Generally the proteins of thermophiles?

Question

A- resist denaturation.
B- react more efficiently with DNA.
C- are easily denatured.
D- have a particular amino acid sequence that restricts bond formation.
E- c and d

Answer 1

Sounds like it must be A.

Answer 2

A

Thermo = heat; phile = love; so thermophiles live in hot environments. Typically, these are archaea, since they are extremophiles; they live in places like deep sea hydrothermal vents and springs at Yellowstone.
Proteins are denatured at high heat because the temp gives them higher kinetic energy (temp is actually a measure of KE). This means that their bonds have more conformations available to them. At any given point, not all proteins of a specific type are the correct shape for catalysis, since they seesaw back and forth between shapes. However, at extremely high temps, enough of them are in incorrect shapes that each type of proteins is effectively denatured.

B: wrong; proteins react about as efficiently among temps in which the organism evolved. That is, the proteins in humans are as efficient at room temp as are the proteins of some archaea at extreme temps. Switch the temps of these proteins, however, and none will function well.
C: wrong (the opposite of A).
D: why would proteins restrict bond formation? That would mean they're non-functional.

Answer 3

A, resists denaturation, enzymes are proteins and the proteins of the thermophiles are heat-stable.

Answer 4

A. resist denaturation

because they reside in high temperature environments, their proteins are also able to survive in such environments.
heat generally denatures protein, but obviously an organism from a high temperature environment would have proteins that would be able to function (and not easily be denatured) in those conditions.