Cellulose is a polysaccharide (a Form of carbohydrate) made of many β linked D(dextrorotary)-glucose. Found primarily in plant cell walls and many algae cell walls. Non-cellulosic cell walls are not made of cellulose, e.g., Peptidoglycan cell walls in Bacteria which are made of proteins/amino acids (pep-) & carbohydrates/sugars (-glycan). 

1. Post MBBS you can prepare for NEET (or upcoming NEXT) Postgraduate entrance exam and do a PG in the subject of your choice to practice as a consultant in Hospitals or clinics.
2. With the MBBS degree, you can join through your State Medical Service exam in Government Medical Service as a Medical Officer in Primary Health Centers/ Community Health Centers / District Hospitals.
3. Post MBBS you can apply for Combined Medical Service Exam (CMS) of UPSC and join in central government medical services like CGHS or Railway Hospitals as a Medical Officer.
4. You can write the Insurance Medical Officer (IMO) exam of ESI Hospitals and join as Medical Officers in ESIC.
5. You can attend the walk-in Interview of ESI/JIPMER/AIIMS/ Private medical colleges to join as a Junior resident/ Tutor in the department available. (regular or contract basis)
6. You can participate as a duty doctor and work in ER/ ICU/ wards of Private nursing homes or hospitals
7. You can start your clinic and practice as a general practitioner. You can also do online courses or distance education or fellowship courses like Family medicine or Diabetology or geriatric medicine to strengthen your practice.
6. You can do AFIH course (3 months) in Industrial Health and join as Factory Medical Officer in Industries.
7. Yoy can join the Army through SSC as an Army Medical Officer.
8. Can do Aviation medicine and join Airforce Hospitals or Sports medicine and join as Doctor in sports teams.
9. can join ICMR/NIE like research organizations and continue as Research Scientist.
10. can join NGOs and participate in their outreach activities like health camps.
11. Can join WHO or UNICEF as a Consultant and serve as Surveillance Medical Officer (SMO) or Project Managers. Doing a Master in Public Health (MPH) after MBBS would be an added advantage.
12. can prepare for foreign medical licensing exams like USMLE (US) /PLAB (UK) /MCCQ (Canada) /Prometric exam (for gulf) etc. to practice in other countries.
13. you can also join as duty doctors in hospitals of Maldives, Seychelles etc. without entrance exams.
14. you can practice from home as an online Doctor through telemedicine apps like click2clinik/ letsdoc etc.
15. You can join as drug safety physicians in clinical trial research of Pharmaceutical industries.

Paying attention to your college classes is invaluable - especially if you have good teachers. Video lectures help you revise topics by seeing again and again. In my opinion, the video lectures by Mastermbbs.com are excellent. I found them very helpful to learn Anatomy, Physiology and Biochemistry.