From the late 1950s to the mid-1960s, numerous experiments using in vitro cell-free systems provided information on the nature of the genetic code. Briefly outline significant experiments in the determination of the genetic code
What will be an ideal response?
Use of polynucleotide phosphorylase for the random assembly of nucleotides provided for the assembly of RNA homo- and random heteropolymers, which when placed in the cell-free protein-synthesizing system provided products (polypeptide chains) for analysis. The triplet binding assay along with the use of repeating copolymers was used to verify information provided earlier and to establish the ordered codon assignments.
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What do carbohydrates, lipids, and proteins have in common?
A) All are important enzymes that function within the cell. B) All are inorganic molecules. C) Covalent bonding holds these molecules together. D) Polymers of these organic molecules form monomers via dehydration synthesis reactions.
Which of the following is NOT a member of the globin superfamily?
a. ? globin b. ? globin c. myoglobin d. immunoglobulin e. leghemoglobin
Fossils always consists of mineralized bones or teeth
a. true b. false
The following are steps in using SSU rRNA molecules to develop phylogenetic trees. Place these steps in the correct order.1. Isolate DNA from cells of each organism being tested.2. Amplify the DNA of the SSU rRNA genes of each organism using polymerase chain reaction. 3. Determine the nucleotide sequence of the SSU rRNA genes of each organism.4. Align nucleotide sequences to compare.5. Count the number of nucleotide differences between each pair of sequences and calculate the evolutionary distance.6. Input data into computer and use appropriate software to construct a phylogenetic tree.
Fill in the blank(s) with the appropriate word(s).