TLS Online TPP Program

#Question id: 23451


You are returning home from school. On the way, you find a sealed envelope in a street, fully addressed with unused stamps on it. You would:

#General Aptitude
  1. leave it there as it was and walk away.
  2. remove the stamps and destroy the envelope.
  3. open the envelope, find out who has dropped it by mistake, and send it to him if possible.
  4. post it at the nearest letter box
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TLS Online TPP Program

#Question id: 339

#Unit 1. Molecules and their Interaction Relevant to Biology

The edges of each base pair are exposed in the major and minor grooves, creating a pattern of hydrogen-bond donors and acceptors and of hydrophobic groups (allowing for Vander Waals interactions) that identifies the base pair. The edge of an C : G base pair displays the following chemical groups in the following order in the major groove:

TLS Online TPP Program

#Question id: 338

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the difference between covalent bonds and ionic bonds?

TLS Online TPP Program

#Question id: 337

#Unit 1. Molecules and their Interaction Relevant to Biology

Which statement below is true about the relative lifetime of a hydrogen bond, compared to the rate of water’s ionization to hydroxide ions and hydronium ions?

TLS Online TPP Program

#Question id: 336

#Unit 1. Molecules and their Interaction Relevant to Biology

Which would you expect to be most soluble in water?

TLS Online TPP Program

#Question id: 335

#Unit 1. Molecules and their Interaction Relevant to Biology

Suppose the major solutes in intact lysosomes are KCl (~0.1 M) and NaCl (~0.03 M). When isolating lysosomes, what concentration of sucrose is required in the extracting solution at room temperature (25 °C) to prevent swelling and lysis?

TLS Online TPP Program

#Question id: 334

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements about hydrogen bonding is not true?