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WorksheetsIB Biology Molecules
Total questions: 22
Worksheet time: 19mins
Which molecule is shown?
Amino acid
Glucose
Ribose
Fatty acid
Which is an effect of protein denaturation?
The order of amino acids is changed when the protein overheats.
The bonds between amino acids are broken by condensation.
Parts of the protein become linked together by hydrolysis.
The three-dimensional structure of the protein is altered.
Which type of reaction is the breakdown of starch into sugars?
Denaturation
Reduction
Catabolic
Condensation
The diagram shows a molecular structure. What is it?
Amino acid
Lipid
Carbohydrate
Nucleotide
Which properties explain the ability of water to dissolve solutes?
I. Polarity of water molecules
II. High specific heat capacity of water
III. Hydrogen bonding
I and II only
I and III only
II and III only
I, II and III
What is a similarity between DNA and RNA?
Both are polymers of nucleotides.
Both are composed of antiparallel strands.
Both contain adenine, cytosine and thymine.
Both contain ribose sugar.
A polymer of alpha-D-glucose found in plants has mostly 1,4 linkages and some 1,6 linkages. Which molecule fits this description?
Glycogen
Cellulose
Amylose
Amylopectin
The most abundant structural protein in the human body is found in ligaments and skin. What is the name of this protein?
Collagen
Hemoglobin
Myoglobin
Immunoglobulin
The graph shows the effect of increasing the substrate concentration on the rate of an enzyme-catalysed reaction. What is occurring during the phase indicated by section Y of the graph?
The active site of the enzyme is saturated.
The enzyme becomes denatured.
The substrate concentration has risen too high.
The optimum rate is reached.
The diagram shows the structure of palmitic acid. What type of fatty acid is palmitic acid?
It is monounsaturated.
It is polyunsaturated.
It is saturated.
It is a trans-fatty acid.
What molecule is shown in the diagram?
Ribose
Amino acid
Lipid
Glucose
Which property of water accounts for its moderating effects on the Earth’s atmosphere?
Cohesive
Thermal
Transparency
Adhesive
For which discovery about DNA do Watson and Crick receive credit?
DNA is the molecule that genes are made of.
The amount of adenine equals the amount of thymine in an organism.
Phosphate–pentose bonding along the nucleotide backbone is covalent.
The shape of DNA is a double helix.
The Framingham heart study was an observational study that went on for 20 years. The following data were produced. Which conclusion can be drawn, based on these data?
It is better to eat margarine than to eat butter.
The more margarine consumed, the greater the incidence of coronary heart disease.
Butter is a natural product whereas margarine is hydrogenated vegetable oil that leads to coronary heart disease.
Margarine causes more heart related deaths than butter.
What property of water makes it suitable as a coolant?
It takes a lot of energy to increase the temperature of water.
It takes a lot of energy for water to evaporate.
Water molecules are cohesive and stick to the skin.
Water is a good solvent so it can transport heat from the body.
Which molecule is a polysaccharide?
Cellulose
Fructose
Maltose
Sucrose
The image shows a DNA nucleotide. Which correctly identifies the parts labelled I and II?
base and phosphate
ribose and uracil
deoxyribose and base
ribose and adenine
How can the activity of a human amylase enzyme be increased during a laboratory experiment?
Adding sugar to the mixture.
Decreasing the pH from 7 to 3
Increasing the temperature from 20°C to 37°C.
Adding water to the mixture.
How can the rate of photosynthesis be measured?
I. By the amount of oxygen produced
II. By the increase in biomass
III. By the amount of carbon dioxide produced
I only
I and II only
I and III only
I, II and III
Which pair of molecules are products of aerobic and anaerobic cell respiration in some organisms?
A
B
C
D
The diagram shows a cycle of reactions that occurs in human liver cells. Which term describes the overall reactions of this cycle?
Oxidation
Catabolism
Condensation
Metabolism
Which molecules are monosaccharides?
starch, glycogen, cellulose
sucrose, maltose, lactose
fructose, glucose, galactose
glucose, lactose, cellulose
