Discussion
How bioavailability of recalcitrant hydrocarbons is increased through microbial interaction with smaller solubilized/pseudosolubilized hydrocarbon droplets ?
Answer: A
Bioavailability is increased by secretion of biosurfactants.
Hydrocarbons such as alkanes and polycyclic aromatics dissolve poorly in water, so microbes cannot take them up readily. Many degraders secrete biosurfactants, such as rhamnolipids, which emulsify the oil into fine droplets and draw hydrocarbon molecules into micelles (pseudosolubilisation). The cells can then take up the hydrocarbon from these small solubilized droplets.
Chemotaxis moves cells towards a substance but does not make it more available. Efflux pumps export toxic compounds out of the cell. An altered, more hydrophobic cell surface lets cells attach directly to large oil drops, a different mechanism from uptake through solubilized droplets.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development