Practice Questions

TLS Online TPP Program

#Question id: 4968

Which of these observations fails to support the endosymbiotic theory for the origin of eukaryotic cells?

#XL - S Microbiology

the existence of structural and molecular differences between the plasma membranes of prokaryotes and the internal membranes of mitochondria and chloroplasts
the existence of size differences between the cytosolic ribosomes of eukaryotes and the ribosomes within mitochondria and chloroplasts
the existence of size differences between some prokaryotic cells and mitochondria
the existence of rRNA sequence differences between the cytosolic ribosomes of eukaryotes and the ribosomes within mitochondria and chloroplasts

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TLS Online TPP Program

#Question id: 20100

#XL - P Chemistry

Ice — Water mass ratio is maintained as 1 : 1 in a given system containing water in equilibrium with ice at constant pressure. If CP (ice) = CP (water) = 4.18 J mol^-1 K^-1molar heat capacity of such a system is

TLS Online TPP Program

#Question id: 20101

#XL - P Chemistry

During winters, moisture condenses in the form of dew and can be seen on plant leaves and grass. The entropy of the system in such cases decreases as liquids possess lesser disorder as compared to gases. With reference to the second law, which statement is correct, for the above process?

TLS Online TPP Program

#Question id: 20102

#XL - P Chemistry

The enthalpy change for a given reaction at 298 K is – x J mol^–1 (x being positive). If the reaction occurs spontaneously at 298 K, the entropy change at that temperature

TLS Online TPP Program

#Question id: 20103

#XL - P Chemistry

Spontaneous adsorption of a gas on a solid surface is exothermic process because