"Breaking the genetic code" has been referred to as one of the most significant scientific achievements in modern times. Describe (in outline or brief statement form) the procedures used to break the code
What will be an ideal response?
- use of polynucleotide phosphorylase for the production of synthetic mRNAs
- introduction of synthetic mRNAs into the cell-free protein-synthesizing system
- frameshift mutations in the rII region of T4 phage to show code is triplet and degenerate
- triplet binding assay to produce mRNA–tRNA-ribosome complex
- development of regular copolymers for use in the cell-free protein-synthesizing system
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Watson and Crick based their conclusion that DNA is a double helix mainly on experimental results and measurements from
A) Chargaff, Wilkins, and Franklin. B) Avery, MacLeod, and McCarty. C) Hershey and Chase. D) Charles Darwin.
In the process of molecular cloning, which of the following cuts DNA double strands so that they have sticky ends?
a. restriction enzyme b. recombinant protein c. plasmid d. codon
Sea urchins living in the rocky intertidal zone use the following method to overcome wave shock:
a. creating burrows in which they live. b. having a low profile. c. using spines to dissipate the energy of the wave. d. all of the above
In the neritic zone, a 10-milliliter sample of surface water can contain ____ of multicellular planktonic organisms
a. hundreds b. thousands c. millions d. billions e. trillions