Pakistan MCQs

Heat, pH, or chemicals can disrupt protein folding.
The amino-acid sequence may remain intact.

Enzymes lower activation energy.
They speed reactions without being consumed overall.

Phospholipids spontaneously form bilayers in water.
They are the main structural molecules of cell membranes.

Phospholipids spontaneously form bilayers in water.
They are the main structural molecules of cell membranes.

Phospholipids spontaneously form bilayers in water.
They are the main structural molecules of cell membranes.

Proteins are polymers of amino acids linked by peptide bonds.
Their sequence determines folding and function.

Proteins are polymers of amino acids linked by peptide bonds.
Their sequence determines folding and function.

'Since 2020' marks a starting point continuing to the present.
The present perfect is the standard tense for this duration.

The preparation was completed before the guests' arrival.
The past perfect shows this earlier completed past action.

The action will be in progress at a specified future time.
The future continuous tense expresses this situation.

The terms are factorials: 1!, 2!, 3!, and 4!.
The next term is 5! = 120.

Each term is obtained by doubling the previous term and adding 1.
Thus, 31 × 2 + 1 = 63.