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Study
DNA
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DNA strands fold into paired packages called ...
chromosomes
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What is TRANSCRIPTION?
This is when the cell makes a copy of the DNA. (called RNA)
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What did Rosalind Franklin do?
She obtained a crystal of DNA molecules and analysed it using Xrays.
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What is Down's syndrom (trisomy 21) caused by?
An extra chromosome (in the 21st set)
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The base ADENINE can only pair with...
thymine
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What are the types of bases in a nucleotide?
adenine, thymine, cytosine and guanine.
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Who are James Watson and Francis Crick?
the scientist who came up with a double helix DNA model
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What does DNA stand for?
Deoxyribonucleic Acid
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What is TRANSLATION?
This is when the RNA is converted into a sequence of amino acids that makes up the protein.
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The base CYTOSINE can only pair with...
guanine
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What three things are nucleotides composed of?
a phosphate group, a sugar and a nitrogen base.
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What is RNA (mRNA)?
partial copies of DNA
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What's the function of RIBOSOMES?
they build protein, read DNA codes (3 letters at a time), stick amino acids together to form new chains
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An important property of DNA is that it can ___
replicate
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Where is DNA found in a cell?
In the NUCLEUS of every eukaryotic cell.
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What is DNA (how can we define it?)
an instruction manual for how to build life / a molecular blueprint for a living thing
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What are NUCLEOTIDES?
Information stored in DNA as a code made up of four types of molecules
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What is the structure of DNA filaments called?
a double helix structure
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Which chromosomes do males have in there cells? (XX or XY)
XY
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Nucleotides assemble in chains through a ____ backbone.
sugar-phosphate
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What determines the information to build and maintain an organism?
the order of the bases in nucleotides
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How many PAIRS of chromosomes do humans have?
23
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