When Kary Mullis developed his original PCR protocol, the repeated heating between cycles inactivated the DNA polymerase so it had to be added again after each cycle. How was this problem later remedied?

What will be an ideal response?


The DNA polymerase from Thermus aquaticus, a resident of hot springs, is stable and active at very high temperatures. This polymerase, known as Taq, is now routinely used in PCR.

Biology & Microbiology

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When placed into a hypertonic solution, a bacterial cell will:

A) take in more water than it releases. B) lyse. C) shrink. D) swell.

Biology & Microbiology

The nucleoli, found within the nucleus, are the sites of ____ synthesis

a. chromatin b. mRNA c. ribosomal subunit d. gene e. protein

Biology & Microbiology

What fat is the building block for cell membranes?

a. trans fatty acids b. sterols c. phospholipids d. triglycerides e. cholesterol

Biology & Microbiology

What was the dependent variable in the peacock butterfly experiments?

A. Changing predators B. Changing habitats C. Painting the wings D. Clipping the hindwings E. Getting eaten

Biology & Microbiology