CAIE A-Level Biology AS 2 Biological Molecules Topic Practice

Many flowers produce a sweet solution called nectar. Bees provided with nectar use enzyme Q to change the nectar into honey.

After testing a sample of nectar for the presence of reducing sugar using standard laboratory reagents, the sample was blue. After testing a sample of honey in the same way, the sample was orange.

Which conclusion about the reaction catalysed by enzyme Q is consistent with these results?

Which structure shows $\alpha$-glucose?

Which statements about peptide bond formation are correct?
1 The bond formation occurs between a carbon of one amino acid and a nitrogen of the next amino acid after the amino acids detach from tRNA.

2 The bond formation occurs at the ribosome while the amino acids are still attached to tRNA, and is a hydrolysis reaction.

3 The bond formation is important for growth of an organism and when the bond forms, a water molecule is removed.

Which properties of water are dependent on hydrogen bonding between water molecules?