NEET BIOLOGY

BIOLOGICAL CLASSIFICATION

KINGDOM MONERA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Gram-negative bacteria are more dangerous when they cause disease than gram-positive bacteria, because ____
A
Gram-negative bacteria can produce endotoxins, and have enzymes in the capsule that can cause resistance to antibiotics.
B
Gram positive bacteria have a waxy coating and mycolic fatty acids
C
Gram negative bacteria reproduce by binary fission, sometimes by budding
D
Gram positive bacteria are more resistant to physical disturbance
E
Gram negative bacteria are not resistant to acids
Explanation: 

Detailed explanation-1: -Their peptidoglycan layer is much thinner than that of gram-positive bacilli. Gram-negative bacteria are harder to kill because of their harder cell wall. When their cell wall is disturbed, gram-negative bacteria release endotoxins that can make your symptoms worse.

Detailed explanation-2: -Gram-positive bacteria cause tremendous problems and are the focus of many eradication efforts, but meanwhile, Gram-negative bacteria have been developing dangerous resistance and are therefore classified by the CDC as a more serious threat.

Detailed explanation-3: -In Gram-positive bacteria, the major bacterial lipid component, phosphatidylglycerol can be chemically modified by bacterial enzymes to convert the lipid from anionic to cationic or zwitterionic form. This process leads to increased levels of resistance of the bacteria against polycationic antimicrobial agents.

Detailed explanation-4: -Gram-negative bacterial infections are tough to treat because the microbes have an extra outer membrane that is hard for antibiotics to traverse. And the ones that do get in are usually pumped right back out by the cells.

There is 1 question to complete.