Page 149 - Science Course 3 (Book 1)

Mo4-L3a: What is DNA?

Replication is the process of copying a DNA Transcription —the process of making RNA from
molecule to make another DNA molecule. DNA—is the first step in making a protein

1

2

1. DNA strand separates and nitrogen bases are
exposed.
Key Concept
2. Two Identical strands of DNA are produced.
What is DNA?

What is the role of RNA in Protein production?
Making Proteins
The DNA of each cell carries the complete set of
genes that provide instructions for making all the
proteins a cell requires.

Proteins are made with the help of ribonucleic acid
(RNA) —a type of nucleic acid that carries the code
for making proteins from the nucleus to the
cytoplasm.

Region of Region of completed
parental DNA replication.
helix
Region of replication:
New nucleotides are
pairing with those of
parental strands.

RNA:
• is made of nucleotides.
• is single-stranded.
• has the nitrogen base uracil (U) instead
of thymine (T), which is found in DNA.

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