Which one of the following is not a biological role of water?
- prevents deficiency diseases
- dissolves biochemical compounds
- provides a medium in which chemical reactions take place
- involved in the hydrolysis of foodstuffs
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Which one of the following is not a biological role of water?
Which combination of the following substances is best to prevent rickets?
The diagram below is a schematic drawing, which means that the molecules represented may not resemble their actual chemical shape. Use the information provided in the diagram to answer the following questions:
The table below gives nutrients present in various dry seeds.
The following histogram shows the different amounts of nutrients found in one of the four seeds.
The chart shows the nutrients found in:
The graph below illustrates that enzymes:
The following diagrams show the enzyme lock-and key method of action.
Label each of the letters.
Explain briefly how you would test for glucose.
Study the graph below. The graph shows total protein (in grams) present in a 100 grams of different food items. Use the graph to answer questions below.
Name the two foods from which vegetarians would obtain the most protein.
Which foods contains only \(\text{2}\%\) protein?
Which food would be the best for a non-vegetarian person who is suffering from kwashiorkor and anaemia?
Name and explain the process which proteins undergo when heated excessively.
Study the information in the following diagrams and the table below, for three different meals X, Y and Z.
Meals | Energy (in \(\text{kJ}\)) | Vitamin C (in \(\text{mg}\)) | Calcium (in \(\text{mg}\)) |
X | \(\text{2 900}\) | \(\text{25}\) | \(\text{70}\) |
Y | 2100 | 47 | 265 |
Z | \(\text{2 600}\) | 40 | 170 |
Name three polysaccharide carbohydrates in meal X.
Giving one reason for each answer, which meal will:
Meal Z is relatively low in lipids (fat) yet high in energy content.
Which of the food components in Z provides the energy?
Which of the three meals can be regarded as the healthiest?
Give three reasons for your answer.
Any other logical answer.
The following information (given in the table below) appeared on a box of breakfast cereal. Use this information in the table to assist you in answering the questions that follow.
How many servings does a person need to provide the RDA of energy?
\(\text{3,6}\) servings
(3125 / 875)
Which organic compounds are the most important energy providers?
How much energy do the vitamins in the cereal provide?
What deficiency disease could result if a person does not obtain adequate amounts of vitamin B1?
Explain the role of iron in the diet.
Consider the RDA of energy (\(\text{3 125}\) \(\text{kJ}\)). Do you think this amount is realistic for your requirements? Explain your answer.
No. Young adults need more energy than \(\text{3 125}\) \(\text{kJ}\). According to the RDA, young adults need at least:
TOTAL: \(\text{7 020}\) \(\text{kJ}\)
The histograms below show the percentage of carbohydrates, fats, proteins and water in eight types of foods.
From the information provided in the histograms above, name two types of food that:
Contain more than \(\text{25}\%\) of a nutrient that is involved in the formation of an insulating layer
Would best help to prevent kwashiorkor
Will form only monosaccharides and amino acids after digestion
Are not involved in the formation of cell membranes
Contain more than \(\text{50}\%\) of a nutrient which is the primary source of energy
The diagram shows the apparatus used in various organic food tests. Study it and answer the questions that follow:
Name the nutrients tested for in each of the experiments numbered A, B, C and D.
Identify the chemicals numbered 1, 2 and 3.
State the colour change for a positive reaction in each of the test tubes used in the experiments numbered B, C and D.
Identify each of the compounds A, B and C. In each case give a reason for your answer.
Which compound (A, B or C)
The figure below shows the differences between the upper and lower basin of a water body.
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