Science Notes

BACTERIA (ADRE) BACTERIA Bacteria are **single-celled microorganisms** that belong to the domain of prokaryotes, which means they have cells that lack a true nucleus and other organelles. They are incredibly diverse, existing in a variety of shapes and sizes, and can be found in virtually every environment on Earth, from soil to water to the human body. Here are some key characteristics of bacteria: - Cell Structure : Bacteria have a simple cell structure without a nucleus or other membrane-bound organelles. Their genetic material is contained in a single, circular DNA strand located in a region called the nucleoid¹. - Cell Wall : Most bacteria have a strong cell wall made of peptidoglycan, which provides shape and protection.Certain bacteria possess an extra coating on their exterior known as a capsule. Shapes : The three main shapes of bacteria are cocci (spherical), bacilli (rod-shaped), and spirilla (spiral-shaped). - Reproduction : Bacteria typically reproduce asexuall...

DISEASE 🪰 PART 1 Certainly! Here are 20 multiple-choice questions (MCQs) related to various diseases, along with their answers: 1. **Tuberculosis is caused by:**    A) Virus    B) Bacteria    C) Fungi    D) Protozoa    **Answer: B) Bacteria** 2. **Which disease is characterized by the loss of bone density?**    A) Osteoporosis    B) Arthritis    C) Osteomalacia    D) Rickets    **Answer: A) Osteoporosis** 3. **Hepatitis affects which organ of the human body?**    A) Heart    B) Liver    C) Kidney    D) Lungs    **Answer: B) Liver** 4. **Malaria is transmitted by:**    A) Contaminated water    B) Airborne droplets    C) Aedes mosquito    D) Anopheles mosquito    **Answer: D) Anopheles mosquito** 5. **Which is not a cardiovascular disease?**    A) Hypertension    B) Strok...