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TLS Online TPP Program

#Question id: 4090

Tryptophan synthesis can be controlled by a process called attenuation in which the levels of tryptophan in the cell control translation by

#Unit 3. Fundamental Processes

  1. the binding of the RNA polymerase to the genome.

  2. the alteration of the repressor protein.

  3. the folding of mRNA into hairpin loops.

  4. genes rich in codons for tryptophan.

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TLS Online TPP Program

#Question id: 1538

#Unit 4. Cell Communication and Cell Signaling

Many aspects of the biology of stem cells, including maintenance of pluripotency, self-renewal, and differentiation, are controlled by the phenomenon of RNA interference involving a variety of small molecules of RNA.

Match the following miRNA (Column I) with their target gene (Column II).

Column I

Column II

a. Let-7 miRNA

i. Bcl-2

b. miR-16

ii. PTEN phosphatase

c. miR-125a and miR-125b

iii. Myc

d. miR-21

iv. LIN28

TLS Online TPP Program

#Question id: 3261

#Unit 11. Evolution and Behavior

A parent population (P) is change into daughter populations (Q) which grow in habitats. After 1000 generations, the equilibrium frequency distribution of of the daughter populations is shown in the figure below. For reference, the vertical line represents the mean of the parent population. Which type of natural selection?
TLS Online TPP Program

#Question id: 11619

#Unit 8. Inheritance Biology

If a cross between restricted and dusky  ducks  the only progeny will be form from this cross is restricted and mallard, so what will be the genotype of parents?
TLS Online TPP Program

#Question id: 20413

#Unit 3. Fundamental Processes

Positive selection such as Mutations conferring antibiotic resistance in bacteria or venom-resistance of pray is example of 
TLS Online TPP Program

#Question id: 3618

#Unit 8. Inheritance Biology

Holandric genes ar