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TLS Online TPP Program

#Question id: 1462

In a healthy eukaryotic cell, the rate of DNA repair is typically equal to the rate of DNA mutation. When the rate of repair lags behind the rate of mutation, what is a possible fate of the cell?

#Unit 4. Cell Communication and Cell Signaling

  1. The cell can be transformed into a cancerous cell.

  2. RNA may be used instead of DNA as inheritance material.

  3. DNA replication will proceed more quickly.

  4. DNA replication will continue by a new mechanism.

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TLS Online TPP Program

#Question id: 31379

#Unit 5. Developmental Biology

The cadherin catenin complex is extremely important during compaction from a morula to the blastula. Transition of early embryonic cells into a blastula differed depending on the presence or absence of calcium ions. In addition, an investigator blocked the expression of β-catenin using vivo morpholinos to detect its effect simultaneously on compaction. Which one of the following conditions will lead to the most successful transition of the morula into the blastula?
TLS Online TPP Program

#Question id: 4094

#Unit 3. Fundamental Processes

The accompanying figure depicts the map of a part of E. coli genome harboring the lac operon.

 lac mRNA would hybridize to which of the following DNA?

1) lac I; 2) lac 0; 3) lac Z; 4) lac Y; 5) lac A
TLS Online TPP Program

#Question id: 5463

#Unit 8. Inheritance Biology

Plants with genotype aabb have seeds that average 1 g in weight, whereas plants with genotype AABB have seeds that average 3.4 g in weight. Plant with genotype aabb is crossed with plant of genotype AABB. If the F1 plants are intercrossed to produced 2/8 proportional of F2 plant having expected seed weight

A  . 1.6        B- 2.8        C-  2.2       D. 1             E . 3.4  
TLS Online TPP Program

#Question id: 4347

#Unit 3. Fundamental Processes

According to the lac operon model proposed by Jacob and Monod, what is predicted to occur if the operator is removed from the operon?
TLS Online TPP Program

#Question id: 28164

#Unit 13. Methods in Biology

It is possible to calculate the number of clones that must be present in a gene library to give a probability of obtaining a particular DNA sequence. This correct formula is: