The structure of cellulose is held together by which type of bond?
1, 2 and 3
1 and 2 only
2 and 3 only
1 and 3 only
Did this page help you?
Syllabus Edition
First teaching 2023
First exams 2025
The structure of cellulose is held together by which type of bond?
1, 2 and 3
1 and 2 only
2 and 3 only
1 and 3 only
Did this page help you?
Which bonds are found in glycogen?
Did this page help you?
Where are the double bonds located in unsaturated lipid molecules?
Within fatty acids chains and within glycerol molecules
Between glycerol molecules and fatty acids chains
Within glycerol molecules only
Within fatty acid chains only
Did this page help you?
Which of the molecules below is α-glucose?
Did this page help you?
A biological molecule is shown in the image below.
Which of the following could be the molecule in the image?
1, 2 and 4
1 and 2 only
1 and 3 only
2 and 4 only
Did this page help you?
The diagrams below show a number of biological molecules.
Which of the molecules above contains a glycosidic bond?
1 and 3 only
1, 2 and 4
1 and 2 only
1 only
Did this page help you?
Which of the following features distinguishes starch from glycogen?
Starch contains 1,6-glycosidic bonds
Starch contains α-glucose and not β-glucose
Starch is a polysaccharide
Starch has an unbranched component
Did this page help you?
Which molecule in the image below contains ester bonds?
Did this page help you?
Which of the following types of bond is responsible for joining smaller molecules together to form biological polymers?
Covalent
Hydrogen
Hydrophobic interactions
Ionic
Did this page help you?
Which of the following statements about triglycerides is not correct?
They play a vital role in energy storage within an organism
They are hydrophobic
Only triglycerides with unsaturated fatty acid chains contain double bonds
They are made up of three fatty acids combined with glycerol
Did this page help you?
Two biological molecules are shown in the diagram below.
Which row of the table correctly identifies features of these molecules?
Molecule 1 | Molecule 2 | |
A | has 3 fatty acid chains | fatty acid chains are all saturated |
B | has 2 ester bonds and a phosphate group | has 3 phosphodiester bonds |
C | has 3 saturated fatty acid chains | has 1 unsaturated fatty acid chain |
D | molecule is polar | molecule is polar |
Did this page help you?
Two molecules of glucose are shown in the diagram below.
Possible bonding positions are labelled h, i, j, and k on the first molecule, and m, n, o and p on the second.
When these two molecules condense to form amylopectin, between which of the letters on the diagram could bonds form?
o — i or k — p
p — i or p — k
i — n or m — h
p — k or n — i
Did this page help you?
Which of the following occurs when sucrose is formed from monosaccharides?
Condensation of non-reducing sugars, using water
Condensation of reducing sugars, using water
Condensation of reducing sugars, releasing water
Condensation of non-reducing sugars, releasing water
Did this page help you?
The molecular structure of starch means that starch is well suited to its function.
Which of the following statements best explains this?
Many condensation reactions break down amylose and amylopectin, releasing stored energy
The amylose-amylopectin complex is soluble for easy transport in the phloem
Amylopectin is coiled to give a compact structure; this allows easy transport around the plant through the phloem
The amylose-amylopectin complex is insoluble so it does not affect the water potential of the cell
Did this page help you?
A naturally occurring polysaccharide has an unbranched chain structure which contains molecules of acetylglucosamine held together by β-1,4-glycosidic bonds.
There are many weaker bonds between the unbranched chains, and -CH2OH groups are located on alternate sides of the polysaccharide chain.
Which of the following polysaccharides has a structure similar to that described above?
Glycogen
Cellulose
Amylopectin
Amylose
Did this page help you?
Which of the following shows the structure of β-glucose and α-glucose?
Did this page help you?
Which of the following statements correctly describes a feature of carbohydrates or lipids?
Glycosidic bonds form during hydrolysis reactions, joining monosaccharides together to form disaccharides and polysaccharides.
A triglyceride is not an example of a polymer as it is not formed from smaller subunits joined together by covalent bonds.
A triglyceride is not an example of a polymer although it is formed from smaller subunits joined together.
Glycosidic bonds join disaccharides together to form monosaccharides and polysaccharides.
Did this page help you?
Which of the following procedures could be applied sucrose to achieve a positive test result?
1, 2 and 3
1 and 2 only
2 and 3 only
1 and 3 only
Did this page help you?
Which of the statements below correctly describes a disaccharide?
Sugars formed from two subunits joined together by a covalent bond that forms during a hydrolysis reaction.
Sugars formed from two subunits joined together by a glycosidic bond that forms during a hydrolysis reaction.
Sugars formed from two subunits joined together by a glycosidic bond that forms during a condensation reaction.
Starches formed from two subunits joined together by a covalent bond that forms during a condensation reaction.
Did this page help you?
All biological molecules have structures that relate to their functions.
Three statements relating to molecule structure are given below:
Which of the options below would all three statements above apply to?
Amylose and amylopectin
Cellulose
Amylose and cellulose
Amylose
Did this page help you?
The diagram below shows the molecular structures of two molecules.
Which of the above statements are true?
1 and 3 only
1, 2 and 4
2 and 4 only
2 only
Did this page help you?
A number of biological molecules are shown in the diagram below.
Which row of the table below correctly identifies some of the products of hydrolysis of the molecules above?
Q | R | S | T | |
A | -glucose | -glucose | glycerol | -glucose |
B | -glucose | -glucose | fatty acids | -glucose |
C | -glucose | -glucose | glycerol | -glucose |
D | -glucose | -glucose | phosphate group | -glucose |
Did this page help you?
Which of the statements above are not true?
1 and 3 only
1, 2 and 3
2 and 4 only
4 only
Did this page help you?
Which of the following molecules would have a structural formula that contains C=O bonds?
1 and 2 only
2 and 3 only
1 only
3 only
Did this page help you?
The names of four biological molecules are given below:
Which of the following combinations contains a disaccharide that would act as a reducing agent when mixed with copper (II) sulfate ions, and a disaccharide that wouldn't?
1 and 3
1 and 4
2 and 3
3 and 4
Did this page help you?
Which of the statements above are not true?
1 and 2
2 and 3
1, 2 and 3
None of the above
Did this page help you?
Lactose is a disaccharide that can be broken down to two different monosaccharides, one of which is galactose.
Which of the following correctly describes what occurs when lactose breaks down?
Hydrolysis, releasing galactose and glucose and using water
Condensation of galactose and glucose, using water
Hydrolysis, releasing maltose and galactose and using water
Condensation, releasing maltose and galactose, releasing water
Did this page help you?
Which of the following is a correct description?
Sucrose and maltose are disaccharides that do not react with Cu2+ ions in Benedict's reagent, resulting in no colour change signifying that reducing sugars are present
Sucrose and maltose are disaccharides, sucrose is a reducing sugar that can donate electrons to Cu2+ ions in Benedict's reagent, resulting in a colour change whereas maltose does not reduce Cu2+ ions
Sucrose and maltose are disaccharides that do not react with Cu2+ ions in Benedict's reagent, resulting in no colour change signifying that non-reducing sugars are present
Sucrose and maltose are disaccharides, maltose is a reducing sugar that can donate electrons to Cu2+ ions in Benedict's reagent, resulting in a colour change whereas sucrose does not reduce Cu2+ ions
Did this page help you?
Which of the following is a correct description of a monosaccharide?
An OH group projects below the plane of the ring of 1C and 4C in -glucose, and above the plane of the ring of 2C and 4C in -glucose.
An OH group projects below the plane of the ring of 1C and 4C in -glucose, and above the plane of the ring of 2C and 1C in -glucose
An OH group projects below the plane of the ring of 1C and 3C in -glucose, whereas the OH group projects above the plane of 1C in -glucose.
An OH group projects above the plane of the ring of 1C and 3C in -glucose, whereas the OH group projects below the plane of 1C in -glucose.
Did this page help you?
Glycosidic bonds join monosaccharides together to form disaccharides and polysaccharides. Peptide bonds join amino acid subunits together to form polypeptide chains. Triglyceride molecules contain three fatty acid chains joined to one glycerol molecule via three ester bonds.
Which of the following statements correctly describes a feature all of the polymers described above share?
They all contain monomers which are formed by many smaller molecules joined together by hydrogen bonds, which form during condensation reactions.
They all contain monomers which are formed by many smaller molecules joined together by hydrogen bonds, which form during condensation reactions.
They all contain monomers which are formed by many smaller molecules joined together by covalent bonds, which form during condensation reactions.
They all contain monomers which are formed by many smaller molecules joined together by covalent bonds, which form during hydrolysis reactions.
Did this page help you?