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TLS Online TPP Program

#Question id: 12837

Haploid yeast cells were grown in culture and stained with propidium iodide, a fluorescent dye that is incorporated into DNA. The x axis shows DNA content, the y axis the number of cells. The DNA content analysis shows different populations of cells.

Which of the following statement is correct regarding to above graph?

#Unit 2. Cellular Organization
  1. Cells with unreplicated DNA (1C) and with replicated DNA (2C). The cells between the two peaks represent cells that are in the process of undergoing mitosis.
  2.  Cells with replicated DNA (1C) and with unreplicated DNA (2C). The cells between the two peaks represent cells that are in the process of undergoing DNA replication.
  3. Cells with unreplicated DNA (1C) and with replicated DNA (2C). The cells between the two peaks represent cells that are in the process of undergoing DNA replication.
  4.  Cells with unreplicated DNA (1C) and with replicated DNA (2C). The cells between the two peaks represent cells that are in the process of arrest in G1 phase.
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TLS Online TPP Program

#Question id: 27575

#Unit 1. Molecules and their Interaction Relevant to Biology

Which kind of interactions occur between the side chains of oppositely charged residues as well as between the NH3+ and COO− groups at the ends of polypeptide
TLS Online TPP Program

#Question id: 27573

#Unit 1. Molecules and their Interaction Relevant to Biology

Interaction type, Distance dependence of potential energy, and Typical energy (kJ mol-1) are given

Interaction typeDistance dependence of potential energyTypical energy (kJ mol⁻¹)
1. Ion-iona. 1/r6i. 2
2. Ion-dipoleb. 1/r6ii. 15
3. Dipole-dipole (rotating polar molecule)c. 1/r2iii. 0.3
4. London (dispersion)d. 1/riv. 250

Match them correctly
TLS Online TPP Program

#Question id: 27569

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is the most prominent type of interaction found between two molecule of water
TLS Online TPP Program

#Question id: 27080

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the correct statement about Vander-wall interaction  
1. Van der Waals potential (Evdw) is the sum of all interactions over all atoms
2. Van der Waals potential (Evdw)  is calculated by
3. This type of interaction is often called a 6–12 interaction, or the Leonard Jones potential.
4. Van der Waals forces are extremely weak, especially when compared with other forces influencing protein conformation
TLS Online TPP Program

#Question id: 27079

#Unit 1. Molecules and their Interaction Relevant to Biology

The van der Waals interaction as a function of interatomic distance r, then which of the following equation is correct 
TLS Online TPP Program

#Question id: 27077

#Unit 1. Molecules and their Interaction Relevant to Biology

The van der Waals interaction as a function of interatomic distance r (on x axis) which of the following graph is correctly representing the relation between attractive and repulsive region vs interatomic distance r