Important Questions of Molecules and their Interaction relevant to Biology Life Sciences | Zigya

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91.

Helium and argon gases in two separate containers are at the same temperature and so have different root-mean-square (r.m.s) velocities. The two are mixed in a third container keeping the same temperature. The r.m.s velocity of the helium atoms in the mixture is

  • More than what it was before mixing

  • Less than what it was before mixing

  • Equal to what it was before mixing          

  • Equal to that of argon atoms in the mixture.


92.

The mineral tale is used in the manufacture of soap because it

a. Gives bulk to the product

b. Kills bacteria

c. Gives fragrance

d. Is soft and does not scratch the skin

Which of the above statements is/ are correct?

  • d

  • a and c

  • a and b

  • a and d


93.

100 gm of an inorganic compound X.5H2O containing a volatile impurity was kept in an oven at 150°C for 60 minutes. The weight of the residue after heating is 8 gm. The percentage of impurity in X was

  • 10

  • 8

  • 20

  • 80


94.

The spring balance in Fig. A reads 0.5 kg and the pan balance in Fig. B reads 3.0 kg. The iron-block suspended from the spring balance is partially immersed in the water in the beaker (Fig. C). The spring balance now reads 0.4 kg. The reading on the pan balance in Fig. C is

  • 3.0 kg

  • 2.9 kg

  • 3.1 kg

  • 3.5 kg


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95.

Phosphorylation of ADP to ATP occurs through energy metabolism, comprising oxidative phosphorylation or substrate-level phosphorylation or photo-phosphorylation (in plants). ATP can also be formed from ADP through the action of adenylate kinase. Crystal structure determination of adenylate kinase shows that the C-terminal region has the sequence

-Val-Asp-Asp-Val-Phe-Ser-Gln-Val-Cys-Thr-His-Leu-Asp-Thr-Leu-Lys

What can be a possible conformation of the sequence?

  • A helic that is not amphipathic

  • Amphipathic helix   

  • Leucine-zipper helix

  • Beta-hairpin


96.

Consider a 51-residue long protein containing only 100 bonds about which rotation can occur. Assume that 3 orientations per bond are possible. Based on these assumptions, how many conformations will be possible for this protein?

  • 3100   

  • 1003

  • 351

  • 51 × 100 × 3


97.

A plot of V/ [S] versus V is generated for an enzyme-catalyzed reaction, and a straight line is obtained. Indicate the information that can be obtained from the plot.

  • Vmax and turnover number Km can be obtained only from a plot of 1/ V versus 1/ [S].

  • Km/ Vmax from the slope                                                                             

  • Vmax, Km and turnover number.   

  • Only Km and turnover number.


98.

The following reactions are part of the citric acid cycle. The numbers in parenthesis indicate the number of carbon in each molecule:

Isocitrate(6) A α-ketoglutarate (5) a succinyl CoA (4) C succinate (4) D fumarate (4)

Which one of the following sequences of reaction systems A → D is correct?


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99.

Phosphoglucomutase is added to 0.1 M glucose-1-phosphate (G-6-P). The standard free energy change of the reaction, G-6-P double arrow G-1-P is 1.8 kcal/ mole at 25°C. The equilibrium concentration of G-6-P and G-1-P, respectively are:

  • 96 mM, 45 mM   

  • 100 mM, 0 mM

  • 45 mM, 96 mM

  • 0 mM, 100 mM


100.

Cystic fibrosis (CF) transmembrane conductance regulator (CFTR) protein is known to be a cAMP-dependent Cl- channel, CF patients (with mutant CFTR proteins) show reduced Cl- permeability and as a result, exhibit elevated Cl- level in sweat. To prove this, CFTR proteins (both wild type and mutant) are inserted in a model membrane (liposome), and Cl- transport is followed with radioactive Cl-. It is known that the topology of CFTR in the membrane is very important for its function. Despite no proteolytic degradation or denaturation of CFTR proteins, wild type CFTR failed to transport Cl- in liposome.

Which of the following is the correct explanation of this?

  • CFTR protein gets mutated during insertion in liposomes.

  • CFTR protein loses affinity with Cl- ions.

  • CFTR protein gets wrongly inserted in liposomes.   

  • CFTR protein loses channel forming property in liposomes.


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