Which of the following biological molecules contains the elements carbon, hydrogen and oxygen?I. carbohydratesII. proteinsIII. fats
  • I and II only
  • I and III only
  • II and III only
  • I, II and III
Which of the following biological molecules contains the element nitrogen?
  • carbhydrates
  • proteins
  • fats
  • all of the above
What is the function of protein in the body?
  • cell growth and repair
  • energy storage
  • quick energy
  • pushes food through the digestive system
Which of the following biological molecules has a role in energy storage?
  • protein
  • carbohydrate
  • fat
  • vitamins
Which of the following molecules is a quick source of energy?
  • carbohydrate
  • fat
  • protein
  • water
Which of the following is a good solvent in the body?
  • fat
  • protein
  • carbohydrate
  • water
Water acts as a solvent in the body.Which of these body processes are possible because water is a solvent?I. transport of materialsII. digestionIII. excretion of waste
  • I and II only
  • I and III only
  • II and III only
  • I, II and III
Which carbohydrate strengthens plant cell walls?
  • glucose
  • starch
  • glycogen
  • cellulose
Which carbohydrate is stored in animal cells?
  • glycogen
  • starch
  • glucose
  • cellulose
Which carbohydrate is used for respiration?
  • cellulose
  • glucose
  • starch
  • glycogen
Which carbohydrate is stored in plant cells?
  • cellulose
  • glycogen
  • glucose
  • starch
Which biological molecule is made by joining amino acids together?
  • fat
  • protein
  • carbohydrate
  • water
Which biological molecule is made by joining together glycerol and fatty acids?
  • cellulose
  • protein
  • carbohydrate
  • fat
Which of the following statements about starch and glycogen is correct?
  • Starch is found in plant cells and glycogen is found in animal cells. They are used directly for respiration.
  • Starch is found in animal cells and glycogen is found in plant cells. They are used directly for respiration.
  • Starch is found in plant cells and glycogen is found in animal cells. They are storage carbohydrates.
  • Starch is found in animal cells and glycogen is found in plant cells. They are storage carbohydrates.
Which of the following biological molecules are made of glucose?I. celluloseII. glycogenIII. starch
  • I and II only
  • I and III only
  • II and III only
  • I, II and III
Which of the following biological molecules contain a type of acid?I. carbohydratesII. fatsIII. proteins
  • I and II only
  • I and III only
  • II and III only
  • I, II and III
Which type of biological molecule is shown in the picture?
sc-6 sb-1-Biological Moleculesimg_no 426.jpg
  • carbohydrate
  • fat
  • protein
  • vitamin
Which of the following are very long carbohydrate molecules?I. celluloseII. glucoseIII. glycogen
  • I and II only
  • I and III only
  • II and III only
  • I, II and III
Which of the following are true for both starch and a protein?I. They are long chainsII. They contain nitrogenIII. They contain hydrogen
  • I only
  • I and II only
  • I and III only
  • III only
In humans, if too much glucose is present in the blood, it is taken to the liver. In the liver these extra glucose molecules are joined together to form a larger carbohydrate.What is the name of this larger carbohydrate?
  • starch
  • cellulose
  • glycogen
  • glycerol
Which of the following could make one protein different to another protein?I. the number of amino acids it containsII. the sequence of amino acidsIII. they contain amino acids
  • I and II only
  • I and III only
  • II and III only
  • I, II and III
A sample of egg albumen (protein) solution was tested using the biuret test. Which one shows the result of the test and the deduction which can be made?
sc-6 sb-5-Biological Moleculesimg_no 154.jpg
  • A
  • B
  • C
  • D
What shows that a solution contains protein?
sc-6 sb-5-Biological Moleculesimg_no 155.jpg
  • A
  • B
  • C
  • D
Which food substance would produce a brick red precipitate when boiled with Benedict’s solution?
  • fat
  • protein
  • reducing sugar
  • starch
A food containing fats is tested with ethanol emulsion test. what would be the positive result?
  • remains clear
  • cloudy white emulsion forms
A food substance is tested with three reagents. Iodine solution remains brown. The biuret test gives a purple colour. The ethanol test gives an emulsion. Which nutrient(s) does the food substance contain?
sc-6 sb-5-Biological Moleculesimg_no 156.jpg
  • A
  • B
  • C
  • D
The diagram shows cells from a storage organ of a plant.The structures X are stained blue-black by iodine solution. (Hint: Plants photosynthesise to produce glucose. Excess glucose is stored as _____?)What does X contain?
sc-6 sb-5-Biological Moleculesimg_no 157.jpg
  • glycogen
  • starch
  • fat
  • amino acids
What is the basic unit to build proteins?
  • glucose
  • amino acids
  • fatty acids and glycerol
What is starch made from?
  • glucose
  • amino acids
  • fatty acids and glycerol
What are the basic units to make fats?
  • glucose
  • amino acids
  • fatty acids and glycerol
Starch (substrate) is digested to maltose (product) by the enzyme amylase. According to the ‘lock and key’ hypothesis, which is the ‘key’ and which is the ‘lock’?(Hint: SKII - substrate is the key, so enzyme must be the lock.)
sc-6 sb-5-Biological Moleculesimg_no 158.jpg
  • A
  • B
  • C
  • D
Lipase digests fats (substrate) into fatty acids and glycerol (products).According to the lock and key hypothesis, which is the lock and which is the key for the enzyme lipase?Note: Fats are also called lipids.
sc-6 sb-5-Biological Moleculesimg_no 159.jpg
  • A
  • B
  • C
  • D
The diagrams represent the activity of an enzyme.What of the following is correct?
sc-6 sb-5-Biological Moleculesimg_no 160.jpg
  • 1 - enzyme
  • 2 - active site
  • 3 - substrate
  • 4 - enzyme
Which of the following are proteins and increase the rate of biochemical reactions?
  • Enzymes
  • Genes
  • Hormones
  • Vitamins
What kind of molecule could be an enzyme?
  • fat
  • glucose
  • protein
  • starch
Which statement is true of all enzymes?
  • They are changed by the chemical reactions they speed up.
  • They are destroyed by temperatures above 40°C.
  • They are proteins.
  • They digest food in the alimentary canal.
Which statement is true for an enzyme?
  • It absorbs the sun's energy during photosynthesis.
  • It catalyses biological reactions.
  • It is destroyed by temperatures below 20 °C.
  • It slows down reactions in a cell.
The graph shows the effect of temperature on the digestion of starch.At which temperature are starch molecules broken down most rapidly?
sc-6 sb-5-Biological Moleculesimg_no 161.jpg
  • 10 °C
  • 30 °C
  • 40 °C
  • 50 °C
Activity of enzymes is affected by temperature and pH.
  • True
  • False
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