cell divison part 2

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    Cell Divison Part 3~1


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    cell divison part 1~1


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  • Cell Cycle


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  • Enzymes for IGCSE Biology


    A Reigate Grammar School Biology Department video. I hope it helps. Designed to go hand-in-hand with the department handout.

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  • Cell Division and the Cell Cycle


    This dramatic video choreographed to powerful music introduces the viewer/student to the wonder and miracle of the cell division and cell cycle. It is designed as a motivational trailer to be shown by Biology, Biochemistry and Life Science teachers in middle and high school and college as a visual Introduction to this miracle of life. As a high school Biology teacher myself, I have found this video to truly inspire my students to want to learn more about the topic.

    Please rate this video and feel free to comment. If you like it, please help me spread the word by posting links on your media websites. The more students who can enjoy these dramatic videos, the better!

    To view all of my videos in Biology, Earth Science, and Astronomy, subscribe to my channel at: I will be releasing new videos periodically.

    You can download all of my videos for free from Vimeo, my other video site. The link is available in the About section of this channel.

    I wish to thank all the quality video and music producers whose postings enabled me to assemble this video for educational use. To best enjoy this video, turn up your speakers. The music is very powerful and dramatic!

    The music is Pure Spirit of the Forest from the movie, Avatar.

    I can customize this video to add your name or school name at the end credits, for a very modest fee. If interested, email me at [email protected]

  • Algae:Chara lecture, BSc Botany by Dr. Ruby Singh Parmar, Biyani group of colleges


    This is a part of lecture presented by Dr. Ruby Singh Parmar,(Head Of The Department,Science),Biyani girls college. This video is about algae which belongs to family chara.This algae is commonly called as stone wort because it occurs in areas which are rich in limestone.In this video morphology anatomy and reproduction of chara discussed.

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    cell structure & function for AIPMT,WBJEE,AIIMS etc


    cell structure & function for AIPMT,WBJEE,AIIMS etc

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  • Nerve Impulse Transmission-Dr Sachin Kapur


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    All about Eukaryotic cell Hindi


    All about Eukaryotic Cell a video Lecture for Hindi medium students

  • Cell Cycle


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  • Nervous system 4, Nerve impulses


    We have already mentioned that a nerve impulse is electrical. This electrical charge is generated by the relative distribution of ions on both sides of the cell membrane. If there are more negative ions inside the cell with relatively more positive ions outside, the overall charge will also be negative on the inside and positive on the outside. This state is sometimes referred to as the resting potential. This is the electrical condition a nerve fibre will be in when there is no nerve impulse passing a particular point. Because in this situation there is a negative pole inside and a positive pole on the outside, the cell is described as being polarized. These are the same as the poles of a battery, one of which is negative and the other positive.
    However, when a nerve impulse is passing a point on a nerve fibre, the polarity across the cell membrane reverses. There is a change in the permeability of the membrane surrounding the nerve fibre. This allows ions to pass through the cell membrane leading to a change in the relative distribution of positive and negative ions on the two sides of the membrane. The result is the inside becomes positive and the outside negative. This reversal of polarity is referred to as depolarization. After the nerve impulse has passed, the polarity reverts back to being negative inside and positive outside. The process by which resting polarity is restored is termed repolarization. From this it can be seen that a nerve impulse is a wave of depolarisation which passes along a nerve fibre. It is this electrical wave which constitutes the nerve impulse. Changes in polarity necessary for the propagation of the impulse are brought about by changes in the relative distribution and concentration of ions. These concentrations may change because ions are able to pass through the cell membrane in specialised small gaps called ion channels.

  • photosynthesis part 1 00 00 00 00 20 00


  • B2.1.4 Lichens, Viruses & Viroids


    Have any doubts?
    Follow this link and ask from the experts. It’s free.
    Class 11 Biology – Biological Classification
    Since the dawn of civilisation, there have been many attempts to classify living organisms. The earliest scientific methods to classify organisms were that plants were classified as shrubs, trees, and herbs and animals were classified as red-blooded and non-red-blooded. But this classification was not enough. Then came a more detailed classification of Plantae and Animalia kingdom. Is this the perfect way of classification? How would we classify unicellular and multicellular organisms? There were a lot of organisms which didn’t fall into either category. So came the need of other classification method which we’ll discuss here. We’ll learn
    1. Kingdom Monera.
    2. Kingdom Protista and Kingdom Fungi.
    3. Kingdom Plantae and Kingdom Animalia.
    4. Lichens, Viruses and Viroid.

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  • demo lecture plant tissue for AIPMT,BHU,AIIMS,WBJEE other state PMT


    demo lecture plant tissue for AIPMT,BHU,AIIMS,WBJEE other state PMT

  • NEET Medical Online Video on Alcohols, Phenols & Ethers: Class 12th Chemistry


    This Aakash iTutor video talks about preparation of alcohol using Grignard reagent. The first reaction is gregnard reagent with carbonyll compounds, which are aldehydes and ketones and this reaction is nucleophilic addition. The product undergoes hydrolysis to form alcohol. The video further gives a few examples to support the above statement which gives us a primary alcohol. The thing to note is that formaldehyde forms primary alcohols while the rest form secondary aldehydes. If we take a ketone the final product would be tertiary alcohol.

  • Mendelian Genetics monohybrid cross & laws of mendel for AIPMT,AIIMS,WBJEE,BHU


    Mendelian Genetics monohybrid cross & laws of mendel for AIPMT,AIIMS,WBJEE,BHU

  • Cell Organelles - Animated Presentation



    - Usually in the form of chromatin
    - Contains genetic information
    - Composed of DNA
    - Thicken for cellular division
    - Set number per species (i.e. 23 pairs for human)
    Nuclear membrane

    - Surrounds nucleus
    - Composed of two layers
    - Numerous openings for nuclear traffic

    - Spherical shape
    - Visible when cell is not dividing
    - Contains RNA for protein manufacture


    Collective term for cytosol and organelles contained within
    Colloidal suspension
    Cytosol mainly composed of water with free-floating molecules
    Viscosity constantly changes


    rioles- Paired cylindrical organelles near nucleus
    - Composed of nine tubes, each with three tubules
    - Involved in cellular division
    - Lie at right angles to each other

    - A plastid usually found in plant cells
    - Contain green chlorophyll where photosynthesis takes place

    - Composed of microtubules
    - Supports cell and provides shape
    - Aids movement of materials in and out of cells
    Endoplasmic reticulum

    - Tubular network fused to nuclear membrane
    - Goes through cytoplasm onto cell membrane
    - Stores, separates, and serves as cell's transport system
    - Smooth type: lacks ribosomes
    - Rough type (pictured): ribosomes embedded in surface
    Golgi apparatus

    - Protein 'packaging plant'
    - A membrane structure found near nucleus
    - Composed of numerous layers forming a sac

    - Digestive 'plant' for proteins, lipids, and carbohydrates
    - Transports undigested material to cell membrane for removal
    - Vary in shape depending on process being carried out
    - Cell breaks down if lysosome explodes

    - Second largest organelle with unique genetic structure
    - Double-layered outer membrane with inner folds called cristae
    - Energy-producing chemical reactions take place on cristae
    - Controls level of water and other materials in cell
    - Recycles and decomposes proteins, fats, and carbohydrates, and forms urea

    - Each cell contains thousands
    - Miniature 'protein factories'
    - Composes 25% of cell's mass
    - Stationary type: embedded in rough endoplasmic reticulum
    - Mobile type: injects proteins directly into cytoplasm


    - Membrane-bound sacs for storage, digestion, and waste removal
    - Contains water solution
    - Contractile vacuoles for water removal (in unicellular organisms)


    Cell wall

    - Most commonly found in plant cells
    - Controls turgity
    - Extracellular structure surrounding plasma membrane
    - Primary cell wall: extremely elastic
    - Secondary cell wall: forms around primary cell wall after growth is complete
    Plasma membrane

    - Outer membrane of cell that controls cellular traffic
    - Contains proteins (left, gray) that span through the membrane and allow passage of materials
    - Proteins are surrounded by a phospholipid bi-layer.

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  • demo video lecture cell division


  • mitosis in hindi



  • videoanimal tissue demo lecture for AIPMT,BHU,WBJEE,AIIMS,CPMT,MPPMT,RPMT,etc


    animal tissue demo lecture for AIPMT,BHU,WBJEE,AIIMS,CPMT,MPPMT,RPMT,etc

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    Theories of evolution demo


  • NEET Medical Online Video on Chemical Bonding - Formal Charges: Class 11th Chemistry


    Each and every atom of a covalent molecule persists a certain charge. That is not an actual charge and it is known as a formal charge, and formal charge on an atom can be calculated using a formula. She further explains how to calculate the formal charge using the formula. The instructor gives various examples and explains the calculation process methodically.

  • Strategy for AIPMT - Part 1


    Hello guys. Welcome to online video lecture series by PMT Gurumantra.

    PMT Gurumantra is an online portal for students preparing for medical entrance examinations, launched by Dr. Rahul Chawla in 2011.

    The current video lecture covers five of the frequently asked doubts of students.

    It's our first video. So, there are a few glitches. I am trying to learn the art of making videos. Kindly forgive. Hope you like our initiative.

    Please share this video with your friends.

    We'll be uploading more videos quite soon. So, subscribe to our channel and stay tuned :)

    If you have any doubt, please log on to our website pmtgurumantra.in

    Happy Studying :)

  • Biology Cell Cycle & Cell Division part 2 CBSE class 11 XI


    Biology Cell Cycle & Cell Division part 2 (What is cell division, cell cycle) CBSE class 11 XI

  • a bacteria cell drawing


    a drawing of a bacteria cell

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    mycota /kigdom fungi /biological classification for AIPMT,CMPT,AIIMS


    mycota /kigdom fungi /biological classification for AIPMT,CMPT,AIIMS

  • terminology of plant taxonomy in hindi for bsc II sem part 5


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    Microbes in human health welfare for AIPMT,BHU,AIIMS,AIPMT,CPMT


    Microbes in human health welfare for AIPMT,BHU,AIIMS,AIPMT,CPMT

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    Microbiology - Bacteria


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  • digestive System demo lecture


  • Transcription and Translation


    Paul Andersen explains the central dogma of biology. He explains how genes in the DNA are converted to mRNA through the process of transcription. He then explains how ribosomes use this message to convert the mRNA to a functioning protein. He also shows you how to decode a gene by converting the DNA to complementary mRNA and then to the specific amino acids in a protein.

    Intro Music Atribution
    Title: I4dsong_loop_main.wav
    Artist: CosmicD
    Link to sound:
    Creative Commons Atribution License

  • trick to memorize hormone for aipmt BHU,AIIMS


    trick to memorize hormone for aipmt BHU,AIIMS

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    CELL CYCLE AND CELL DIVISION - 01 For Class 11th and AIPMT



    The cell cycle or cell-division cycle is the series of events that take place in a cell leading to its division and duplication of its DNA (DNA replication) to produce two daughter cells. In bacteria, which lack a cell nucleus, the cell cycle is divided into the B, C, and D periods. The B period extends from the end of cell division to the beginning of DNA replication. DNA replication occurs during the C period. The D period refers to the stage between the end of DNA replication and the splitting of the bacterial cell into two daughter cells. In cells with a nucleus, as in eukaryotes, the cell cycle is also divided into three periods: interphase, the mitotic (M) phase, and cytokinesis. During interphase, the cell grows, accumulating nutrients needed for mitosis, preparing it for cell division and duplicating its DNA. During the mitotic phase, the chromosomes separate. During the final stage, cytokinesis, the chromosomes and cytoplasm separate into two new daughter cells. To ensure the proper division of the cell, there are control mechanisms known as cell cycle checkpoints.

    The cell-division cycle is a vital process by which a single-celled fertilized egg develops into a mature organism, as well as the process by which hair, skin, blood cells, and some internal organs are renewed. After cell division, each of the daughter cells begin the interphase of a new cycle. Although the various stages of interphase are not usually morphologically distinguishable, each phase of the cell cycle has a distinct set of specialized biochemical processes that prepare the cell for initiation of cell divisions.

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  • NEET BIO - Kingdom fungi


    This video describes about general characteristics of kingdom fungi which constitute a unique kingdom of heterotrophs ( saprophytic or parasitic) moulds, mushrooms, toadstools, puffballs etc. yeast are unicellular, fungi are decomposers and mineralisers of biospheres.

  • Biological Classification by Dr. Shivani Bhargava


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    Locomotion Part 2 1


  • nervous system demo video lecture for AIPMT,BJEE,BHU,AFMC,AIIMS


    nervous system demo video lecture for AIPMT,BJEE,BHU,AFMC,AIIMS

  • Muscular & Nervous Tissue - NEET AIPMT AIIMS Zoology Video Lecture RAO IIT ACADEMY


    NEET AIPMT AIIMS Zoology Video Lectures and Study Material developed by highly experienced and dedicated faculty team of Rao IIT Academy. Visit or email [email protected] for any query or doubt related to your NEET AIPMT AIIMS Preparation.
    Want to be the Topper ??? Learn Muscular & Nervous Tissue
    from Rao IIT Academy. Prepare for your Boards and NEET AIPMT AIIMS and other Competitive Exams with Rao IIT Academy.


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    11th and 12th Boards (CBSE / ISC/ HSC / IB / IGCSE) in Integrated as well as Non-Integrated courses. It also offers Best Start-Smart Pre-foundation courses to Std. 6th, 7th, 8th, 9th & 10th students for preparation of Maths & Science Olympiads, NTSE, NSTSE, IISMA MTSE, Homi Bhabha, Ganit Prabhutva, CV Raman & IPM.

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    demo video lectures on enzymes for AIPMT,BHU,AIIMS,AFMC,WBJEE


    demo video lectures on enzymes for AIPMT,BHU,AIIMS,AFMC,WBJEE

  • Biology By rajnish sir





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    Human Reproduction Part 1~1


  • circulatory system part 1


  • transpiration in plant for AIPMT,WBJEE,BHU,AIIMS etc.


    transpiration in plant for AIPMT,WBJEE,BHU,AIIMS etc.

  • Adrenal Glands 1


  • human respiratory system part 2 for AIPMT,WBJEE,BHU,AIIMS,AMU,MPPMT,RPMT etc


  • water absorption in plant by Dr.s.jaiswal for AIPMT,WBJEE,BHU,AIIMS etc


    water absorption in plant by Dr.s.jaiswal for AIPMT,WBJEE,BHU,AIIMS etc

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