Practice Pakistan questions with answers and explanations.
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'Alas!' expresses sudden emotion, especially sorrow or regret.
Such standalone emotional expressions are interjections.
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'Him' is the objective form required after the verb 'praised.'
Object pronouns receive the action of a verb.
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'Those' points out which books are meant and appears before the noun.
Demonstratives functioning before nouns are determiners.
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'Running' is an -ing form functioning as the subject of the sentence.
A verb form used as a noun is called a gerund.
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'Crying' directly modifies the noun 'baby.'
An -ing verb form used adjectivally is a present participle.
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Each term increases by 3.
Adding 3 to 12 gives 15.
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The word 'happily' describes how the children played.
A word that modifies a verb in this way functions as an adverb.
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Proteins are polymers of amino acids linked by peptide bonds.
Their sequence determines folding and function.
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Peptide bonds form through dehydration synthesis.
They link the carboxyl group of one amino acid to the amino group of another.
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Heat, pH, or chemicals can disrupt protein folding.
The amino-acid sequence may remain intact.
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Enzymes lower activation energy.
They speed reactions without being consumed overall.
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The active site has a shape and chemistry suited to its substrate.
Binding promotes the transition state.
