Biomolecules MCQs for NEET — Chemistry Questions with Answers

The NCERT text explains: 'The reaction ultimately reaches a maximum velocity ($V_{ ext{max}}$) which is not exceeded by any further rise in concentration of the substrate. This is because the enzyme molecules are fewer than the substrate molecules and after saturation of these molecules, there are no free enzyme molecules to bind with the additional substrate molecules.'

According to the NCERT text: 'One such pocket is the ‘active site’. An active site of an enzyme is a crevice or pocket into which the substrate fits. Thus enzymes, through their active site, catalyse reactions at a high rate.'

The NCERT text states: 'Rates of physical and chemical processes are influenced by temperature among other factors. A general rule of thumb is that rate doubles or decreases by half for every 10°C change in either direction.'

The NCERT text defines it as: 'In these instances, the protein portion of the enzymes is called the apoenzyme.'

The NCERT text emphasizes: 'There is thus, an obligatory formation of an ‘ES’ complex. E stands for enzyme. This complex formation is a transient phenomenon.'

According to the NCERT text, 'In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton, giving rise to a dipolar ion known as zwitter ion. This is neutral but contains both positive and negative charges.'

The NCERT text states, 'Except glycine, all other naturally occurring $\alpha$-amino acids are optically active, since the $\alpha$-carbon atom is asymmetric.'

The NCERT text mentions, 'Most naturally occurring amino acids have L-configuration. L-Aminoacids are represented by writing the –NH2 group on left hand side.'

The NCERT text states, 'Chemically, peptide linkage is an amide formed between –COOH group and –NH2 group.'

According to the NCERT text, 'If a third amino acid combines to a dipeptide, the product is called a tripeptide. A tripeptide contains three amino acids linked by two peptide linkages.'