Which enzyme joins the paired sticky ends of DNA fragments?
a. reverse transcriptase
b. restriction enzyme
c. DNA ligase
d. DNA polymerase
e. polynucleotide kinase
ANSWER: c
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Why isn't bacterial DNA digested by the restriction enzymes bacteria produce?
A) The sequence recognized and cleaved by a restriction enzyme is not found in the bacterial genome. B) Bacterial cells have high concentrations of ligase which immediately repairs the any sites that are cleaved. C) Methyl groups added to the bases of restriction enzyme recognition sites within the bacterial chromosome block cleavage. D) Bacterial DNA is modified with phosphate groups that prevent the function of restriction enzymes. E) Restriction enzymes are found in the cytoplasm and DNA is only in the nucleus.
The numerical value of the free energy change indicates how fast a reaction will reach equilibrium.
Answer the following statement true (T) or false (F)
Which sequences would likely have both a nucleosome-depleted region (NDR) and a poly A/T tract to attract transcriptional activators to a transcription start sequence?
A) chromatin modifiers B) enhancers C) open promoters D) closed promoters E) insulators
Each time a species goes extinct:
a. there are evolutionary consequences. b. part of the evolutionary history of life on Earth is lost. c. there are practical and immediate consequences for the world today. d. All of the above.