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.
Answer: A
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Genetic exchange between 2 homologous chromosomes is called
A. synapsis. B. pleiotropy. C. crossing over. D. allelic exchange. E. independent assortment.
A gene that produces a protein that is important in more than one biochemical pathway, or other trait, is a ___ gene.
a. pleiotropic b. recessive c. codominant d. incomplete dominant e. dominant
Polyploidy may arise from the failure of chromosomes to separate during cell division or by the
fertilization of an egg by more than one sperm. _________________ Indicate whether the statement is true or false.
Which of the following would be considered analogous structures?
A. Which of the following would be considered analogous structures? B. the wings of a bird and the forelimbs of a reptile C. the pelvis of a human and the pelvis of a whale D. the wings of a fly and the wings of a sparrow E. the flipper of a dolphin and the arm of a human