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TLS Online TPP Program

#Question id: 2117

Which of the following statements correctly describes osmosis?

#Section 3: Genetics, Cellular and Molecular Biology

  1. Osmosis only takes place in red blood cells.

  2. Osmosis is an energy-demanding or "active" process.

  3. In osmosis, water moves across a membrane from areas of lower solute concentration to areas of higher solute concentration.

  4. In osmosis, solutes move across a membrane from areas of lower water concentration to areas of higher water concentration.

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TLS Online TPP Program

#Question id: 3266

#Section 3: Genetics, Cellular and Molecular Biology

One species mates at the season when daylight is increasing from 13 hours to 13 hours, 15 minutes; another species mates at the season when daylight is increasing from 14 hours to 14 hours, 15 minutes. The isolating mechanism is
TLS Online TPP Program

#Question id: 3682

#Section 3: Genetics, Cellular and Molecular Biology

A mutated strain of E. coli replicates DNA normally at 25°C, but replication stops immediately when the temperature is raised to 37°C. Which protein is likely to be non-functional at the higher temperature?
TLS Online TPP Program

#Question id: 120

#Section 2: General Biology

Non-steroidal anti-inflammatory drugs (NSAIDS) like aspirin and ibuprofen act by blocking production of:
TLS Online TPP Program

#Question id: 13055

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

Precision will be reduced, but yield will be increased
Optimisation of a PCR reaction is often a compromise between the competing demands for precision, efficiency and yield. Although the specific effects may vary, generally, increasing the annealing temperature will increase non-specific primer binding and reduce precision. Increasing the length of the elongation phase will reduce the proportion of incomplete newly-synthesised strands and therefore increase yield. In this case, the potential effect on efficiency is unclear. Increasing the elongation phase would increase the reaction time, but the time taken to ramp down to a lower annealing temperature would be reduced.
Which of the following will provide least specific amplification in qPCR?
TLS Online TPP Program

#Question id: 344

#Section 4: Fundamentals of Biological Engineering

The partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule. What is this attraction called?