Why does DNA synthesis only proceed in the 5? to 3? direction?
a. Because DNA polymerases can only add nucleotides to the 3? end of a polynucleotide
strand.
b. Because the 3? end of the polynucleotide molecule is more electronegative than the 5? end.
c. Because that is the direction in which the two strands of DNA unzip.
d. Because that is the only direction that the polymerase can be oriented.
e. Because the chromosomes are always aligned in the 5? to 3? direction in the nucleus.
A
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Genetic engineering
A. allows the use of bacteria as production factories for a number of molecules. B. relies on recombinant DNA technology. C. is dependent on RNA enzymes. D. relies completely on conjugation. E. allows the use of bacteria as production factories for a number of molecules AND relies on recombinant DNA technology.
What are the sporangia of the bread mold Rhizopus?
a) vegetative structures with no role in reproduction b) sexual structures that produce diploid spores c) sexual structures that produce haploid spores d) asexual structures that produce haploid spores e) asexual structures that produce diploid spores
Marfan syndrome in humans is caused by an abnormality of the connective tissue protein fibrillin
Patients are usually very tall and thin, with long spindly fingers, curvature of the spine, sometimes weakened arterial walls, and sometimes ocular problems, such as lens dislocation. Which of the following would you conclude about Marfan syndrome from this information? A) It is recessive. B) It is dominant. C) It is pleiotropic. D) It is epistatic.
What DNA sequence elements define a transcription unit and how do they relate to the RNA that is produced?
What will be an ideal response?