4 biological molecules
闪卡自测
True or False? Carbohydrates, proteins, and lipids contain carbon.
所有闪卡
闪卡 1
问题
True or False? Carbohydrates, proteins, and lipids contain carbon.
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答案
True. Carbohydrates, proteins, and lipids contain carbon.
闪卡 2
问题
What are the chemical elements present in carbohydrates?
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答案
Carbohydrates are made of carbon, oxygen and hydrogen.
闪卡 3
问题
True or False? Starch, glycogen, and cellulose are all made of glucose.
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答案
True. Starch, glycogen, and cellulose are all carbohydrates built from many molecules of glucose joined together.
闪卡 4
问题
What are the chemical elements present in proteins?
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答案
Proteins contain carbon, oxygen, hydrogen and nitrogen. Some contain small amounts of other elements such as sulfur.
闪卡 5
问题
What is the product when proteins are broken down into smaller molecules?
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答案
When proteins are broken down into smaller molecules amino acids are produced.
闪卡 6
问题
What are the chemical elements present in lipids?
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答案
Lipids are made of carbon, oxygen and hydrogen.
闪卡 7
问题
True or False? Fats and oils are built from many glycerol molecules.
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答案
False. Each molecule within fats and oils contain a single glycerol molecules joined to three fatty acids.
闪卡 8
问题
What is the test for starch?
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答案
The test for starch involves adding iodine solution to a food sample. A positive result is a colour change from orange-brown to blue-black.
闪卡 9
问题
True or False? A positive iodine test will turn the solution from red to blue-black.
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答案
False. A positive test for starch using iodine will turn the solution from brown/orange to blue-black.
闪卡 10
问题
What is the test for glucose (a reducing sugar)?
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答案
The test for glucose involves adding Benedict's solution to a sample and heating it in a boiling water bath. A positive result is a colour change from blue to brick red.
闪卡 11
问题
What is the starting colour of Benedict's solution?
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答案
The starting colour of Benedict's solution is blue.
闪卡 12
问题
What is the test for the presence of protein?
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答案
The protein test involves adding Biuret solution to a food sample. A positive result is a colour change from blue to violet/purple.
闪卡 13
问题
What is the starting colour of Biuret solution?
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答案
The starting colour of Biuret solution is blue.
闪卡 14
问题
What is the test for lipids?
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答案
The test for lipids involves mixing a sample with ethanol and then adding the ethanol solution to cold water. A positive result is a cloudy white emulsion forming. Note that a sample containing solid pieces of food may need to be strained before a positive result can be clearly seen.
闪卡 15
问题
What does the DCPIP test for vitamin C involve?
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答案
The DCPIP test for vitamin C involves the addition of a food sample to blue DCPIP solution. If vitamin C is present then the DCPIP will become colourless.
闪卡 16
问题
Which of the food tests must be heated to observe the results?
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答案
The Benedict's test for glucose (a reducing sugar) must be heated to observe the results.
闪卡 17
问题
Describe the structure of DNA. (Extended Tier Only)
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答案
DNA consists of two strands coiled around each other to form a double helix. The strands are held together by a series of paired bases with bonds in between.
闪卡 18
问题
Identify the four nucleotide bases found in DNA. (Extended Tier Only)
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答案
The four nucleotide bases in DNA are:
闪卡 19
问题
True or False? Nucleotide base A pairs with G in DNA. (Extended Tier Only)
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答案
False. A pairs with T in DNA base pairing.
闪卡 20
问题
Describe how bases pair together in DNA. (Extended Tier Only)
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答案
Bases in DNA pair together via complementary base pairing:
闪卡 21
问题
What sequence of bases would pair with the DNA base sequence below (Extended Tier Only): ACCGTTTGCAA
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答案
The base sequence would be paired as follows: ACC GTT TGC AA TGG CAA ACG TT