It can lead to serious complications such as pneumonia and encephalitis.
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SARS is a viral disease. It stands for Severe Acute Respiratory Syndrome and is caused by the SARS coronavirus (SARS-CoV). It leads to severe respiratory illness with symptoms such as fever, cough, and difficulty breathing.
A virus contains nucleic acid and protein. The nucleic acid, either DNA or RNA, carries the virus’s genetic information. This is encased in a protein coat called a capsid, which protects the genetic material and helps the virus attach to ...
AIDS spreads by physical contact, specifically through direct exchange of bodily fluids such as blood, semen, vaginal fluids, and breast milk. It can also spread through shared needles or from mother to child during childbirth or breastfeeding.
AIDS virus, known as HIV, is a single-stranded RNA virus. It belongs to the retrovirus family and uses reverse transcriptase to convert its RNA into DNA, which integrates into the host’s genome. This integration allows the virus to replicate and ...
HIV is a disease caused by the human immunodeficiency virus (HIV), which leads to acquired immunodeficiency syndrome (AIDS). It is not caused by tuberculosis, fever disease, or cancer. The virus attacks the immune system, particularly CD4 cells, making the body ...
Enzymes are absent in viruses. Viruses lack cellular structure and do not carry out metabolic processes independently. They rely on host cells for replication and do not possess their own enzymes for metabolism.
The continent with the most countries is Asia. With a total of 49 countries, Asia holds the distinction of being the continent with the highest number of independent nations. Its vast landmass encompasses a diverse range of cultures, languages, and ...
The continent with a complete absence of volcanoes is Australia. While Australia has a diverse range of landscapes, including deserts, mountains, and coastlines, it lacks active volcanoes. This absence is due to Australia being located in the middle of the ...
The Tropics of Cancer, Equator, and Capricorn pass through the continents of Africa and South America. These geographical lines demarcate important latitudinal zones on the Earth, including the Equator at 0 degrees latitude and the Tropics of Cancer and Capricorn ...