One of the main obstacles to successful cloning of sheep apparently overcome by Wilmut et al. was:a
finding an adult nucleus that was likely to work.
b. synchronizing the cell cycles of the donor cell and the egg cell.
c. enucleating the donor cell.
d. the ability to culture cells in the laboratory.
e. recognizing that the nucleus from one sheep cell may contain different genetic information
than the nucleus of another cell from the same animal
B
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Why are single-stranded binding proteins necessary for DNA replication?
A. They provide the energy necessary to separate the two strands of DNA. B. They prevent the two parental strands from coming together again. C. They direct the primase where to lay down the primer. D. They direct where replication will start. E. None of the answer options are correct.
A substrate
a. fits into the active site of a specific enzyme. b. fits into the active site of another specific substrate. c. catalyzes a chemical reaction. d. is always a protein. e. lowers the energy of activation in a chemical reaction.
Cystitis is most often caused by
A) Escherichia coli. B) Leptospira interrogans. C) Candida albicans. D) Neisseria gonorrhoeae. E) Pseudomonas aeruginosa.
Which is incorrect about inducible operons?
Which is incorrect about inducible operons? A) Often encode enzymes for catabolic pathways B) Include the lac operon C) Are normally turned off D) Have genes turned off by a buildup of end product E) Are turned on by the substrate of the enzyme