In Seymour Benzer's studies, if he mixed two RII phage together (co-infection studies in K12 ) and the resulting phage always failed to lyse K12 ________
A) the two mutants were in different cistrons
B) the two mutants were in the same cistron
C) the two mutants complemented each other
D) the two mutants failed to infect bacteria
E) the two mutants represented mutations in both A and B
Answer: B
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Fill in the blank(s) with correct word
To find the nucleotide sequence of human chromosomes, chromosomes had to be digested into small fragments and then ________
A) centrifuged and electrophoresed B) fingerprinted C) cloned and sequenced D) restricted
Pseudoscience and nonscience differ in that
A. nonscience is not valuable and pseudoscience is valuable. B. pseudoscience deceives, misleads, or misinforms and this is not a primary characteristic of nonscience. C. nonscience forms hypotheses and pseudoscience does not. D. pseudoscience has led to major changes in intellectual thought and nonscience has not.
Identify the true statement about exotoxins.
A. They are structural proteins on the exterior surface of bacteria. B. They nonspecifically activate host complement and coagulation cascades. C. They bind to specific receptors on host cells. D. They promote bacterial adhesion