The reactivity of an atom arises from Correct Answer: the existence of unpaired electrons in the valence shell.
Covalent bonds differ from ionic and metallic bonds because in covalent bonding Correct Answer: pairs of electrons are shared
Water contains 2 atoms of hydrogen and 1 atom of oxyg...
LQB182 EXAM QUESTIONS AND ANSWERS| VERIFIED
The reactivity of an atom arises from Correct Answer: the existence of unpaired electrons in the
valence shell.
Covalent bonds differ from ionic and metallic bonds because in covalent bonding Correct
Answer: pairs of electrons are shared
Water contains 2 atoms of hydrogen and 1 atom of oxygen. What bond type holds these together
Correct Answer: Covalent boding
True or False? Polymerisation of monomers occurs due to covalent bonding between monomer
units Correct Answer: True
The simplest hydrocarbons are comprised of _________. Correct Answer: hydrogen and carbon
Carbohydrates, Proteins, and DNA have monomers of _______. Correct Answer:
monosaccharide, amino acid, and nucleotide, respectively.
True or False. Non-polar molecules are hydrophilic? Correct Answer: FALSE
What parts of the amino acids Y and Z are involved in the formation of a peptide bond? Correct
Answer: carboxyl group of Y and amino group of Z
A disulphide bridge can form between which of the same two amino acid residues? Correct
Answer: Cysteine
Polypeptide chains are formed from amino acid monomers via the process of ________. Correct
Answer: dehydration
An alpha-helix is a type of what level of protein structure? Correct Answer: Secondary structure
Which of the following statements is true about proteins? Correct Answer: True 3D structure is
revealed upon binding with a target
A dipeptide has ________. Correct Answer: two amino acids and one peptide bonds
The breakdown of polymers into their individual monomers _________. Correct Answer:
requires a water molecule for every bond broken
True or False. The term "insoluble fibre" relates to amylopectin. Correct Answer: F
True or False. Phospholipids contain hydrophobic tails that attract water molecules. Correct
Answer: F
, Hydrophobicity of fatty acids is due to long hydrocarbon tails with nonpolar covalent bonds.
Correct Answer: T
True or False. Triglycerides and triacylglycerol molecules are the same thing. Correct Answer:
T
What are the four main parts of a triglyceride? Correct Answer: Glycerol and three fatty acids
What is not permeable across the phospholipid bilayer of a cell? Correct Answer: Carbohydrate
monomers
A peptide bond is analogous to which of the following in carbohydrates? Correct Answer: a
glycosidic linkage
What does the penultimate carbon of a monosaccharide inform us regarding the type of
monomer? Correct Answer: Whether it is an L- or D- orientation
True or False. Phospholipids and triglycerides both have a glycerol backbone. Correct Answer: t
Covalent & ionic bonds are weaker than hydrogen bonds & dipole-dipole forces. Correct
Answer: f
True or False. Cellulose is predominant in plants and chitin in animals and fungi. Correct
Answer: t
A sugar monomer has six carbons and is therefore a ________. Correct Answer: Hexose
What are "saturated fats" saturated with? Correct Answer: Hydrogen
Dyneins interact with what fibres? Correct Answer: Microtubules
Peroxisomes are known to produce what? Correct Answer: Hydrogen peroxide
A macrophage will engulf and kill a bacteria through a process of: Correct Answer:
phagocytosis
Both prokaryotes and eukaryotes have which of the following: Correct Answer: cytoskeleton,
chromosomes, plasma membrane
Cell motility and contraction is mediated through: Correct Answer: actin
A symport transports two molecules in the same direction across the cell membrane. Correct
Answer: t
An antiport transports two molecules in opposite directions across the cell membrane. Correct
Answer: t
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