2015 E.C. · natural · Q7 · Molecular biology / translation
Identify the correct statement regarding translation in eukaryotic cells. The
- A. helicase enzyme begins to unwind a section of DNA.
- B. polymerase assembles free RNA nucleotides into a chain.
- C. first two codons of the mRNA enter the ribosome.
- D. RNA polymerase moves along the antisense strand.
Worked solutionUnofficial
Answer: C
Answer C: first two codons of the mRNA enter the ribosome.. The stem is: Identify the correct statement regarding translation in eukaryotic cells. The Letter C is the Abrari key for this Molecular biology / translation. Options A, B, D describe transcription not translation; C best fits translation but is imprecise (usually first codon). Verify.
📖 G9 Biology, Unit 3, §3.4, p. 60“Prokaryotic cells such as bacterial cells don’t have membrane-bound organelles or a nucleus.”
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2015 E.C. · natural · Q15 · Nucleic acids / DNA
Which one of the following is correct about DNA? It is
- A. smaller molecule and coding for only protein.
- B. made of phosphate, sugar and bases.
- C. a single stranded molecule.
- D. less stable and degrades quickly.
Worked solutionUnofficial
Answer: B
Answer B: made of phosphate, sugar and bases.. The stem is: Which one of the following is correct about DNA? It is Letter B is the Abrari key for this Nucleic acids / DNA.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q27 · Biotechnology / medicine
Industries in the medicine sector use glucose oxidase in clinistix strips for
- A. restoring blood supply to area of heart muscle.
- B. detecting toxic metabolites in the blood.
- C. easy diagnosis of diabetes by examining a urine sample.
- D. reducing the viscosity of mucus.
Worked solutionUnofficial
Answer: C
Answer C: easy diagnosis of diabetes by examining a urine sample.. The stem is: Industries in the medicine sector use glucose oxidase in clinistix strips for Letter C is the Abrari key for this Biotechnology / medicine.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q28 · Enzymes / EC classification
In the systematic naming of enzymes, assume an enzyme is designated as EC 3.4.11.1. Which of the following correctly describes this enzyme?
- A. 11 - gives a sub-subclass to which the enzyme belongs.
- B. 1 - a reference of Enzyme Commission.
- C. 4 - shows to which main class the enzyme belongs.
- D. 3 - indicates a subclass to which the enzyme belongs.
Worked solutionUnofficial
Answer: A
Answer A: 11 - gives a sub-subclass to which the enzyme belongs.. The stem is: In the systematic naming of enzymes, assume an enzyme is designated as EC 3.4.11.1. Which of the following correctly describes this enzyme? Letter A is the Abrari key for this Enzymes / EC classification.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q29 · Enzymes / lock-and-key
Which one of the following sentences explains the lock-and-key model of enzyme action? The
- A. attached substrate- the enzyme complex enters into a transition state.
- B. model explains enzyme inhibition in a complete manner.
- C. shapes of the substrate is complementary to the active site.
- D. attachment of substrate to an enzyme produces a conformational change.
Worked solutionUnofficial
Answer: C
Answer C: shapes of the substrate is complementary to the active site.. The stem is: Which one of the following sentences explains the lock-and-key model of enzyme action? The Letter C is the Abrari key for this Enzymes / lock-and-key.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q30 · Enzymes / apoenzymes
Which one of the following sentences is correct about apo-enzymes? They are
- A. cofactors that give an enzyme its catalytic activity.
- B. proteins that combine with cofactors to form active enzymes.
- C. organic molecules and many are derived from vitamins.
- D. inorganic molecules that bind loosely with the cofactors.
Worked solutionUnofficial
Answer: B
Answer B: proteins that combine with cofactors to form active enzymes.. The stem is: Which one of the following sentences is correct about apo-enzymes? They are Letter B is the Abrari key for this Enzymes / apoenzymes.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q31 · Enzymes / inhibition
How does a competitive inhibitor affect an enzyme catalyzed reaction? By
- A. denaturing the active site of the enzyme.
- B. producing conformational change of the enzyme
- C. binding to the allosteric site of the enzyme
- D. blocking the active site of the enzyme
Worked solutionUnofficial
Answer: D
Answer D: blocking the active site of the enzyme. The stem is: How does a competitive inhibitor affect an enzyme catalyzed reaction? By Letter D is the Abrari key for this Enzymes / inhibition.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q38 · Carbohydrates / glycogen
In animal cells, glycogen is hydrolyzed quickly to release glucose for respiration. This is due to the presence of several
- A. microfibrils in its side chain.
- B. α-1,6-glycosidic bonds.
- C. β-1,4-glycosidic bonds.
- D. enzymes that hydrolyze it easily.
Worked solutionUnofficial
Answer: B
Answer B: α-1,6-glycosidic bonds.. The stem is: In animal cells, glycogen is hydrolyzed quickly to release glucose for respiration. This is due to the presence of several Letter B is the Abrari key for this Carbohydrates / glycogen.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q39 · Enzymes / data interpretation
A student measured rate enhancement of enzymes X, Y, Z, M with different cofactors and optimum temperatures. Which one of the following is an acceptable conclusion?
- A. Enzyme 'X' could have enhanced the rate better at temperature slightly higher than 37°C.
- B. Enzyme 'M' cannot enhance the rate of reaction further if the temperature exceeds 30°C.
- C. The rate enhancement for enzymes 'Z' is less because it didn't use a cofactor.
- D. As temperature increases the rate of chemical reaction decreases.
Worked solutionUnofficial
Answer: C
Answer C: The rate enhancement for enzymes 'Z' is less because it didn't use a cofactor.. The stem is: A student measured rate enhancement of enzymes X, Y, Z, M with different cofactors and optimum temperatures. Which one of the following is an acceptable conclusion? Letter C is the Abrari key for this Enzymes / data interpretation. Data table present in text. C is defensible (Z has no cofactor and lowest enhancement) but correlation not causation; verify intended answer.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q40 · Biomolecule identification
This item is based on the following diagram which depicts structural formula of a biological molecule. [Identify the molecule.]
This item uses a figure in the original paper (not redrawn here).
- A. cellulose.
- B. amylopectin.
- C. fatty acid.
- D. glycerol.
Worked solutionUnofficial
No keyed letter is published for this item. No keyed letter is published for this 2015 E.C. natural item (Biomolecule identification). Image-dependent structural formula; cannot identify without viewing diagram.Try the options yourself, then practise the same subject timed in the app.
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2015 E.C. · natural · Q45 · Biochemistry / organic vs inorganic
In the table shown, which number holds only organic molecules? (1: Calcium carbonate, glucose, methane; 2: Carbon dioxide, linoleic acid, water; 3: Linoleic acid, glucose, methane; 4: Iron III oxide, glycine, glucose)
- A. 2
- B. 3
- C. 4
- D. 1
Worked solutionUnofficial
Answer: B
Answer B: 3. The stem is: In the table shown, which number holds only organic molecules? (1: Calcium carbonate, glucose, methane; 2: Carbon dioxide, linoleic acid, water; 3: Linoleic acid, glucose, methane; 4: Iron III oxide, glycine, glucose) Letter B is the Abrari key for this Biochemistry / organic vs inorganic.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q46 · Digestion / enzymes
Which of the following enzymes is correctly matched to the food stuffs it acts on?
- A. Pepsin - protein
- B. Maltase - lipids
- C. Amylase - fats
- D. Trypsin - starch
Worked solutionUnofficial
Answer: A
Answer A: Pepsin - protein. The stem is: Which of the following enzymes is correctly matched to the food stuffs it acts on? Letter A is the Abrari key for this Digestion / enzymes.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q50 · Cellular respiration
In the aerobic cellular respiration
- A. Krebs cycle takes place in the cytoplasm.
- B. glycolysis takes place in the mitochondria.
- C. electron transport chain takes place in the cytoplasm.
- D. pyruvate enters into the mitochondria for further stages.
Worked solutionUnofficial
Answer: D
Answer D: pyruvate enters into the mitochondria for further stages.. The stem is: In the aerobic cellular respiration Letter D is the Abrari key for this Cellular respiration.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q52 · Cell membrane / proteins
Which one of the following descriptions of proteins is correctly matched with its function in a cell-membrane?
- A. Peripheral proteins - anchor integral proteins to the cytoskeleton
- B. Glycoproteins - reduces the fluidity of the membrane
- C. Channel proteins - larger molecules can pass through them
- D. Carrier proteins - specific ions can pass along them
Worked solutionUnofficial
Answer: A
Answer A: Peripheral proteins - anchor integral proteins to the cytoskeleton. The stem is: Which one of the following descriptions of proteins is correctly matched with its function in a cell-membrane? Letter A is the Abrari key for this Cell membrane / proteins.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q55 · Membrane transport
Which one of the following is correct about transport of substances across the cell membrane?
- A. Simple diffusion - large particles transported through channel proteins
- B. Facilitated diffusion - particles move from high water potential to lower one
- C. Passive transport - particles require energy in the form of ATP to derive the transport
- D. Active transport - particles move from low to higher concentration using carrier proteins
Worked solutionUnofficial
Answer: D
Answer D: Active transport - particles move from low to higher concentration using carrier proteins. The stem is: Which one of the following is correct about transport of substances across the cell membrane? Letter D is the Abrari key for this Membrane transport.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q56 · Cellular respiration / Krebs cycle
Which one of the following processes of aerobic respiration takes place in the Krebs cycle?
- A. Hydrogen atoms carried by reduced NAD and FAD are released and split into protons and electrons.
- B. Two molecules of ATP are used to phosphorylate each molecules of glucose.
- C. Two carbon group from acetyl coenzyme A reacts with a 4-carbon compound to form citrate.
- D. Fructose 1, 6-bisphosphate is split into two molecules of the three-carbon sugar GP.
Worked solutionUnofficial
Answer: C
Answer C: Two carbon group from acetyl coenzyme A reacts with a 4-carbon compound to form citrate.. The stem is: Which one of the following processes of aerobic respiration takes place in the Krebs cycle? Letter C is the Abrari key for this Cellular respiration / Krebs cycle.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q63 · Cell biology / plant cells
Which one of the following is true about plant cells? They have
- A. Vacuole which controls all activities of the cell.
- B. Lysosomes which contain hydrolytic enzymes.
- C. chloroplast which is filled with sap, liquids and minerals.
- D. cell wall which gives support and strengthen to the cell.
Worked solutionUnofficial
Answer: D
Answer D: cell wall which gives support and strengthen to the cell.. The stem is: Which one of the following is true about plant cells? They have Letter D is the Abrari key for this Cell biology / plant cells.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q64 · Osmosis / plant cells
A plant cell is placed in a solution which has lower solute concentration than its contents. After a few minutes the cell will become
- A. turgid.
- B. flaccid.
- C. plasmolysed.
- D. burst.
Worked solutionUnofficial
Answer: A
Answer A: turgid.. The stem is: A plant cell is placed in a solution which has lower solute concentration than its contents. After a few minutes the cell will become Letter A is the Abrari key for this Osmosis / plant cells.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q71 · Enzymes / end-product inhibition
In a metabolic pathway, the end-product inhibition occurs when the
- A. last product of the pathway inhibits the last enzymatic reaction.
- B. first product of the pathway inhibits the last enzymatic reaction.
- C. first product of the pathway inhibits the third enzyme of the reaction.
- D. last product of the pathway inhibits the first enzymatic reaction.
Worked solutionUnofficial
Answer: D
Answer D: last product of the pathway inhibits the first enzymatic reaction.. The stem is: In a metabolic pathway, the end-product inhibition occurs when the Letter D is the Abrari key for this Enzymes / end-product inhibition.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q72 · Enzymes / graph interpretation
From the graph showing rate of catalase reaction at different substrate concentrations, we can conclude that catalase was functional with its minimum turnover rate from substrate concentration of
This item uses a figure in the original paper (not redrawn here).
- A. 0.4 to 0.5.
- B. 0.1 to 0.2.
- C. 0.5 to 0.6.
- D. 0.3 to 0.4.
Worked solutionUnofficial
No keyed letter is published for this item. No keyed letter is published for this 2015 E.C. natural item (Enzymes / graph interpretation). Image-dependent graph reading; cannot determine range without the graph.Try the options yourself, then practise the same subject timed in the app.
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2015 E.C. · natural · Q73 · Cell theory
Which one of the following statements is correct about the description of the cell theory?
- A. Schleiden and Schwann stated that all cells come from pre-existing cells.
- B. Virchow stated that cell is the unit of structure, physiology and organization of living things.
- C. Modern cell theory states that cells contain hereditary information that passes from cell to cell.
- D. Spontaneous generation theory states that all cells have basically different chemical composition.
Worked solutionUnofficial
Answer: C
Answer C: Modern cell theory states that cells contain hereditary information that passes from cell to cell.. The stem is: Which one of the following statements is correct about the description of the cell theory? Letter C is the Abrari key for this Cell theory.
📖 G9 Biology, Unit 3, §3.1, p. 53“The cell theory states that: 1. Living organisms are composed of one or more cells. 2. Cells are the smallest unit of life 3. Cells arise only by the division of a pre-existing cell.”
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2015 E.C. · natural · Q75 · Prokaryotic cells
Which of the following characteristics of cells is found only in prokaryotic cell?
- A. Division of labor within the cell
- B. Continuous loop of DNA
- C. 10 -100 μm long
- D. Higher level of complexity
Worked solutionUnofficial
Answer: B
Answer B: Continuous loop of DNA. The stem is: Which of the following characteristics of cells is found only in prokaryotic cell? Letter B is the Abrari key for this Prokaryotic cells.
📖 G9 Biology, Unit 3, §3.4, p. 60“Prokaryotic cells such as bacterial cells don’t have membrane-bound organelles or a nucleus.”
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q77 · Virology / HIV life cycle
Order the steps when HIV infects its host cell: (1) RNA to DNA & incorporation; (2) transcription & protein production; (3) assembly of new particles; (4) gp120 binds CD4; (5) fusion with plasma membrane; (6) release of RNA & reverse transcriptase. The logical order is:
- A. 4, 5, 6, 1, 2, 3.
- B. 4, 2, 5, 6, 1, 3.
- C. 4, 6, 5, 2, 1, 3.
- D. 4, 1, 2, 5, 6, 3.
Worked solutionUnofficial
Answer: A
Answer A: 4, 5, 6, 1, 2, 3.. The stem is: Order the steps when HIV infects its host cell: (1) RNA to DNA & incorporation; (2) transcription & protein production; (3) assembly of new particles; (4) gp120 binds CD4; (5) fusion with plasma membrane; (6) release of RNA & reverse transcriptase. The logical order is: Letter A is the Abrari key for this Virology / HIV life cycle.
Unofficial — solved by Abrari, not an official EAES key.
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2015 E.C. · natural · Q89 · Photosynthesis / Calvin cycle
During light independent reactions of photosynthesis, glucose is synthesized through
- A. synthesis of reduced NADP that provides hydrogen ion.
- B. six turns of the Calvin cycle to make one molecule of glucose.
- C. release of hydrogen ions at the electron transport chain.
- D. transmission of electrons to the inside of the thylakoid.
Worked solutionUnofficial
Answer: B
Answer B: six turns of the Calvin cycle to make one molecule of glucose.. The stem is: During light independent reactions of photosynthesis, glucose is synthesized through Letter B is the Abrari key for this Photosynthesis / Calvin cycle.
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