The DNA-binding site for the lactose repressor was identified by:
A. causing cleavage and subsequent methylation at purine residues.
B. methylating and hence protecting the DNA.
C. comparing DNA sequences protected by wild-type and mutant repressors.
D noting the DNA sequences that were protected from methylation by the repressor.
E. reading the DNA sequence that was methylated by DMS after repressor binding.
D
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Single-celled or colonial protists that have a two-part silica shell and are often photosynthetic are called ________
a. diatoms b. flagellated protozoans c. amoebas d. green algae
The PCR technique doubles the amount of DNA in a sample in each cycle. If you started the PCR technique with two fragments of double-stranded DNA, calculate how many double-stranded DNA fragments you would you have after four cycles
A) 8 B) 16 C) 32 D) 64
What is the role of ATP synthase?
A. It uses ATP to make glucose. B. It uses a proton gradient to make ATP. C. It uses ATP to make a proton gradient. D. It synthesizes ATP directly from glucose.
The solvent, cohesive, and temperature stabilization properties of water are primarily due to its ____.
A. ability to promote hydrophilic interactions B. ionic bonds C. hydrogen bonds D. ability to promote hydrophobic interactions E. nonpolar nature