6 III
The following image models a part of the process of DNA replication, which is performed by
enzymes and occurs simultaneously on both the 'leading' and the 'lagging' strand of DNA.
MNA
Which component of DNA replication only occurs on the lagging strand of DNA and not on the
leading strand?
O A. The enzyme helicase unzips the DNA.
O B. DNA polymerase adds nucleotides to the primer.
OC. An enzyme called ligase binds fragments of DNA together.

List two modern organisms that have pentameral symmetry

The dna in a cell’s nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell. for example, consider these two proteins: phosphofructokinase (pfk) is an enzyme that functions in the cytoplasm during glycolysis. insulin, a protein that regulates blood sugar levels, is secreted from specialized pancreatic cells. assume that you can track the cellular locations of these two proteins from the time that translation is complete until the proteins reach their final destinations.for each protein, identify its targeting pathway: the sequence of cellular locations in which the protein is found from when translation is complete until it reaches its final (functional) destination. (note that if an organelle is listed in a pathway, the location implied is inside the organelle, not in the membrane that surrounds the organelle.)

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures