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Grille d'évaluation ( vidéo cell theory)

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Grille d'évaluation ( vidéo cell theory)

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Activity 1 : reminder ( made in 2nde)/Experiment : Last year, you observed different kind of living organisms under the microscope. WHAT DO YOU NOTICE ABOUT THEIR ORGANISATION ? 

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Activity 1 : reminder ( made in 2nde)/Experiment : Last year, you observed different kind of living organisms under the microscope. WHAT DO YOU NOTICE ABOUT THEIR ORGANISATION ? 

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observation of : Onion epidermis/Euglena/Elodea/Paramecia/Newt skin/yeasts

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On Quizlet

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Start studying Microscope. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

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Activity 1 : correction of your biology report

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Activity 1 : correction of your biology report

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BIOLOGY 10 - Basic Microscope Setup and Use

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How to prepare an onion epidermis slide

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Make an oral presentation about the cell theory ( you can use the quiz below to help you build your slideshow)

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Understanding the size scales relevant to cell biology

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Some cells are visible to the unaided eye

The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an amoeba proteus, a human egg, and a paramecium without using magnification. A magnifying glass can help you to see them more clearly, but they will still look tiny.

Smaller cells are easily visible under a light microscope. It's even possible to make out structures within the cell, such as the nucleus, mitochondria and chloroplasts. Light microscopes use a system of lenses to magnify an image. The power of a light microscope is limited by the wavelength of visible light, which is about 500 nm. The most powerful light microscopes can resolve bacteria but not viruses.

To see anything smaller than 500 nm, you will need an electron microscope. Electron microscopes shoot a high-voltage beam of electrons onto or through an object, which deflects and absorbs some of the electrons. Resolution is still limited by the wavelength of the electron beam, but this wavelength is much smaller than that of visible light. The most powerful electron microscopes can resolve molecules and even individual atoms.

Adenine

The label on the nucleotide is not quite accurate. Adenine refers to a portion of the molecule, the nitrogenous base. It would be more accurate to label the nucleotide deoxyadenosine monophosphate, as it includes the sugar deoxyribose and a phosphate group in addition to the nitrogenous base. However, the more familiar "adenine" label makes it easier for people to recognize it as one of the building blocks of DNA.

How can an X chromosome be nearly as big as the head of the sperm cell?

No, this isn't a mistake. First, there's less DNA in a sperm cell than there is in a non-reproductive cell such as a skin cell. Second, the DNA in a sperm cell is super-condensed and compacted into a highly dense form. Third, the head of a sperm cell is almost all nucleus. Most of the cytoplasm has been squeezed out in order to make the sperm an efficient torpedo-like swimming machine.

The X chromosome is shown here in a condensed state, as it would appear in a cell that's going through mitosis. It has also been duplicated, so there are actually two identical copies stuck together at their middles. A human sperm cell contains just one copy each of 23 chromosomes.

A chromosome is made up of genetic material (one long piece of DNA) wrapped around structural support proteins (histones). Histones organize the DNA and keep it from getting tangled, much like thread wrapped around a spool. But they also add a lot of bulk. In a sperm cell, a specialized set of tiny support proteins (protamines) pack the DNA down to about one-sixth the volume of a mitotic chromosome.

Carbon

The size of the carbon atom is based on its van der Waals radius.

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The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an amoeba proteus, a human egg, and a paramecium without using magnification. A magnifying glass can help you to see them more clearly, but they will still look tiny.

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Using the video, build a size scale on which you will place the different structures you can observe inside a cell

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Travel Deep Inside a Leaf - Annotated Version | California Academy of Sciences

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Introduction to Cells: The Grand Cell Tour

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for more information

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Biology: Cell Structure I Nucleus Medical Media

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The wacky history of cell theory - Lauren Royal-Woods

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History and development of cell theory (video) | Khan Academy

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all right so in order to describe cell theory I'm going to go ahead and tell you the story of how cell theory developed now over here on the right side of the screen you're going to notice a timeline that goes from the 1600s to the late 1800s and

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From the video ( after 3:33), build a labelled diagram of the cell membrane

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From the video ( after 3:33), build a labelled diagram of the cell membrane

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Quiz over the development of the cell theory focusing on scientists of the time such as Hooke, Virchow, Schleiden, and Schwann.

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study guide

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Join an activity with your class and find or create your own quizzes and flashcards.

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Cell structure

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Find quizzes on any topic and practice or compete with friends.

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Video made by the DNL team "bad doctors"

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Video made by the DNL team "bad doctors"

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Cells to systems test questions - KS3 Biology Revision - BBC Bitesize

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Study animal and plant cells with BBC Bitesize KS3 Science.

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Choose a specialized cell and give  an oral presentation to your classmates

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Build a model of a cell with candy and comment on it in a video that you will post for your classmates, with a quiz that they will have to answer, related to this video.