What are the differences between DNA replication on the leading and lagging strands and why do they exist?
What will be an ideal response?
The leading strand only requires primase to lay down one RNA primer while many RNA primers are needed on the lagging strand. DNA polymerase III is basically the only polymerase that is used on the leading strand to build DNA off of the one RNA primer, but the lagging strand also requires DNA polymerase I to replace the many RNA primers used. Ligase is also needed extensively on the lagging strand to glue the Okazaki fragments together after DNA polymerase I has done its job. Since the leading strand is one continuous read, Okazaki fragments are not found on this strand.
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Consider two islands located an equal distance from the mainland (colonization source). One island is large, the other is small. Which island will have a higher rate of change in species composition?
A. the small island B. the large island C. The rate of change in species composition will be the same on both islands. D. Species composition does not change at equilibrium.
Physical and chemical barriers that form the first line of innate defense include
A. the acidity of the stomach. B. tear fluid from the eye. C. an unpunctured skin. D. mucus and cilia of the respiratory tract. E. All of the answer choices are correct.
Which of the following is not one of the four main functions of the stem of a plant?
1.containing meristematic tissue that gives rise to new cells of the shoot 2.housing the vascular tissues 3.mechanical support 4.photosynthesis
A key discovery that weakened the Davson-Danielli "sandwich" model of cell membranes was that:a
membrane proteins form a solid sheet on either side of the phospholipid bilayer. b. membrane proteins form a solid sheet separating the phospholipid layer. c. the phospholipids do not associate with each other in the hydrophobic region of membranes. d. membrane proteins were not uniform and did not form flattened sheets. e. membrane proteins occurred in regular organized patterns on the surface of membranes.