B3a Revision

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  • Created by: *Alisha*
  • Created on: 01-05-16 17:43
Explain why liver and muscle cells have large numbers of mitochondria:
As they carry out lots of energy demanding functions.
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What are ribosome's and where are they?
Ribosome's are where protein synthesis takes place and are located in the cytoplasm.
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Describe the structure of DNA:
DNA has two strands coiled to form a double helix, each strand contains chemicals called bases, of which there are four different types, with cross links between the strands formed by pairs of bases.
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What is a gene and what does it contain?
A gene is what controls certain characteristics in an organism. It contains a different sequence of bases and codes for a particular protein.
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Describe the four bases of DNA:
The four bases of DNA are A, T, C and G. They can be paired to form complementary base pairs. (A-T, C-G,)
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Explain why proteins are carried from DNA to the ribosome's by DNA by mRNA:
DNA cannot leave the nucleus so a copy is made called mRNA that is used to send the proteins to the ribosome's
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Describe how Watson and Crick used data from other scientists to build a model of DNA:
They used X-Ray data showing that there were two chains wound in a helix (Double Helix) and also used data indicating that the bases occurred in pairs.
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Why wouldn't new discoveries like Watson and Crick's not widely accepted?
As the structure of DNA has recently been discovered and so it is believed that other scientists should repeat the investigation.
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Other cards in this set

Card 2

Front

What are ribosome's and where are they?

Back

Ribosome's are where protein synthesis takes place and are located in the cytoplasm.

Card 3

Front

Describe the structure of DNA:

Back

Preview of the front of card 3

Card 4

Front

What is a gene and what does it contain?

Back

Preview of the front of card 4

Card 5

Front

Describe the four bases of DNA:

Back

Preview of the front of card 5
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