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TLS Online TPP Program

#Question id: 9261

Which of the following statements about horizontal gene transfer is accurate?

#Unit 9. Diversity of Life Forms
  1. Horizontal gene transfer was quite common in the early stages of evolution of life on Earth.
  2. Horizontal gene transfer among organisms does not occur today.
  3. Horizontal gene transfer moves only genes that play a role in metabolism.
  4. Horizontal gene transfer occurs only among closely related organisms.
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TLS Online TPP Program

#Question id: 27093

#Unit 1. Molecules and their Interaction Relevant to Biology

Say a, b, c, d, e, f, g  are the amino acid forming αα motif / Coiled-coils then which of the condition must be followed to form perfect αα motif / Coiled-coil

(1) 'a' & 'd' are hydrophobic residues

(2) 'a' & 'd' are hydrophilic residues

(3) 'e' and 'g' are found to be charged amino acids

(4) 'e' and 'g' are found to be uncharged amino acids
TLS Online TPP Program

#Question id: 4517

#Unit 3. Fundamental Processes

Statement: When phosphorylated, CREB binds to CREs near certain genes and acts as a transcription factor, turning on the expression of these genes.

Explanation: I-Regulation can result from phosphorylation of Nuclear transcription factor

II- Activation of a protein kinase in the nucleus that phosphorylates specific DNA-binding proteins and thereby alters their ability to act as transcription factors.
TLS Online TPP Program

#Question id: 14482

#Unit 13. Methods in Biology

In a horse race the odds in favour of four horses H1, H2, H3, H4 are 1 : 3, 1 : 4, 1 : 5; 1 : 6 respectively not more than one wins at a time. Then the chance that one of them wins is
TLS Online TPP Program

#Question id: 16130

#Unit 13. Methods in Biology

You are studying regulation of the yeast enzyme glutamine synthetase (GS), which is encoded by the GLN1 gene. You have isolated two mutants, designated gln2– and gln3–, that give decreased GS activity. Mating of either gln2– or gln3– haploids to wild type produces heterozygous diploids that show normal amounts of GS expression. When you cross either a gln2– or gln3– haploid to a gln1– strain the resulting diploids show normal expression of GS.              
How many units of ß-galactiosidase would you expect to be expressed from deletion 1 in a gln2– mutant? 
TLS Online TPP Program

#Question id: 15262

#Unit 2. Cellular Organization

A media which makes easier to distinguish colonies of the desired organism from other colonies growing on the same plate.