Download fix my dna text

Directions
Use the envelopes filled with different
nucleotide bases to finish the DNA strand
correctly.
Structure of DNA
Each strand of DNA is made of chemicals called bases. There are
four different types of bases, shown as A, T, C and G. In DNA, two
strands coil together to form a double helix. There are chemical
cross-links between the two strands, formed by pairs of bases.
Genes and Proteins
Each gene in a molecule of DNA contains:


A different sequence of bases
Codes for a particular protein
Proteins are made in the cytoplasm of a cell, not in the nucleus. Genes cannot leave
the nucleus, so a copy of the gene is needed. This copy is able to leave the nucleus
to go into the cytoplasm so that proteins can be made by the cell.
Complementary Base Pairs
The four bases of DNA are Adenine, Thymine, Cytosine and Guanine. They always
pair up in a particular way, called complementary base pairing:


A–T
G–C
The DNA Base Code
Protein structure is determined by the DNA base code.
Proteins are made from lots of amino acids joined together. Each amino acid is
coded by the sequence (order) of three bases. For example, GGT codes are found in
glycine but TCA codes are found in serine, a different amino acid. The sequence of
bases determines the sequence of amino acids in a protein molecule.
DNA controls the functions of a cell by controlling its production of proteins. Some
of these proteins are enzymes.
Messenger RNA (mRNA)
Ribosomes are the site of protein synthesis. They are found in the cytoplasm but
DNA is found in the nucleus. The genetic code needed to make a particular protein
is carried from the DNA to the ribosomes by a molecule called mRNA. Making:
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
mRNA from DNA is called transcription
Proteins from mRNA is called translation