Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 56731
TLS Online TPP Program

#Question id: 13143

The Norway rat (Rattus Norvegicus), a widespread pest, was controlled for about a decade by the anticoagulant warfarin. This chemical substance, placed in food pellets, is absorbed by the intestinal tract and inhibits the clotting of blood. After a population decline for about 10 years, rat populations increased and stabilized. In one European population, as illustrated in the graph below, the percentage of rats resistant to warfarin has remained fairly stable over a number of years.

Resistance to warfarin is governed by a dominant autosomal gene, R. More than 15 percent of the resistant animals are heterozygous at this locus (Rr). The table below indicates the response to warfarin and relative reproductive fitness of individuals that are homozygous or heterozygous for the dominant gene (R). The RR individuals have a 20-fold increase in vitamin K requirement over individuals.

Fitness is a measure of the reproductive success of a particular genotype. The highest fitness is 1.00.
In a population where warfarin is no longer applied, the expectation is that the

#Unit 10. Ecological Principles
  1. Dominant gene (R) will supplant the recessive gene (r) in the population
  2. Heterozygotes (Rr) will have a reproductive advantage over both homozygotes (RR and rr) 
  3. Frequency of the dominant gene (R) will decline
  4. Frequency of recessive individuals will gradually decline
More Questions
TLS Online TPP Program

#Question id: 12189

#Unit 2. Cellular Organization

Following statements are regarding to model for reassembly of the nuclear envelope during telophase. 
A. Extensions of the endoplasmic reticulum (ER) associate with each decondensing chromosome and then fuse with one another, forming a double membrane around the chromosome. 
B. Dephosphorylated nuclear pore subcomplexes reassemble into nuclear pores, forming individual mini-nuclei called karyomeres. 
C. The enclosed chromosome further decondenses, and subsequent fusion of the nuclear envelopes of all the karyomeres at each spindle pole forms a single nucleus containing a full set of chromosomes.
D. Phosphorylated nuclear pore subcomplexes reassemble into nuclear pores, forming individual mini-nuclei called karyomeres.
Which of the following is incorrect?
TLS Online TPP Program

#Question id: 27394

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following has smallest size
TLS Online TPP Program

#Question id: 26924

#Unit 10. Ecological Principles

Which of the following is an incorrect example of resource partitioning?
TLS Online TPP Program

#Question id: 24204

#Unit 4. Cell Communication and Cell Signaling

What is the difference between trans and cis interactions during cell-cell adhesion respectively?
TLS Online TPP Program

#Question id: 24186

#Unit 1. Molecules and their Interaction Relevant to Biology

In cities throughout the country, there is a new direction in local campaign coverage. Frequently in local elections, journalists are not giving voters enough information to understand the issues and evaluate the candidates. The local news media devotes too much time to scandal and not enough time to policy.

This paragraph best supports the statement that the local news media