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WorksheetsQuiz 1 (MCQ): Topic 1- Molecules of Life
Total questions: 25
Worksheet time: 19mins
The partially negative charge at one end of one water molecule is attracted to the partially positive charge of another water molecule. What is this attraction called?
a covalent bond.
a hydrogen bond.
an ionic bond.
a hydrophilic bond.
Water is a versatile solvent due to its
low viscosity.
polar molecules.
high specific heat.
high boiling point.
At what temperature is water at its densest?
0°C
4°C
36°C
100°C
Water carries out all the following functions of life, EXCEPT that it does NOT act as a
lubricant.
cooling agent.
source of carbon.
chemical reagent.
Which of the following characteristics of water are essential for the proper functioning of tissue fluid?
I. Water has low viscosity
II. Water has high surface tension
III. Water has maximum density at 4ºC
I only
I and II
II and III
I, II and III
Polymers of polysaccharides, proteins and nucleic acid are all synthesised from monomers by
hydration.
condensation.
carboxylation.
hydrolysis
Which of the following carbohydrate will yield two molecules of glucose upon hydrolysis?
fructose.
galactose.
maltose.
ribose.
Glucose and fructose are
isomers
hexose sugars
the building blocks of complex carbohydrates
all of the above
Monosaccharides are water soluble because:
they contain a large number of methyl groups.
they have a large number of polar hydroxyl groups.
they have at least one double bond between adjacent carbons.
they have large numbers of nonpolar carbons in their backbones.
Which of the following is TRUE of both starch and cellulose?
they are both polymers of glucose.
they are both used for storing energy in plants.
they are both used for structure in plant cells.
they both make up a considerable part of the plasma membrane.
All of the following statements concerning saturated fats are TRUE except
They are more common in animals than in plants.
They have multiple double bonds in the carbon chains of their fatty acids.
They generally solidify at room temperature.
They contain more hydrogen than unsaturated fats having the same number of carbon atoms.
Why are human sex hormones considered to be lipids?
They are essential components of cell membranes.
They are steroids, which are not soluble in water.
They are made of fatty acids.
They are hydrophilic compounds.
Which of the following statements does NOT describe a function of lipids?
an electric insulator.
a thermal insulator.
a source rich in energy.
forms parenchyma cell walls.
Why are phospholipids important to cell structure?
phospholipids are part of DNA.
phospholipids contain fatty acid.
phospholipids have a polar and non-polar end.
phospholipids are found only in animals.
What is the structure shown in above?
starch molecule.
protein molecule.
steroid molecule.
phospholipid molecule.
Which of the following structures represents a peptide linkage?
The unique characteristic of each amino acid is determined by
the type of peptide bond.
its position on the polypeptide chain.
its amino group.
its R group
Amino acids can be classified into different groups. Which is NOT one of the groups?
Non-polar group
Acidic
Neutral
Basic
Which statement is FALSE?
The primary structure of protein refers to the linear structure of amino acids.
The primary structure of protein is maintained by hydrogen bonds.
All proteins have primary structure.
Globular proteins such as enzymes, hormones, plasma proteins and myoglobin are examples of protein with tertiary structure.
Which type of bond stabilize the alpha (α) helix and the beta (β) pleated sheet structures of proteins?
peptide bonds.
disulphide bonds.
hydrogen bonds.
ionic bonds.
What are the building blocks of nucleic acids?
Amino acids.
Nucleotides.
Pentose sugars.
Phosphate groups.
The phosphodiester linkage in DNA or RNA is formed between
two nitrogenous bases.
two pentose sugars.
a pentose sugar and a nitrogenous base.
a pentose sugar and a phosphate group.
Choose the CORRECT statement.
The molecular structure of a purine base is a double ring.
The molecular structure of a pyrimidine base is a double ring.
Adenine and thymine are purine bases.
Cytosine and guanine are pyrimidine bases.
The scientists who proposed the double helix model of DNA are
Singer and Nicholson
Watson and Crick
Meselson and Stahl
Jacob and Monod
Which statement is TRUE?
DNA is found in living things but RNA is found in non-living things.
DNA is the hereditary material that contains genetic information of living organisms.
There are three types of DNA and one type of RNA.
Nucleic acids are made up of monomers called fatty acids and glycerol.
