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TLS Online TPP Program

#Question id: 794

A single-stranded DNA molecule contains 40 nucleotides with equal amounts of A, C, G, and T. This DNA strand can combine with a complementary DNA strand to form a double-stranded DNA molecule. Which structural feature is found in the single-stranded DNA molecule?

#SCPH05 I Biotechnology

  1. It can have a negatively-charged backbone composed of nitrogenous bases.

  2. Each 3’,5’-phosphodiester bond will contain one phosphate group linking two deoxyribose sugars.

  3. It can have one end with a 5’-phosphate group while the other end has a 2’-hydroxyl group.

  4. Each purine and pyrimidine will be paired with a complementary base.

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TLS Online TPP Program

#Question id: 2922

#SCPH05 I Biotechnology

Human genes/proteins that regulate the cell cycle are most easily isolated by:
TLS Online TPP Program

#Question id: 12917

#SCPH28 | Zoology

Arrange the steps of stages in PCR in correct order.
1. The region to be specifically amplified is made accessible within the complex DNA.
2. The double stranded DNA is denatured by heating the reaction mixture to above 90 degree Celsius.
3. A thermal cycler is used to incrementally decrease the annealing temperature.
4. Reaction mixture is then cooled to a temperature between 40 and 60 degree celsius.
TLS Online TPP Program

#Question id: 4957

#SCPH28 | Zoology

How many half-lives should have elapsed if 6.25% of the parent isotope remains in a fossil at the time of analysis?
TLS Online TPP Program

#Question id: 19346

#SCPH28 | Zoology

Which one of the following measures changes in heat?
TLS Online TPP Program

#Question id: 17210

#I Life Science/ Life Sciences Group – I-V

which one of the following tools can reliably establish an evolutionary link between two proteins and align them even if they share very low degree of sequence similarity?