In gene transfer procedures, why is it necessary to use processed mRNA molecules to make DNA to transfer to another organism?
What will be an ideal response?
This procedure is necessary only when the gene to be transferred comes from a eukaryote. Eukaryotic DNA contains introns as well as exons, and bacteria have no way of removing introns because their DNA has none. So introns must be removed, and processed mRNA molecules have already had that done.
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To convert a nucleoside into a nucleotide, what moiety must be added?
A. One or more pyrimidine bases B. One or more phosphate groups C. One or more double bonds D. One or more purine bases
Which situation(s) might warrant the removal of a histidine tag when purifying a recombinant protein?
A. Histidine residues inhibit protein folding, thereby decreasing the functionality of the protein. B. The expression vector used for inserting the gene of interest already contains histidine-encoding sequences. C. Histidine residues bind preferentially to nickel resins on the column during purification, and are not washed away. D. All of the choices are correct.
The type of exercise that creates new blood vessels and makes the heart pump more efficiently is ________
Fill in the blank(s) with correct word
Which of the following is true about both sperm and egg production?
A) Millions of mature gametes are produced daily. B) Initiation of meiosis is continuous after puberty. C) All resulting gametes are haploid. D) All cells that result from meiosis function as gametes. E) All resulting gametes are the same size.