• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Discuss the theory that living organisms are composed of cells. Recognize that skeletal muscle cells and fungal hyphae have multinucleate cytoplasm.

Extracts from this document...

Introduction

IB Biology SL III Ryan Martucci Topic: 1 - Cells Date: 9-25-02 Period: 4th Sub-topic: 1.1 Cell Theory 1.1.1 3 Discuss the theory that living organisms are composed of cells. Recognize that skeletal muscle cells and fungal hyphae have multinucleate cytoplasm. Cells are subunits of organisms, and organisms are the units of life. Some organisms, such as amoebas, consist of single cells, but others are multi- cellular aggregates of many specialized types of cells. The cell is the lowest level of structure capable of performing all the activities of life. All organisms are composed of cells, the basic units of structure and function. 1.1.2 1 State that a virus is a non-cellular structure consisting of DNA or RNA surrounded by a protein coat. A virus is a non-cellular structure consisting of DNA or RNA surrounded by a protein coat. ...read more.

Middle

The cell ultrastructure refers to a cell's anatomy as resolved by an electron microscope. 1.1.6 1 Define organelle. Organelles are subcellular structures that are too small to be resolved by the light microscope. 1.1.7 2 Compare the relative sizes of molecules, cell membrane thickness, viruses, bacteria organelles, and cells, using appropriate SI unites. Eukaryotic cell 10-100 Nucleus 10-20 Chloroplast 2-10 Topic: 1 - Cells Sub-topic: 1.1 - Cell Theory Page: 3 Mitochondria 0.5-5 Prokaryotic cell 1-5 HIV virus 100 nm Ribosome 25nm Cell membrane 7.5-8 nm thick DNA strand 2 nm in diameter Small molecules 1 nm H atom 0.1 nm Bacteria 5-.1 1.1.8 2 Calculate linear magnification of drawings. 1 meter= 1000 millimeters (mm) 1 mm= 1000 micrometers (um) 1 um= 1000 nanometers (nm) 1.1.9 3 Explain the importance of the surface to volume ration as a factor limiting cell size. ...read more.

Conclusion

1.1.10 1 State that unicellular organisms carry out all the functions of life. Unicellular organisms carry out all the functions of life. 1.1.11 3 Explain that all cells in multicellular organisms differentiate to carry out specialized functions by expressing some of their genes but not others. The cells of multicellular organisms must continually turn certain genes on and off in response to signals from their external and internal environments. Also, gene _expression must be controlled on a long-term basis for cellular differentiation. Highly specialized cells, such as those of muscle or nerve tissue, express only a tiny fraction of their genes. A typical human cell expresses only 3-5% of its genes at any given time. 1.1.12 1 Define tissue, organ, and organ systems. A Tissue is an integrated group of cells with a common structure and function. An organ is a specialized center of body function composed of several different types of tissues. An organ system is a specialized center of body function composed of several different types of organs. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Molecules & Cells section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Molecules & Cells essays

  1. Fertilisers, Discuss;

    Farmers nowadays tend to add fertiliser for the sake of producing a larger yield. Scientific studies have proven that nitrogen-containing fertilisers are being over-used at times where they are no longer needed. This usually leads to eutrophication of water ways.

  2. Four organelles or structures that all eukaryotic cells have in common.Introduction.The cell as it ...

    They include endergenic reaction and endergenic reactions. Endergenic reaction is characterized as having products with more stored energy in them than the reactants have. An example is photosynthesis. Energy is stored for later use. Exergenic reactions release stored energy to do work in the cell. An example is respiration.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work