What is the purpose of DNA ligase in a cloning experiment?
A. The purpose is to proofread the vector for mistakes.
B. The purpose is to reestablish the stable sugar-phosphate backbone of the DNA molecule
C. The purpose is to allow the vector to enter into the cell.
D. The purpose is to function as a selectable marker.
B
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Which animal has the least advanced nerve cord?
a. chordate b. arthropod c. flatworm d. human e. octopus
A red chemical dye known as phenol red changes to yellow when CO2 is present. A small green plant seedling is placed in phenol red and then placed in the dark. Which of the following is most likely to occur?
a. The solution is yellow to begin with, and it will turn red because photosynthesis is occurring. b. The solution is red to begin with, and it will turn yellow because photosynthesis is occurring. c. The solution is yellow to begin with, and it will turn red because respiration is occurring. d. The solution is red to begin with, and it will turn yellow because respiration is occurring. e. The solution is red to begin with, and it stays red as photosynthesis cannot occur in the dark.
A mutation that leads to the buildup of homogentisic acid causes ____________________. Fill in the blank(s) with the appropriate word(s)
The interaction between allolactose and the repressor protein results in a shape change known as a(n)
A) isomer. B) mutation. C) enantiomer. D) allosteric shift. E) transformant.