The earliest Homo sapiens fossils are ca. 200,000 years old. Could you use radiocarbon dating to determine the age of fossils from that period? Briefly justify your answer in the space provided below
What will be an ideal response?
ANS:
No, the half-life of C14 is too short. After 200,000 years, too little C14 is left for a confident age estimate.
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How is initiation at oriC regulated in bacteria?
A. SeqA binds to hemimethylated DNA and sequesters the newly replicated origin. B. DnaA-ADP, formed when DnaA hydrolyzes its ATP, cannot maintain the destabilization of the origin so the closed complex reforms. C. The Hda protein binds the ? clamp causing DnaA to hydrolyze its ATP. D. RNA polymerase activity produces superhelical twisting that promotes melting of the origin by DnaA. E. All of these choices are correct.
What is formed during the light dependent reactions of photosynthesis?
a. H+ and H2O b. excited electrons and H+ c. ATP and O2 d. O2 and NADPH e. NADPH and ATP
Which of the following is not one of the major cell types of lymphoid tissue?
What will be an ideal response?
Comparing DNA or RNA samples from two different organisms to identify differences in gene expression is known as ________
A) RT-PCR B) differential display PCR C) DNA sequencing D) random PCR E) library screening