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 explain how the use of polynucleotide phosphorylase and the triplet binding assay were used to
decipher the genetic code and why the triplet binding assay was more precise.
What will be an ideal response?
Use of polynucleotide phosphorylase for the random assembly of nucleotides provided for the assembly of RNA homopolymers 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 were used to verify information provided earlier and to establish the ordered codon assignments.
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The equation (N/t)/N1 (where N denotes the size of a population and t represents time) is used to calculate:
A. a habitat's carrying capacity. B. the "available" percentage of a habitat's carrying capacity. C. a population's density. D. a population's intrinsic growth rate. E. Euler's number.
Which of the following are true about ecosystems? Check all that apply.
_____ They contain both living and nonliving components. _____ There is a transfer of energy through the system and some energy is lost as heat energy. _____ Nutrients repeatedly cycle through the ecosystem. _____ They represent the lowest level of biological organization. _____ The ultimate source of energy for most ecosystems is the sun.
Biogeochemical cycles that involve exchange between living organisms and atmospheric gases are called ________ cycles
Fill in the blank(s) with correct word
No matter how much water a human drinks, the kidneys are always regulating various aspects of the blood, including ________.IThe pH of the bloodIIThe plasma concentration of iron ionsIIIThe plasma concentration of sodium ionsIVThe plasma concentration of potassium ionsVThe temperature of the blood
A. I, II, III, and IV B. I, II, III, IV, and V C. I, II, and III D. I, III, IV, and V E. I, III, and IV