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TLS Online TPP Program

#Question id: 5295

A cross is made between an Hfr that is met+ thi+ pur+ and an F-that is met- thi- pur-. Interrupted mating studies show that met+ enters the recipient last, so met+ recombinants are selected on a medium containing supplements that satisfy only the pur and thi requirements.  These recombinants are tested for the presence of the thi+ and pur+ alleles. The following numbers of individuals are found for each genotype:

A) Gene Order

I

Thi Pur  Met

II

Pur  Met  Thi

III

Pur   Thi  Met

B) Distance between Pur and Thi

IV

15.4 map unit

V

1.8 map unit

What is the following correct combination?

#Unit 8. Inheritance Biology

  1. A- II, B-V        

  2. A-I, B-IV                

  3. A-1, B-V           

  4. A-III, B-V    

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TLS Online TPP Program

#Question id: 3738

#Unit 3. Fundamental Processes

Functions of DNA polymerases and accessory proteins in eukaryotic DNA replication include
TLS Online TPP Program

#Question id: 10616

#Unit 10. Ecological Principles

In a study of tree dispersion in a forest, we divided the forest into 1 sq km grid cells, choose 50 of them at random, and counted the number of trees in each cell. The means to variance ratio of the counts of trees per cell was much less than 1. What does this tell us about the spatial distribution of the trees?
TLS Online TPP Program

#Question id: 12254

#Unit 10. Ecological Principles

Assume that the abundance of a species in a community is proportional to the size of its niche. As each new species colonises this community, an existing niche is split. The resultant relative abundances of species in this community will be most uneven
TLS Online TPP Program

#Question id: 3623

#Unit 8. Inheritance Biology

To carry out a complementation test, which of the following statement is correct?
TLS Online TPP Program

#Question id: 140

#Unit 1. Molecules and their Interaction Relevant to Biology

A polypeptide chain may have abrupt changes in direction and restriction in geometry because of the presence of