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Cell : The Unit of Life L-5 | Mitochondria and Plastids | Class 11 Biology | NEET 2023 | Biotonic



Cell : The Unit of Life L-5 | Mitochondria and Plastids | Class 11 Biology | NEET 2023 | Biotonic. Hey Students, Are you ready for the next lecture of Cell the unit of life on Mitochondria and Plastids..?? Mitochondria and Plastids Class 11 is the most important topic in Cell the unit of life Class 11. Check out the complete session of Cell the unit of life class 11 NEET – Mitochondria and Plastids along with menti quiz with some important questions NEET questions of Cell the unit of life class 11 NCERT by Vani Mam. Learn Mitochondria and Plastids Class 11 in Biotonic.

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46 thoughts on “Cell : The Unit of Life L-5 | Mitochondria and Plastids | Class 11 Biology | NEET 2023 | Biotonic
  1. 📢 Register for Vedantu Pro Subscription and get 10% Discount:

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  2. Todays hw.
    According to the Endosymbiotic theory,the eukaryotes were once prokaryotes.
    There were 2prokaryote which engulfed with mitochondria and chloroplast has 70S ribosomes and its own DNA.
    Hence they are finally called semi autonomous organelles.
    70 s ribosomes are usually present in prokaryotes and eukaryotes have 80 s ribosomes with some exceptions like mitochondria and chloroplast. … Mitochondria and Chloroplasts both have 70s Ribosome, since they are evolved from prokaryotic bacteria and developed a symbiotic relationship with the cell.

    thank u Ma'am …You have changed my learning pattern ❤❤😘😍 🤩😘😍

  3. *Mitochondrial contains it's own ribosomes-Mitochondria contain ribosomes(called mitoribosomes)and polyribosomes.
    *Sedimentation cofficient of ribosomes vary in different organisms. For example in Prokaryotic cell,70s ribosomes have been found, with subunit of 50s and 30s,in Eukaryotic cells mitoribosomes are larger and have a total sedimentation cofficient of 80s, with subunit of 60s and 40s. In mitochondria, ribosomes appear to be tightly associated with the inner membrane, therefore mitochondrial contains 70S ribosomes not 80S ribosomes.

  4. Today's homework :-
    ❤️ Endosymbiotic theory says that
    eukaryotic cells are come from
    Prokaryotic cells.
    It state that organelles such as
    mitochondria and chloroplast are
    once an aerobic bacteria that'swhy
    they have own circular DNA which
    are ingested by anaerobic bacteria.

    ❤️ Since from endosymbiotic theory
    we get to know that mitochondria and chloroplast are aerobic bacteria and bacteria have 70s ribosome. That's why mitochondria and chloroplast also have 70s ribosome.

    Thankyou mam for teaching us so well ❤️❤️❤️❤️

  5. Answer of todays question is :
    70 s ribosomes are usually present in prokaryotes and eukaryotes have 80 s ribosomes with some exceptions like mitochondria and chloroplast. These organelles have similar structures like possessing 70 s ribosomes,dna ,rna. This shows that mitochondria,chloroplast evolved from prokaryotic cell and this prokaryotic cell is present in a eukaryotic cell.

  6. TODAY'S HOMEWORK ,
    According to the endosymbiotic theory, the organelles which are semi- autonomous like mitochondria, were once present in prokaryotic cells. These cells were consumed by eukaryotes, here the mitochondria wasn't consumed. And after years of mutual development among the cells, the mitochondria is present only in eukaryotes which have 70s ribosomes, since the prokaryotic cells have 70s ribosomes too.

  7. Ma'am the session was wonderful 💜💜💜..I loved it .
    The hw answer is :-
    70s ribosomes are present in prokaryotic and 80s ribosomes are present in eukaryotic..but 70s ribosomes are also present in mitochondria and plastid because mitochondria are beleived to be evolved from prokaryotic cells which has 70s ribosome accompanied by some cells that were able to take oxygen in early earth.
    That is why mitochondria has 70s ribosome and can do cellular respiration and take oxygen.
    Thank you ma'am
    By :- Supriya

  8. HOMEWORK ANSWER
    According to ENDOSYMBIOTIC THEORY the organelles of EUKARYOTES like MITOCHONDRIA is the result of ENDOSYMBIOSIS of PROKARYOTIC ENDOSYMBIONTS and EUKARYOTIC HOST.

    So the CONCLUSION from this theory is that PROKARYOTES are ANCESTORS of MITOCHONDRIA thus they have same RIBOSOMES of 70s.

  9. WHY DO MITOCHONDRIA HAVE 70S RIBOSOMES?
    THE ANSWER TO THIS IS GIVEN BY THE ENDOSYMBIOTIC THEORY(symbiosis in which a symbiotic organism lives within the body of its partner), GIVEN BY LINN MARGULIS IN 1967:
    Life arose on earth around four billion years ago. The endosymbiotic theory states that some of the organelles in today's eukaryotic cells were once prokaryotic microbes. In this theory, the first eukaryotic cell was probably an anaerobic amoeba-like cell that got nutrients by phagocytosis and contained a nucleus that formed when a piece of the cytoplasmic membrane pinched off around the chromosomes. Some of these amoeba-like organisms ingested prokaryotic cells that then survived within the organism and developed a symbiotic relationship. Mitochondria formed when bacteria capable of aerobic respiration were ingested; chloroplasts formed when photosynthetic bacteria (cyanobacteria) were ingested. They eventually lost their cell wall and much of their DNA because they were not of benefit within the host cell (that is why they are semi autonomous organelles with their own DNA).

    The endosymbiotic theory, thus, states that some of the organelles in eukaryotic cells were once prokaryotic microbes. THE EVIDENCE FOR THIS THEORY:

    1)Mitochondria and chloroplasts are the same size as prokaryotic cells and divide by binary fission.

    2)Mitochondria and chloroplasts have their own DNA which is circular, LIKE PROKARYOTES.

    3)Mitochondria and chloroplasts have their own ribosomes which have 30S and 50S subunits (70S),LIKE PROKARYOTES, not 40S and 60S(80S) like eukaryotes.

    Hence, the conclusion is that MITOCHONDRIA (and chloroplasts) WERE ONCE SEPARATE PROKARYOTIC MICROBES!!!

  10. H.w answer—
    👉 The endosymbiotic theory states that some of the organelles in today's eukaryotic cells were once prokaryotic microbes.
    👉 In this theory, the first eukaryotic cell was probably an amoeba-like cell that got nutrients by phagocytosis and contained a nucleus that formed when a piece of the cytoplasmic membrane pinched off around the chromosomes.
    👉According to this theory, Mitochondria is formed when bacteria capable of aerobic respiration were ingested; chloroplasts is formed when photosynthetic bacteria were ingested. They eventually lost their cell wall and much of their DNA because they were not of benefit within the host cell.
    👉Where Mitochondria and chloroplasts have their own ribosomes that have 30S and 50S subunits, not 40S and 60S.
    👉Conclusions like – Mitochondria and chloroplasts are the same size as prokaryotic cells and divide by binary fission.
    👉Mitochondria and chloroplasts have their own DNA which is circular, not linear [ proves the significance of endosymbiotic theory.]

    And the session was amazing…..

  11. Yesterday's Homework
    According to endosymbiotic theory mitochondrial ribosome has 70S .
    70 s ribosomes are usually present in prokaryotes and eukaryotes have 80 s ribosomes with some exceptions like mitochondria and chloroplast. … Mitochondria and Chloroplasts both have 70s Ribosome, since they are evolved from prokaryotic bacteria and developed a symbiotic relationship with the cell.

  12. ENDOSYMBIOTIC THEORY :
    The endosymbiotic theory states that some of the organelles in today's eukaryotic cells were once prokaryotic microbes. In this theory, the first eukaryotic cell was probably an amoeba-like cell that got nutrients by phagocytosis and contained a nucleus that formed when a piece of the cytoplasmic membrane pinched off around the chromosomes.
    Some of these amoeba-like organisms ingested prokaryotic cells that then survived within the organism and developed a symbiotic relationship. Mitochondria formed when bacteria capable of aerobic respiration were ingested; chloroplasts formed when photosynthetic bacteria were ingested.
    Evidence for this is based on the following:

    1.Chloroplasts are the same size as prokaryotic cells, divide by binary fission, and, like bacteria, have Fts proteins at their division plane. The mitochondria are the same size as prokaryotic cells, divide by binary fission, and the mitochondria of some protists have Fts homologs at their division plane.

    2.Mitochondria and chloroplasts have their own DNA that is circular, not linear.

    3.Mitochondria and chloroplasts have their own ribosomes that have 30S and 50S subunits, not 40S and 60S.

    4.Several more primitive eukaryotic microbes, such as Giardia and Trichomonas have a nuclear membrane but no mitochondria.

  13. mam is there any other way of getting your class other than using the code because i have done the payment in other way and there was no option of putting code in it. mam please help if you have any solution😡. Mam really want to study with you.

  14. ma'am
    1. according to the endosymbiotic theory, the mitochondria was once associated with a bacteria(prokaryotes) for it's food
    2.On getting associated with the bacteria, the bacteria shall provide it food and mitochondria shall provide it energy synthesis .
    3. Such relationship, where two organisms are involved in a so as to satisfy theory mutual needs is called symbiosis.
    and this theory led the mitochondria evolved.
    Such theory is called the endosymbiotic theory.
    4. as an instance we see the ribosomes are of 70s types of mitochondria and not of 80s

    5. presented by Lynn Margulis in 1967

  15. Yesterdays home work by me:
    ■the mitochondria and chloroplasts are evolved from the prokaryotes .
    the mitochondria is evolved from prokaryotes and have single circular DNA. hence they have 70 s ribosomes
    ■ the endosymbiotic theory was proposed by the Lynn margulis in 1967.he said that the eukaryotes are evolved from the prokaryots(no nucleus).there were prokaryotic organisms who used different ways of nutritions such as heteotrophoc,saprotrophic,holozoic, etc.hence the eukaryotic organisms came in existence.
    ■the eukaryotes have 80s ribosomes and prokaryotes have 70s ribosomes.

  16. Homework Answer- Generally, eukaryotes have 80s ribosomes but mitochondria and chloroplasts are exceptions as they both have 70s ribosomes because they are evolved from prokaryotic bacteria and developed symbiotic relationship with the cell.

  17. Answer to the hw question is
    Mitochondria has 70s Ribosome coz it is a prokaryote and also first mitochondria was a free living organism then after it came with contact of our body and reside there so as to fulfill our and its demand … That's why its having 70s ribosome …And,also 80s is in eukaryotes …

  18. Mitochondria of the eukaryotes resemble the structure of a prokaryotic cell. As per the endosymbiotic theory, they were free-living bacteria once but got into the eukaryotic cell and lost most of their functions to the nucleus of the eukaryotic cell. Mitochondria have a double-stranded DNA which is not enclosed within the membrane. Their ribosomes are of 70s types, similar to those found in prokaryotes.

  19. Mitochondria of the eukaryotic resembles the structure of a prokaryotic cell.mitochondria have a double-stranded DNA which is not enclosed within the membrane ribosomes are of 70s types similar to those in prokaryotes that is why mitochondria have 70s

  20. Mam today's home work answer:-
    Because mitochondria were possibly once primitive bacterial cellthat were engulfed by eukaryotic cells. The "endosymbiosic theory" mitochondria have 70s ribosome just like prokaryotic cells and they also have their own DNA making this theory more valid. The theory assumes that a large host cell engulfed the primitive bacterial cell and then they both benefitted from each other so the mitochondria was replicated in future eukaryotic cell via division of the original host cell.

  21. Good evening mam. Mam there is a theory that you eukaryotes once engulfed the prokaryotes which contain 70 s. Since then , prokaryotes and eukaryotic cells live in a mutual or symbiotic relationship. This story is named as endo symbiotic theory.
    Also, 1 ) 70 s have evolved from the prokaryotes such as bacterial cells.
    2) this is an exception in eukaryotic cells as the eukaryotic cells majorly contain 80s

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