**Question 21**A strain of *Neisseria gonorrhoeae* has a mutation which has caused it to lose the ability to produce functional lipid A and has become less virulent as a consequence. What function has it lost?- a. the ability to prevent phagocytes killing it- b. the ability to produce an endotoxin- c. the ability to adhere to cells of the body- d. the ability to resist antibiotics- e. the ability to establish a latent infection**Question 22**A communicable disease that can be easily transmitted from person to person is which type of disease?- o contagious- o iatrogenic- o nosocomial- o acute**Question 23**Organisms such as *Mycobacterium tuberculosis* that produce mycolic acid are associated with:- a. damaging collagen- b. damaging the nervous system- c. damaging red blood cell membranes- d. surviving phagocytosis

Disclaimer: The first question 21 is incomplete, that's why answering only question no 22 and 23. Disease: Disease is any adverse variation from an organism's normal structural or functional condition that is typically accompanied by a set of symptoms and is distinct from bodily injury in origin. A diseased organism frequently displays symptoms or indicators that point to its aberrant condition. It is a abnormal condition of body where some part or organ does not function well. 22) The correct option is : Contagious Contagious disease are those disease which spread from one person to other person by various ways. One way involves having direct physical contact with an infected individual, such as by touching or kissing them. Another way is when an airborne infectious bacterium spreads after a close sneeze or cough. For example, if a infected person touches a normal person then normal person will also get infected. Other incorrect options Iatrogenic: This option is incorrect because iatrogenic disease was characterized as a condition brought on by a medicine that a doctor recommended, or one that develops during a diagnostic or therapeutic treatment. Nosocomial: This option is incorrect because nosocomial infections, also known as healthcare-associated infections (HAI), are an infection or illnesses that develop while undergoing medical treatment but were absent at the time of admission. Acute: This option is incorrect because acute disorders develop quickly, have recognizable symptoms, necessitate immediate medical attention, or both, and improve after treatment.23) The correct option is : Surviving phagocytosis Mycolic acid it the components of cell wall of bacteria. Mycobacteria, such as the tubercle bacillus Mycobacterium tuberculosis, contain mycolic acids, which are distinct long chain fatty acids present in their lipid-rich cell walls. It is very hydrophobic and create a waxy surface over the cell wall which protects the bacteria from phagocytosis by macrophages. Other incorrect options Option a: This option is incorrect because it provide bacteria drug resistance. Option b: This option is incorrect because the survival of species of the genus Mycobacterium depends on the presence of mycolic acids, which are important and distinctive lipid components of the mycobacterial cell envelope. Option c: This option is incorrect because the survival of species of the genus Mycobacterium depends on the presence of mycolic acids, which are important and distinctive lipid components of the mycobacterial cell envelope.