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245 questions found · practise this subject as a set Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
221	Which amino acid is optically inactive?	Chemistry Amino acids and proteins	Easy
222	How many peptide bonds are present in a pentapeptide?	Chemistry Amino acids and proteins	Easy
223	Which level of protein structure is NOT affected when egg white is boiled?	Chemistry Amino acids and proteins	Medium
224	How many different tripeptides can be made from glycine, alanine and valine if each is used exactly once?	Chemistry Amino acids and proteins	Medium
225	What holds the α-helix of a protein in shape?	Chemistry Amino acids and proteins	Hard
226	Most enzymes are chemically which type of substance?	Chemistry Enzymes	Easy
227	Which enzyme hydrolyses maltose into glucose?	Chemistry Enzymes	Easy
228	How does an enzyme increase the rate of a biochemical reaction?	Chemistry Enzymes	Medium
229	Why does an enzyme stop working when it is heated strongly?	Chemistry Enzymes	Medium
230	An enzyme acts on sucrose but not on lactose, though both are disaccharides. Which idea best explains this?	Chemistry Enzymes	Hard
231	Deficiency of which vitamin causes scurvy?	Chemistry Vitamins	Easy
232	Which set contains only fat-soluble vitamins?	Chemistry Vitamins	Easy
233	Why must vitamin C be included in the diet regularly?	Chemistry Vitamins	Medium
234	A patient's blood takes unusually long to clot. A deficiency of which vitamin is most likely?	Chemistry Vitamins	Medium
235	Which pairing of vitamin and deficiency disease is correct?	Chemistry Vitamins	Hard
236	Which base is found in RNA but not in DNA?	Chemistry Nucleic acids	Easy
237	What is the difference between a nucleoside and a nucleotide?	Chemistry Nucleic acids	Easy
238	A sample of double-stranded DNA contains 30% adenine. What percentage of guanine does it contain?	Chemistry Nucleic acids	Medium
239	Which sugar is present in DNA?	Chemistry Nucleic acids	Medium
240	Which statement about the DNA double helix is correct?	Chemistry Nucleic acids	Hard