Question bank

Filter questions by subject, topic and difficulty. Open any question to answer it and see the explanation.

7,992 questions found Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
2221	Which enzyme hydrolyses maltose into glucose?	Chemistry Enzymes	Easy
2222	How does an enzyme increase the rate of a biochemical reaction?	Chemistry Enzymes	Medium
2223	Why does an enzyme stop working when it is heated strongly?	Chemistry Enzymes	Medium
2224	An enzyme acts on sucrose but not on lactose, though both are disaccharides. Which idea best explains this?	Chemistry Enzymes	Hard
2225	Deficiency of which vitamin causes scurvy?	Chemistry Vitamins	Easy
2226	Which set contains only fat-soluble vitamins?	Chemistry Vitamins	Easy
2227	Why must vitamin C be included in the diet regularly?	Chemistry Vitamins	Medium
2228	A patient's blood takes unusually long to clot. A deficiency of which vitamin is most likely?	Chemistry Vitamins	Medium
2229	Which pairing of vitamin and deficiency disease is correct?	Chemistry Vitamins	Hard
2230	Which base is found in RNA but not in DNA?	Chemistry Nucleic acids	Easy
2231	What is the difference between a nucleoside and a nucleotide?	Chemistry Nucleic acids	Easy
2232	A sample of double-stranded DNA contains 30% adenine. What percentage of guanine does it contain?	Chemistry Nucleic acids	Medium
2233	Which sugar is present in DNA?	Chemistry Nucleic acids	Medium
2234	Which statement about the DNA double helix is correct?	Chemistry Nucleic acids	Hard
2235	Chemically, insulin belongs to which class of hormones?	Chemistry Hormones	Easy
2236	Which hormone raises the level of glucose in the blood?	Chemistry Hormones	Easy
2237	Thyroxine is an iodinated derivative of which amino acid?	Chemistry Hormones	Medium
2238	Which group of hormones controls the excretion of water and salt by the kidney?	Chemistry Hormones	Medium
2239	In a region where people regularly use salt without added iodide, many develop an enlarged thyroid gland. Wha…	Chemistry Hormones	Hard
2240	A forest officer argues that a watershed forest must be protected because nearby towns depend on it for drink…	Environmental Studies Modern schools of ecological thought	Easy