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TLS Online TPP Program

#Question id: 7120

Which of the following is the only true statement regarding compaction in the mouse embryo?

#Unit 5. Developmental Biology
  1. Compaction involves the activation of cadherins, resulting in an increase in cell-cell adhesion among the 8 cells of the embryo.
  2. Compaction involves a polarization of the cells of the embryo, such that ions can be pumped from the outer surface of the embryo into the central cavity, resulting in an influx of water into the central cavity and formation of the blastocoel.
  3. Compaction gives subsequent cell divisions an orientation, such that cell divisions that occur tangential (parallel) to the cell surface will result in one cell being inside the embryo, where it can contribute to the inner cell mass.
  4. All of the above are true of compaction in the mouse embryo.
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TLS Online TPP Program

#Question id: 3835

#Unit 3. Fundamental Processes

State whether the following statements is true/false regarding DNA replication.

1. A short primer is added to the DNA polymerase reaction mix for Sanger DNA sequencing that has a 5สน free hydroxyl to which new nucleotides can be added.

2. In a sequencing gel, all fragment in one of the four lanes terminates in the same type of nucleotide base.

3. Eukaryotic cells contain at least five DNA polymerases all of which are responsible for nuclear DNA replication.

4. Since the rate of form movement in eukaryotes is much slower than that of bacteria, chromosomes require more than an hour to replicate.

5. Although histones and DNA are made in the same parts of the eukaryotic cell, the packaging of them in the nucleosome slows down replication so that it is slower than that of prokaryotes.
TLS Online TPP Program

#Question id: 3836

#Unit 3. Fundamental Processes

Which of the following statements accurately describes the differences between DNA replication in prokaryotes and DNA replication in eukaryotes?
TLS Online TPP Program

#Question id: 3837

#Unit 3. Fundamental Processes

How does the enzyme telomerase meet the challenge of replicating the ends of linear chromosomes?
TLS Online TPP Program

#Question id: 3838

#Unit 3. Fundamental Processes

Which of the following statements correctly describes the difference between the leading and the lagging strands of DNA during DNA replication?
TLS Online TPP Program

#Question id: 3839

#Unit 3. Fundamental Processes

Use the figure to answer the following question. In the late 1950s, Meselson and Stahl grew bacteria in a medium containing "heavy" (radioactive) nitrogen (15N) and then transferred them to a medium containing 14N (nonradioactive). Which of the results in the figure would be expected after one round of DNA replication in the presence of 14N?
TLS Online TPP Program

#Question id: 3840

#Unit 3. Fundamental Processes

The mechanism of DNA replication is studied in an E. coli replication fork. When will this fork stop replicating DNA?