Biology B2/ DNA, CELLS, MICROSCOPY

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things in an animal cell?

(http://mcdaid-science.wikispaces.com/file/view/cell_pic_rigj'swrghpiu'aerhiuerh.gif/54377328/cell_pic_rigj'swrghpiu'aerhiuerh.gif)

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What is the Cytoplasm in a plant and animal cell?

Cytoplasm:

  • A gel like substance
  • Most chemical reactions happen here
  • Contains organelles (structures that carry out specific jobs)
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Things in a plant cell?

(http://www.bbc.co.uk/staticarchive/62c15b1c5544423cf2a9af13f5a913e4c237c3e1.jpg)and Mitochondria

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Difference between Animal Cell and Plant Cell?

(http://misstutor.com/wp-content/uploads/2010/11/Lesson-1-compare-plant-animal-cells.png)

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What are the three extra things in a plant cell, a

Cell wall:  

  • Strengthens the cell/gives support
  • Made of cellulose

Chloroplasts

  • Contain chlorophyll
  • photosynthesis occurs
  • absorbs light energy for photosynthesis

Large vacuole

  • Filled with cell sap
  • -weak solution of sugar and salts
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Role of Mitochondria in plant and animal cell?

Mitochondria

  • Most of the reactions for respiration take place here.
  • Respiration releases energy, cells need this to work
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Role of cell membrane in plant and animal cell?

Cell membrane

  • Holds cell together 
  • Controls what goes in and out
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Structure of a bacterial cell?

(http://www.bbc.co.uk/staticarchive/6002012ee89012f4f5b9079bdb29deadf2bd7ccd.jpg)

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What is Chromosomal DNA in a bacterial cell?

Chromosomal DNA:

  • Controls cell's activities and replication
  • floats free in the cytoplasm (not in the nucleus)
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what are plasmids in a bacterial cell?

Plasmids:

  • Small loops of extra DNA
  • aren't part of the chromosone
  • contain genes for things like drug resistance 

-can be passed between bacteria

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What is the role of the flagellum?

Flagellum:

  • Long hair-like structure
  • rotates to make the bacterium move
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How do you work out magnification?

Magnicfication= Length of image/ length of specimen 

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What is the structure of DNA?

DNA

  • Double helix: two strands coiled together
  • Paired bases
  • Chemicals=bases: hold the strands together
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What are paired bases?

There are 4 different bases that pair up:

Adenine and Thymine: AT

Cytosine and Guanine: CG

The base pairs are joined by weak hydrogen bonds

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What is a gene?

gene:

  • A section of DNA 
  • Sequence of bases in a gene code for a specific potein/ carries an instruction
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Function of each part of a microscope?

(http://www.scs.sk.ca/cyber/elem/learningcommunity/sciences/biology20/curr_content/biology20/Library/labeled_mscope3.gif)

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