TLS Online TPP Program

#Question id: 78


Which is true about naturally occurring monosaccharides?

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. The L-isomers predominate.

  2. The D-isomers predominate.

  3. The L and D-isomers occur in equal ratios.

  4. The ratio of L and D-isomers varies widely depending on the source.

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TLS Online TPP Program

#Question id: 13076

#Unit 13. Methods in Biology

Restriction fragment length polymorphism denotes that a single restriction enzyme produces fragments of different lengths from the same stretch of genomic DNA of different strains of a species or from different related species. RFLPs are detected as follows:

i.  Large molecular weight genomic DNA is isolated from several strains or related species;

ii.  The fragments in these digests are separated through electrophoresis

iii.  These 'DNAs are then digested with a selected restriction enzyme

iv.  Exposed to a suitably radio-labelled appropriate DNA probe under conditions favouring DNA: DNA hybridization

v.  The resulting gel lanes are transferred and fixed to a suitable solid support and

vi.   The free probes are removed

vii.  The fragments to which the probe has hybridized are detected by filming them as distinct bands on a suitable photofilm through autoradiography.

TLS Online TPP Program

#Question id: 18945

#Unit 13. Methods in Biology

PCR can be used to generate single-stranded copies of a DNA sequence; this is called

TLS Online TPP Program

#Question id: 28349

#Unit 5. Developmental Biology

After the organization of microtubules, the two mRNA bicoid and oskar complexed with microtubules motor protein in oocyte, which localizes these mRNA, select the correct prediction about oskar mRNA?

TLS Online TPP Program

#Question id: 1590

#Unit 4. Cell Communication and Cell Signaling

An epitope associates with which part of an antibody?

TLS Online TPP Program

#Question id: 29049

#Unit 10. Ecological Principles

Some given statements about anti freezing are given;
a. some invertebrates to withstand temperatures as low as –18°C without freezing, in presence of glycoproteins
b. Sodium, potassium, or chloride ions involve to increasing  the blood freezing point, so the lack of these ions some species help to lower the blood freezing point
c. Amphibians release large amount of glucose into the blood to prevent freezing of blood in cold
d. Sodium, potassium or urea function as anti freezing in their blood
e. Glycine causes supercooling in plants
Which of the following statements about supercooling/anti freezing is correct?