TLS Online TPP Program

#Question id: 3913


The sigma-70 subunit

#Section 3: Genetics, Cellular and Molecular Biology
  1. increases the affinity of the core polymerase for nonpromoter sequences.

  2. decreases the affinity of the core polymerase for specific promoter sequences.

  3. is responsible for transcribing many genes.

  4. is associated with a holoenzyme, enabling the formation of more stable complexes.

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TLS Online TPP Program

#Question id: 1303

#Section 3: Genetics, Cellular and Molecular Biology

What is a primary function of integrins?

TLS Online TPP Program

#Question id: 1432

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following proteins involved in angiogenesis is paired correctly with its function?

TLS Online TPP Program

#Question id: 10798

#Section 6: Plant, Animal and Microbial Biotechnology

Two other major groups of flavonoids found in flowers and leaves of all green plants. The function of these two flavonoids in plants are____

a) protect plants against being eaten by herbivores and against being infected by microbial pathogens

b) Protect cells from excessive UV-B radiation (280–320 nm) because they accumulate in the epidermal layers of leaves and stems and absorb light strongly in the UV-B region       

c) flavones and flavonols secreted into the soil by legume roots mediate the interaction of legumes and nitrogen-fixing symbionts

d) They are are coloured terpenoid compounds that also serve as accessory pigments in photosynthesis    

Which of the following combination from the above statements is correct?

TLS Online TPP Program

#Question id: 12924

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

In order to quantify unknown DNA templates, a standard dilution is prepared using DNA of known concentration. As the DNA accumulates during the early exponential phase of the reaction,an arbitrary point is taken where each of the diluted DNA samples cross. This is termed as_____

TLS Online TPP Program

#Question id: 351

#Section 2: General Biology

 If the cytoplasm of a cell is at pH 7, and the mitochondrial matrix is at pH 8, then the concentration of H+ ions ________.