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DNA-The Double Helix. Answer Key. 1.  Write out the full name for DNA. D eoxyribo N ucleic A cid. 2.  What is a gene?. A gene is a segment of DNA that codes for a particular protein which in turn codes for a trait. 3.  Where in the cell are chromosomes located?.

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Presentation Transcript
2 what is a gene
2.  What is a gene?
  • A gene is a segment of DNA that codes for a particular protein which in turn codes for a trait.
3 where in the cell are chromosomes located
3.  Where in the cell are chromosomes located?
  • Chromosomes are found in the nucleus.
4 dna can be found in what two organelles
4.  DNA can be found in what two organelles?
  • DNA is found in the mitochrondria and chloroplasts.
5 what two scientists established the structure of dna
5.  What two scientists established the structure of DNA?
  • In 1953, James Watson and Francis Crick established the structure of DNA.
6 what is the shape of dna
6.  What is the shape of DNA?
  • The shape of DNA is a double helix, which is like a twisted ladder.
7 what are the sides of the dna ladder made of
7. What are the sides of the DNA ladder made of?
  • The sides of the ladder are made of alternating sugar and phosphate molecules.  The sugar is deoxyribose.
8 what are the rungs of the dna ladder made of
8.  What are the "rungs" of the DNA ladder made of?
  • The rungs of the ladder are pairs of 4 types of nitrogen bases. The bases are known by their coded letters A, G, T, C.  
9 what sugar is found in dna in rna
9.  What sugar is found in DNA? In RNA?
  • The sugar in DNA is deoxyribose.
  • The sugar in RNA is ribose.
10 how do the bases bond together
10.  How do the bases bond together?  
  • Adenine  bonds with Thymine.
  • Guanine bonds with Cytosine.
13 why is rna necessary to act as a messenger why can t the code be taken directly from the dna
13.  Why is RNA necessary to act as a messenger?  Why can't the code be taken directly from the DNA?
  • DNA is too big to go through the nuclear pores.  The messenger RNA (mRNA) is small enough to go through the nuclear pores.
14 proteins are made where in the cell
14.  Proteins are made where in the cell?
  • Proteins are made by the ribosomes.
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15. How do some cells become brain cells and others become skin cells, when the DNA in ALL the cells is exactly the same.  In other words, if the instructions are exactly the same, how does one cell become a brain cell and another a skin cell?

  • A cell has the ability to turn off most genes and only work with the genes necessary to do a job. 
16 why is dna called the blueprint of life
16.  Why is DNA called the "Blueprint of Life"?
  • Like the blueprints of a house tell the builders how to construct a house, the DNA "blueprint" tells the cell how to build the organism.