Biological molecules: overview
20 review questions with answers for Biological molecules: overview. Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
Which elements are found in all carbohydrates?
- C, H, O and N
- C, H, O and P
- C, H and ORight answer
- C, H, N and S
What this set covers
This is a mixed review of the whole biological molecules topic, with questions on elements, metabolism, condensation, glycosidic and ester bonds, glycogen, cellulose, triglycerides, membrane phospholipids, nucleotides and steroids.
- Common mix-up
- Students often pick the wrong bond for the wrong molecule: glycosidic bonds join monosaccharides, ester bonds join fatty acids to glycerol, and peptide bonds link amino acids.
- Review tip
- Before answering, say aloud which class of molecule the question is about and name its monomer and bond, then use that to rule out the wrong options.
All 20 questions and answers
Which elements are found in all carbohydrates?
Answer: C, H and O
Which statement best defines metabolism?
Answer: All enzyme-catalysed reactions in a cell or organism
What happens in a condensation reaction?
Answer: Two monomers join and water is released
What is the difference between α-glucose and β-glucose?
Answer: The position of an –OH group
Why is glycogen highly branched?
Answer: Many ends allow glucose to be released rapidly
Why does cellulose form straight chains while amylose coils?
Answer: Cellulose is made of β-glucose
A triglyceride forms by condensation between one glycerol and what?
Answer: Three fatty acids
Some fatty acids have a bend in their chain. What causes it?
Answer: H atoms on the same side of a C=C bond
In a membrane, why do the phospholipid tails point inwards?
Answer: The tails are hydrophobic, so are repelled by water
Why do humans still store some energy as glycogen rather than only as fat?
Answer: Glucose can be mobilised and transported fast
Which element is found in proteins and nucleic acids but not in carbohydrates?
Answer: Nitrogen
Which type of metabolism builds larger molecules from smaller ones?
Answer: Anabolism
Which reaction uses water to break a bond between two monomers?
Answer: Hydrolysis
What is the monomer of nucleic acids such as DNA and RNA?
Answer: Nucleotide
Which bond links two monosaccharides together?
Answer: Glycosidic bond
Which disaccharide is made from two α-glucose molecules?
Answer: Maltose
Which plant energy-storage polysaccharide is made of amylose and amylopectin?
Answer: Starch
Which type of bond joins a fatty acid to glycerol?
Answer: Ester bond
What term describes a fatty acid with no C=C double bonds in its chain?
Answer: Saturated
Which type of lipid is built from four fused carbon rings, such as testosterone?
Answer: Steroid
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.