Which of the following is true of the analysis of DNA fragments using gel electrophoresis?
A. DNA has an overall negative charge and moves to the positive pole.
B. An electric current through the gel causes DNA fragments to migrate.
C. DNA fragments are stained to visualize them.
D. Larger DNA fragments move slowly and remain closer to the wells.
E. All of these choices are correct.
Answer: E
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The pulmonary vein carries blood that is rich in oxygen back to the heart. Is there anything unexpected about the name of this vein?
A. Veins usually carry blood that has been depleted of oxygen. B. There is nothing unexpected about the name of this vein. C. Pulmonary refers to veins that carry blood to the lungs. D. Veins usually carry blood away from the heart.
Normal and sickle-cell hemoglobin molecules differ
A) in the number of amino acids in each molecule. B) by a single DNA point mutation that leads to the substitution of one amino acid for another. C) in the number and orientation of the amino acid chains attached to the heme portion of each molecule. D) in the number of oxygen molecules that can be carried by each molecule. E) by the type of bone marrow that produces them.
The Hawthorne and apple maggot flies appear to have become reproductively isolated from each other largely becausethey:a
have different mating behaviors. b. mate at different times of the day. c. have adapted to two different hosts. d. occupy different parts of the habitat. e. do not share the same reproductive organs.
Why does the oxidation of organic compounds by molecular oxygen to produce CO2 and water release free energy?
A) The covalent bonds in organic molecules are higher energy bonds than those in water and carbon dioxide. B) Electrons are being moved from atoms that have a lower affinity for electrons (such as C) to atoms with a higher affinity for electrons (such as O). C) The oxidation of organic compounds can be used to make ATP. D) The electrons have a higher potential energy when associated with water and CO2 than they do in organic compounds. E) The covalent bond in O2 is unstable and easily broken by electrons from organic molecules.