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TLS Online TPP Program

#Question id: 11146

If you experimentally increase the concentration of Na+ outside a cell while maintaining other ion concentrations as they were, what would happen to the cell's membrane potential?

#Unit 7. System Physiology – Animal
  1. The membrane potential would become more negative.
  2. The membrane potential would become more positive.
  3. The membrane potential would be unaffected.
  4. The answer depends on the thermodynamic potential.
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TLS Online TPP Program

#Question id: 22972

#Unit 7. System Physiology – Animal

Parathyroid hormone stimulates calcitriol production in the kidney by increasing the synthesis of 
TLS Online TPP Program

#Question id: 34101

#Unit 3. Fundamental Processes

DNA polymerases fall into five families based on sequence Homologies; all have conserve
A. Finger domain
B. Thumb domain
C. Palm domain
D. Proofreading domain
TLS Online TPP Program

#Question id: 722

#Unit 1. Molecules and their Interaction Relevant to Biology

The structure of alpha helix is stabilized by hydrogen bonds between the hydrogen atom attached to the electronegative nitrogen atom of a peptide linkage and the electronegative carbonyl oxygen atom of the fourth amino acid on the amino-terminal side of that peptide bonds. Within the helix, every peptide bond (except those close to each end of the helix) participates in such hydrogen bonding. Each successive turn of the helix is held to adjacent turns by three to four hydrogen bonds, conferring significant stability on the overall structure. Which of the following are correct statements regarding these findings?

A. At the ends of a helical segment, there are always three or four amide carbonyl or amino groups that participate in this stabilised helical pattern of hydrogen bonding.

B. Helix ends are exposed to the surrounding solvent, where they hydrogen-bond with water, or other parts of the protein may cap the helix to provide the needed hydrogen-bonding partners.

C. Helix can form in polypeptides consisting of either L- or D-amino acids but a D-amino acid will disrupt a regular structure consisting of L-amino acids, and vice versa.

D. The most stable form of a helix consisting of L-amino acids is left-handed.

E. 310 helix occupies similar place as turns in Ramachandran plot due to its confirmation
TLS Online TPP Program

#Question id: 28975

#Unit 7. System Physiology – Animal

Aldosterone has three actions on the late distal tubule and collecting ducts of the kidney, except?
TLS Online TPP Program

#Question id: 5250

#Unit 8. Inheritance Biology

A researcher would like to map the location of galE and trpA genes in a new species of bacterium that appears to be closely related to E. coli. He decides to use cotransduction, and generatesnappropriate donor and recipient strains. He is disappointed when cotransduction is not seen in his experiement. What is the most reasonable explanation for this situation?