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Biology for IGCSE & O level - Biological Molecules (Section 5)

1
What is the name of the bond that joins two monosaccharides?
Answer
(A)
Glycosidic bond
2
What is the role of the bases in the structure of the DNA?
Answer
(C)
They provide the code for proteins
3
Which of the following is NOT a biological molecule?
Answer
(D)
Water
4
Which of the following is the storage form of glucose in animals?
Answer
(C)
Glycogen
5
What is the name of the small molecules that join together to make proteins?
Answer
(C)
Amino acids
6
What reagent is used to test for the presence of reducing sugars?
Answer
(C)
Benedict's solution
7
Which test is best for identifying lipids?
Answer
(D)
Ethanol test
8
Which of the following is the building block of glycogen?
Answer
(A)
Glucose
9
If you test for reducing sugars with Benedict's solution and the result is green, what does that indicate?
Answer
(A)
A low concentration of reducing sugar
10
What is the result of a positive iodine test for starch?
Answer
(A)
Blue-black
11
In a DNA molecule, which base pairs with guanine?
Answer
(C)
Cytosine
12
Which of the following statements correctly describe the structure of DNA?
Answer
B
C
D
13
What element is NOT typically found in all organic molecules?
Answer
(D)
Nitrogen
14
What is the process called where monomers join to make polymers?
Answer
(B)
Dehydration
15
Which of the following is a storage polysaccharide in animals?
Answer
(C)
Glycogen
16
Which of the following is NOT a function of proteins?
Answer
(C)
Storing genetic information
17
What are the building blocks of a protein?
Answer
(C)
Amino acids
18
What does a double helix refer to in the context of DNA?
Answer
(B)
Two strands of DNA twisted together
19
In which organelle does photosynthesis occur?
Answer
(C)
Chloroplast
20
Which of the following elements is NOT commonly found in all biological macromolecules?
Answer
(D)
Phosphorus
21
What is the main function of fats in the human body?
Answer
(C)
Long-term energy storage
22
What is the name of the process that adds water to break bonds?
Answer
(C)
Hydrolysis
23
Which molecule is formed when many glucose molecules join together?
Answer
(B)
Starch
24
What is a common property of all lipids?
Answer
(C)
They are insoluble in water.