Question

which of the following types of molecules would you suspect comprises an S. pneumoniae capsule? 1. monosaccharide carbohydrate 2. triglyceride lipid 3. polysaccharide carbohydrate 4. disaccharide carbohydrate 5. adenosine triphosphate

Answer 1

Answer: S. pneumoniae capsule consist of polysaccharide carbohydrate. The correct option is 3.

Explanation: Streptococcus pneumoniae is a gram positive facultative organism found in the genus Streptococcus. It has the ability to cause infection through a number of virulent factors it has such as

- invasins and

- capsule.

The capsule of S. Pneumoniae is made up of repeated chains of polysaccharide carbohydrate. The capsule protects the bacteria from:

-phagocytosis,

-complement-mediated immunity and

-opsonophagocytic killing,

- reduces capture of pneumococci by neutrophil extracellular traps aNd

- prevents entrapment of S. pneumoniae in airway mucus which in turn limits mucus-mediated clearance.

Answer 2

Answer:The correct answer is "d": polysaccharide carbohydrate.

Step-by-step explanation:

Streptococcus pneumoniae,also known as pnumococcus, in the shape of a slightly pointed cocci,gram positive,alpha-hemolytic,facultative anaerobic bacteria that are known to cause different types of diseases such as pneumonia,sinus infection,ear infection and meningitis. They are mostly spread through coughing,sneezing and close contact with the infected person.

The structure of s.pneumoniae is composed of a complex polysaccharide capsule that entirely coveres the cell and this plays an important role in its virulence.Its cell wall is made up of peptidoglycan, with teichoic acid attached to every third N-acetyl muramic acid, and it is about 6 layers thick.