Molecular Biology

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Molecules to metabolism

Subtopic

Molecules to metabolism under Molecular Biology for Grade 12 IB.

Preview questions (no answers)

1.
$Which of the following is classified as an inorganic carbon compound in the study of Biology?$
A. $C_{6}H_{12}O_{6}$
B. $Stearic acid (a fatty acid)$
C. $Glycine (an amino acid)$
D. $CO_{2}$
2.
$In the chemical reaction shown in the diagram, what is the specific name for the process that joins two monosaccharides together?$
A. $Hydrolysis$
B. $Condensation$
C. $Oxidation$
D. $Reduction$
3.
$Which term describes the sum of all enzyme-catalyzed reactions that occur within a living cell or organism?$
A. $Metabolism$
B. $Anabolism$
C. $Catabolism$
D. $Vitalism$

Download the worksheet for Molecular Biology - Molecules to metabolism to practice offline. It includes additional chapter-level practice questions.

Water

Subtopic

Water under Molecular Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

1.
$Water is often used as a coolant in sweat. Which thermal property of water allows it to be an effective coolant?$
A. $High specific heat capacity$
B. $High latent heat of vaporization$
C. $Transparency to light$
D. $Higher density in liquid form than solid form$
2.
$Which of the following substances is hydrophobic and therefore insoluble in water?$
A. $Sodium chloride$
B. $Glucose$
C. $Amino acids$
D. $Cholesterol$
3.
$What type of bond forms between the slightly positive hydrogen atom of one water molecule and the slightly negative oxygen atom of an adjacent water molecule?$
A. $Non-polar covalent bond$
B. $Hydrogen bond$
C. $Ionic bond$
D. $Polar covalent bond$

Download the worksheet for Molecular Biology - Water to practice offline. It includes additional chapter-level practice questions.

Carbohydrates and lipids

Subtopic

Carbohydrates and lipids under Molecular Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

1.
$In which form do plants primarily store excess glucose for later use as energy?$
A. $Glycogen$
B. $Cellulose$
C. $Starch$
D. $Sucrose$
2.
$Which statement correctly describes the physical properties of most saturated fatty acids?$
A. $They contain one or more double bonds in the hydrocarbon chain.$
B. $They are typically solid at room temperature.$
C. $They are primarily found in plant-based oils.$
D. $They have a 'kinked' structure that prevents tight packing.$
3.
$How many water molecules are produced during the formation of a single triglyceride molecule from its constituent parts?$
A. $1$
B. $2$
C. $3$
D. $4$

Download the worksheet for Molecular Biology - Carbohydrates and lipids to practice offline. It includes additional chapter-level practice questions.

Proteins

Subtopic

Proteins under Molecular Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

1.
$Which protein is responsible for providing high tensile strength in structures such as skin, tendons, and ligaments?$
A. $Insulin$
B. $Immunoglobulin$
C. $Collagen$
D. $Rhodopsin$
2.
$Which of the following describes the effect of high temperatures on most proteins?$
A. $The primary sequence of amino acids is broken apart.$
B. $The protein's three-dimensional conformation is altered, leading to a loss of function.$
C. $The protein becomes more stable and resistant to chemical changes.$
D. $The R-groups are converted into different functional groups.$
3.
$What type of covalent bond is formed between the carboxyl group of one amino acid and the amino group of another during a condensation reaction?$
A. $Glycosidic bond$
B. $Peptide bond$
C. $Ester bond$
D. $Hydrogen bond$

Download the worksheet for Molecular Biology - Proteins to practice offline. It includes additional chapter-level practice questions.

Enzymes

Subtopic

Enzymes under Molecular Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

1.
$Which change most likely causes the denaturation of an enzyme?$
A. $A slight decrease in substrate concentration$
B. $5^{\circ}C$
C. $A significant change in the pH of the environment$
D. $Increasing the concentration of the enzyme$
2.
$In the provided diagram of an enzymatic reaction, which label represents the enzyme-substrate complex?$
A. $Label A$
B. $Label C$
C. $Label D$
D. $Label B$
3.
$What is the specific region of an enzyme molecule where the substrate binds and the reaction occurs?$
A. $The active site$
B. $The allosteric site$
C. $The tertiary structure$
D. $The catalytic inhibitor$

Download the worksheet for Molecular Biology - Enzymes to practice offline. It includes additional chapter-level practice questions.

Structure of DNA and RNA

Subtopic

Structure of DNA and RNA under Molecular Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

1.
$What is the nitrogenous base that replaces Thymine in an RNA molecule?$
A. $Guanine$
B. $Uracil$
C. $Adenine$
D. $Cytosine$
2.
$Which sugar is found specifically in the structure of RNA nucleotides?$
A. $Glucose$
B. $Deoxyribose$
C. $Fructose$
D. $Ribose$
3.
$In a DNA molecule, which nitrogenous base always pairs with Cytosine?$
A. $Adenine$
B. $Thymine$
C. $Guanine$
D. $Uracil$

Download the worksheet for Molecular Biology - Structure of DNA and RNA to practice offline. It includes additional chapter-level practice questions.

DNA replication, transcription and translation

Subtopic

DNA replication, transcription and translation under Molecular Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

1.
$Which molecule is synthesized as a direct result of transcription?$
A. $mRNA$
B. $tRNA$
C. $DNA$
D. $Polypeptide$
2.
$In which part of a eukaryotic cell does the process of transcription occur?$
A. $Cytoplasm$
B. $Nucleus$
C. $Ribosome$
D. $Golgi apparatus$
3.
$Which enzyme is responsible for unzipping the DNA double helix by breaking hydrogen bonds during replication?$
A. $DNA Ligase$
B. $DNA Polymerase I$
C. $RNA Primase$
D. $DNA Helicase$

Download the worksheet for Molecular Biology - DNA replication, transcription and translation to practice offline. It includes additional chapter-level practice questions.

Cell respiration

Subtopic

Cell respiration under Molecular Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

1.
$In the following simplified metabolic pathway, which label represents the process of anaerobic respiration in yeast cells?$
A. $Pathway A$
B. $Pathway B$
C. $Pathway C$
D. $Pathway D$
2.
$What are the final products of anaerobic respiration in humans?$
A. $CO_{2}$
B. $NAD^{+}$
C. $Lactate$
D. $CO_{2}$
3.
$In which part of a eukaryotic cell does glycolysis occur?$
A. $Mitochondrial matrix$
B. $Inner mitochondrial membrane$
C. $Cytoplasm$
D. $Nucleus$

Download the worksheet for Molecular Biology - Cell respiration to practice offline. It includes additional chapter-level practice questions.

Photosynthesis

Subtopic

Photosynthesis under Molecular Biology for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

1.
$O_{2}$
A. $H_{2}O$
B. $CO_{2}$
C. $Chlorophyll$
D. $Glucose$
2.
$Which of the following are the two main products of the light-dependent reactions that are required for the light-independent reactions (Calvin cycle)?$
A. $CO_{2}$
B. $O_{2}$
C. $O_{2}$
D. $ATP and NADPH$
3.
$Where do the light-dependent reactions of photosynthesis occur in a eukaryotic plant cell?$
A. $The stroma of the chloroplast$
B. $The thylakoid membranes of the chloroplast$
C. $The mitochondrial matrix$
D. $The cytosol$

Download the worksheet for Molecular Biology - Photosynthesis to practice offline. It includes additional chapter-level practice questions.

Molecular Biology

Molecules to metabolism

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Water

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Carbohydrates and lipids

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Proteins

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Enzymes

❓Preview questions (no answers)

Structure of DNA and RNA

❓Preview questions (no answers)

DNA replication, transcription and translation

❓Preview questions (no answers)

Cell respiration

❓Preview questions (no answers)

Photosynthesis

❓Preview questions (no answers)

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