Describe a cell-free protein synthesizing system with which you could determine unambiguously which codons specify which amino acids
What will be an ideal response?
You could use a system with synthetic mRNAs that contain only one type of base and then observe which type of polypeptide is synthesized. The polypeptide should contain only one type of amino acid. For example, a poly(U) mRNA would contain only UUU triplets and would produce a polypeptide chain entirely of phenylalanine.
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In lateral growth, the _________ is the source of new xylem and phloem, whereas the _________ renews and maintains the outer layer that protects the stem
A. cork cambium; vascular cambium B. vascular cambium; cork cambium C. secondary vascular tissue; primary vascular tissue D. sapwood; heartwood E. apical meristem; lateral meristem
All living things can be placed within three large categories: consumers, decomposers, or ________
a. prokaryotes b. producers c. animals d. eukaryotes
Identify two changes that occur at or shortly after birth that allow the neonate to live independently. What will be an ideal response?
What is typically the result of double fertilization in angiosperms?
A) The endosperm develops into a diploid nutrient tissue. B) A triploid zygote is formed. C) Both a diploid embryo and triploid endosperm are formed. D) Two embryos develop in every seed.