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TLS Online TPP Program

#Question id: 11494

How do aquaporins allow the passage of H2O but not H3O+?

#Unit 2. Cellular Organization
  1. aquaporin interrupts this process by forming covalent bonds from the side chain NH2 groups of two highly conserved Asn residues to a water molecule that is centrally located in the pore.
  2. aquaporin interrupts this process by forming hydrogen bonds from the side chain NH2 groups of two highly conserved Asp residues to a water molecule that is centrally located in the pore.
  3. aquaporin interrupts this process by forming hydrogen bonds from the side chain NH2 groups of two highly conserved Asn residues to a water molecule that is centrally located in the pore.
  4. aquaporin interrupts this process by forming hydrogen bonds from the side chain COO- groups of two highly conserved Asn residues to a water molecule that is centrally located in the pore.
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TLS Online TPP Program

#Question id: 14079

#Unit 1. Molecules and their Interaction Relevant to Biology

Which DNA is favored in many solutions that are relatively devoid of water with the base pair per turn of
A. B DNA
B. A DNA
C. Z DNA
D. 10 bp per turn
E. 11 bp per turn
F. 12 bp per turn
Which of the following combination is correct?
TLS Online TPP Program

#Question id: 13197

#Unit 1. Molecules and their Interaction Relevant to Biology

In helical nature of DNA is its periodicity each base pair is displaced (twisted) from the previous one by
TLS Online TPP Program

#Question id: 13196

#Unit 1. Molecules and their Interaction Relevant to Biology

 In The Mica Experiment Dnase I enzyme cleaves 
TLS Online TPP Program

#Question id: 13195

#Unit 1. Molecules and their Interaction Relevant to Biology

Who contributes to the stability of DNA helix structure?
A. Hydrogen bonding between bases
B. Hydrogen bonding between water and bases
C. Scattering interactions between bases
D. Stacking interactions between bases
CORRECT combination is
TLS Online TPP Program

#Question id: 13194

#Unit 1. Molecules and their Interaction Relevant to Biology

If we have the sequence 5’-ATGTC-3’ on one chain, the opposite chain must have the complementary sequence 
TLS Online TPP Program

#Question id: 13193

#Unit 1. Molecules and their Interaction Relevant to Biology

Data, collected from DNAs of a great many different species, led Chargaff to the following conclusions:
A. The base composition of DNA generally varies from one species to another.
B. DNA specimens isolated from different tissues of the same species have the different base composition.
C. The base composition of DNA in a given species changes with an organism’s age, nutritional state, or changing environment.
D. In all cellular DNAs, the sum of the purine residues equals the sum of the pyrimidine residues.
Which of the above statements are INCORRECT regarding Chargaff’s rule?