Explain how the discoveries by Rosalind Franklin helped Watson and Crick build an accurate model of DNA.
Franklin's image and measurements revealed DNA's double-helix structure, the location of the phosphate backbone and bases, and the dimensions of the helix. Watson and Crick used this information to build an accurate model of DNA.
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Explain the roles of mRNA and tRNA in protein synthesis.
mRNA is transcribed from DNA and carries the genetic instructions to the ribosome. The nucleotides in mRNA are read as codons that code for amino acids. tRNA matches its anticodons to the mRNA codons and brings the correct amino acids so they can be joined to make a protein.
Explain how the discoveries by Rosalind Franklin helped Watson and Crick build an accurate model of DNA.
Rosalind Franklin’s image showed that DNA consists of two strands twisted into a double helix, with a phosphate backbone on the outside and bases inside. Her measurements of the DNA’s diameter, the spacing between strands and bases, the helix angle, and the number of bases per coil helped Watson and Crick build an accurate model.
Explain the roles of mRNA and tRNA in protein synthesis.
mRNA is transcribed from DNA and carries codons that specify amino acids. tRNA matches its anticodons to the mRNA codons and delivers the corresponding amino acids so they can be assembled into a protein.
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