NEET BIOLOGY

Previous
Next

CELL STRUCTURES AND FUNCTION

BIO MOLECULES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When you have a fever, the high temperatures can denature (break down) proteins, one of the major biomolecules. When the proteins are denatured, their structures can change. How would this change in structure directly affect the proteins? Choose the best answer.
A
The proteins will increase in strength.
B
The proteins’ functions will change.
C
The proteins will no longer work at all.
D
The proteins will work better.
Explanation: 

Detailed explanation-1: -Heat increases the kinetic energy and causes the molecules to vibrate more rapidly and violently. The accelerated vibration can disrupt the hydrogen bonds, hydrophobic interactions, as well as Van der Waals forces, causing the unfolding of protein’s 3D structure and even destroying the ?-helix and the ?-sheets.

Detailed explanation-2: -It is determined that the protein molecule expands slightly (0.4% per 100 K) with increasing temperature and that this expansion is linear. The expansion is due primarily to subtle repacking of the molecule, with exposed and mobile loop regions exhibiting the largest movements.

Detailed explanation-3: -As a result of denaturation, globules get unfolded and helixes get uncoiled. Secondary and tertiary structures of protein are destroyed, but the primary structures remain unaltered. It can be said that during denaturation, secondary and tertiary-structured proteins get converted into primary-structured proteins.

Detailed explanation-4: -Elevated temperatures, extremes in pH, and changes in chemical or physical environment can all lead to protein denaturation. In general, things that destabilize H-bonding and other forces that contribute to secondary and tertiary protein structure will promote protein denaturation.

There is 1 question to complete.
Previous
Next