Biology EUEE 2004 E.C
Grade 11
Unit One
- Which of the following statements is in agreement with the modern cel theory?
- Cells come from nothing. C. Cells come from non-living material.
- Cells come from existing cells. D. Cells arise by means of spontaneous generation.
- Which of the following corresponds to the beginning step of a scientific work?
- Testing hypotheses C. Conducting observations
- Making observations D. Drawing conclusions
- In an experiment that is testing the effect of temperature on the germination rate of certain seeds, in which one of the following should the experimental and the control groups differ?
- The amount of water they receive. C. The number of seeds assigned to them.
- The age of the seeds assigned to them. D. The temperature at which they are kept.
- What is the term for the process by which organisms keep their internal conditions at a fairly constant state?
- Catabolism B. Evolution C. Homeostasis D. Photosynthesis
- Which of the following is NOT in agreement with the scientific method?
- Putting forward testable hypotheses. C. Putting forward personal value judgments.
- Carrying out experiments in duplicates. D. Analyzing results and drawing conclusions
- A cell was examined under a compound light microscope with an eyepiece lens marked 13x and an objective lens marked 40x. How many times larger would the cell appear to the viewer?
- 40 times. B. 53 times C. 400 times D. 520 times
- In an experiment designed to test the effect of different concentrations of a fertilizer on the growth rate of a plant, which one of the following is the dependent variable?
- The growth rate of the plant. C. Concentrations of the fertilizer applied.
- Plants assigned to the control group. D. Plants assigned to the experimental group.
- A biologist applied the scientific method repeatedly, gathered a large amount of supporting experimental data and finally described a pattern or relationship between different factors. What is the best term refers to facts established in this way?
- Theory B. Hypothesis C. predication D. Law
Biology EUEE 2005 E.C
Grade 11
Unit One
- Which of the following steps in the scientific method comes following observation?
- Prediction B. Hypothesis C. Experiment D. Theory
- Which unit is best to use for measuring the smallest cells and organelles?
- Micrometre B. Millilitre C. Millimetre D. Nanometre
- Choose the one that is NOT a requirement of all living things.
- Ability to thin C. Response to the stimuli
- Organization of parts D. Maintenance of internal constancy
- One of the following would be harder to see under the ordinary light microscope that is more likely to be available in school laboratories.
- Nucleus B. A bacterium C. A mitochondrion D. A ribosome
- Which of the following is a recently developed active area of research in biology today?
- Taxonomic study C. Ecological research
- Study about the cell theory D. Stem cell research
Biology EUEE 2007 E.C
Grade 11
Unit One
- Which of the following step of the scientific method comes before all the rest?
A. Hypothesis B. Experiment C. Conclusion D. Reporting the result
- In scientific method, what is the importance of a background research for a given problem?
- To formulate a hypothesis C. To prepare report of the result
- To make a prediction D. To make a conclusion
- Which of the following factors determines the rate at which organelles settle out of cell homogenate if spun in a centrifuge?
- Mass of the organelle.
- Function of the organelle in the cell.
- Location of the organelle in the cell.
- Thickness of the membrane covering the organelle.
- What is the ultimate source of all scientific knowledge?
- Observation C. Trial and error
- Guessing D. Observation and experimentation
- What did Francesco Redi prove through his scientific experiment?
- Maggots appear spontaneously on food placed anywhere.
- Maggots do not appear in foods kept in jars that are protected with a cover.
- Maggots do not appear in foods kept in open jars.
- Flies appear spontaneously on rooting meat kept in closed or open jars alike.
- What does an ethologist study?
- Insect diets B. Soil types C. Fossil fuel D. Animal behavior
- What do you call the reasoning technique in science where general principles are used to analyze specific cases?
- Induction B. Deduction C. Pseudo-deduction D.Pseudo-induction
- Choose the step that comes at the last step in the scientific method.
- Proposing the research hypothesis C. Conducting experiments
- Formulation of a scientific theory D. Making predictions
- Which of the following is a worthwhile biological problem for scientific investigation?
- Estimation of the amount of carbon in a forest ecosystem.
- How a crying dog can tell who among elders of the village is going to die next
- How witchcrafts inflict bad health by cursing a healthy person
- How the traditional medicine men/women cure a possessed person.
Biology EUEE 2008 E.C
Grade 11
Unit One
1.Which of the following laboratory glassware is used for culturing bacteria ?
A. petri dish B. Test tube C. filter paper D. Measuring cylinder
2.Which of the following is the correct sequence of the steps in scientific research ?
A. Hypothesis formulation Conclusion experiment question
B. Question hypothesis formulation experiment conclusion
C. Hypothesis formulation question experiment conclusion
D. Question hypothesis formulation conclusion experiment
3.For what purpose do biologist use the GPS receiver ?
A.To produce area maps C. To estimate tree ages
B. To measure tree heights D. To count tree rings
4.In an experiment designed to study the effect of temperature on the rate of seed germination, which of the following should the experimenter vary ?
A.Seed number B. Water quality C. Temperature D. Seed size
5.Which of the folliwng is the major mechanism by which AIDS is transmitted ?
A.Mother to fetal transmission C. Homosexual intercourse
B. Heterosexual intercourse D. Contaminated blood transfusion
6.Which of the following types of microscopes is most suitable for a detailed study of the surface structure of an object?
A.Field microscope C. Scanning electron microscope
B. Optical microscope D. Dissecting microscope
7.Which of the following is consistent with science ?
A. Proof by investigation of the causes of a phenomenon C. Proof by reference to an unknown object
B. proof by reference to a respected leader D. Proof based on lessons from a person one believes
8.In which of the following are all the tools mainly used in the laboratory rather than in field situation ?
A.Centrifuges, microscopes, measuring cylinders , petri dishes
B. Flow meters, centrifuges, theodolites, microscopes
C. Centrifuges, plant presses, flow meters, microscopes
D. Theodolites, petri dishes, GPS receivers, measuring cylinders
Biology EUEE 2004 E.C
Grade 11
Unit Two
- Which group of organisms has a system of protein synthesis in which transcription and translation take place at separate times?
- In all eukaryotic organisms. C. Only in prokaryotic organisms.
- In multicellular animals only. D. In both prokaryotic and eukaryotic organisms.
- How many different kinds of amino acids are there for protein synthesis?
- Twenty B. Twenty – four C. Twenty – six D. Thirty – two
- How many carbon atoms are contained in a single molecule of sucrose?
- 6 B. 12 C. 24 D. 48
- In the process of amino acid condensation, which one of the following happens?
- Oxygen is used up. C. Water is released as a byproduct.
- Carbon dioxide is released. D. Protein is broken down into amino acids.
- Which of the following pairs of elements are found in all carbohydrates in addition to the element carbon?
- Nitrogen and oxygen. C. Hydrogen and nitrogen.
- Hydrogen and oxygen. D. phosphorus and nitrogen.
- Among the molecules found in cells, which of the following contains less energy?
- A glucose molecule C. A triglycerids
- An amino acid D. A water molecule
- In which one of their structural parts do different molecules of amino acids differ from one another?
- In their R group. C. In their carboxyl group.
- In their amino group. D. In their alpha – carbon group.
- If one mixes a sample of a fruit juice and some drops of Benedic’ts solution and obtains a brick – red precipitate up on warming the mixture, what does the juice contain?
- Starch B. Reducing sugar C. Sucrose D. Protein
Biology EUEE 2005 E.C
Grade 11
Unit Two
- The main component of the plant cell wall is ___________ ?
- Starch B. Cellulose C. protein D. Chitin
- All proteins contain carbon, hydrogen, oxygen and what other element?
- Chlorine B. Flourine C. Nitrogen D. Sulphur
- How many carbon atoms are there in one disaccharide molecule?
- 6 B. 12 C. 18 D. 24
- What is the name of the sugar found in milk?
- Glucose B. Lactose C. Maltose D. Sucrose
- What can one conclude about the contents of the foodstuff if a mixture of Benedict solution and a foodstuff remain blue after heating?
- It contains proteins. C. It contains fats
- It lacks starch D. It lacks reducing sugar
- Which of the following groups of substances are all inorganic?
- Water, sugar, calcium, carbonate C. Water, calcium carbonate, carbon dioxide
- Sugar, fatty acid, amino acid D. Carbon dioxide, amino acid, fatty acid
- In which of the following compounds are both members of the pair are polymers of carbohydrates that naturally occur in plants only?
- Starch and chitin C. Glycogen and cellulose
- Starch and cellulose D. Glycogen and chitin
- Which of the following is generally expected to give better health benefits when present in human diet?
- Animal fat C. Monounsaturated fatty acid
- Saturated fatty acid D. Polyunsaturated fatty acid
- Suppose the amino acid coding region in a mRNA is 1200 nucleotides long, how long is the protein in terms of amino acid number?
- 1200 amino acids C. 400 amino acids
- 600 amino acids D. 300 amino acids
Biology EUEE 2006 E.C
Grade 11
Unit Two
- To which one of the following organic molecules do enzymes belong?
- Carbohydrates B. Amino acids C. Proteins D. Lipids
- A carbohydrate compound is known to have 12 carbon atoms in the whole molecule. What could this compound be?
- A polypeptide B. A disaccharide C. A monosaccharide D. A polysaccharide
- If certain food stuff gave a positive result with Benedict’s test only after it was hydrolyzed with hydrochloric acid, which of the following substances could it be?
- Non-reducing sugar C. Lipid
- Nucleic acid D. Protein
- Which of the following molecules is NOT a polymer?
- Protein B. Lipid C. RNA D. Starch
- At which level of structural organization do proteins have the alpha-helix shape?
- Primary structure C. Tertiary structure
- Secondary structure D. Quaternary structure
- Which element is found in nucleic acids?
- Calcium B. Iron C. Magnesium D. Phosphorus
- What is the base found in RNA in place of thymine of DNA?
- Cytosine B. Guanine C. Thymine D. Uralic
- What does a restriction enzyme do?
- Restricts transcription C. Prevents DNA from replicating
- Cuts DNA at specific sites D. Hydrolyzes the DNA molecule
- Which are the four most abundant elements in living cells?
- Carbon, oxygen, sulfur, phosphorus.
- Carbon, oxygen, hydrogen, nitrogen,
- Carbon, oxygen, nitrogen, sulfur.
- Carbon, oxygen, sulfur, magnesium
- Which of the following is an inorganic molecule?
- CaCO3 B. CH4 C. C6H22O11 D. C18H36O2
- In the formation of a macromolecule, what type of reaction would join two subunits together?
- Hydrolysis reaction C. Denturation reaction
- Dehydration reaction D. Hydrophobic reaction
- To which group of organic compounds do the triglycerides and waxes belong?
- Carbohydrates B. Proteins C. Lipids D. Vitamins
- Which of the following is true about all proteins?
- They are twenty amino acids long.
- They are globular in shape.
- They perform the same function.
- The monomers are held together by peptide bonds.
- Which of the properties of water allows mosquito larvae to hung themselves dawn into the water from the water surface?
- Its high specific heat capacity
- Its high latent heat of vaporization
- Its high surface tension
- Its low density in solid state
- Which two nitrogenous bases belong to the purines?
- Adenine and thymine C. Guanine and cytosine
- Adenine and guanine D. Thymine and uracil
- Which one of the following is a functional group of a fatty acid?
- A ketone group C. An amino group
- An aldehyde group D. A carboxyl group
Biology EUEE 2008 E.C
Grade 11
Unit Two
1.Of the following functions, which one do triglycerides accomplish in cells?
A. Increase density of tissues and cells C. Yield limited amount of ATP for cells
B. Increase thermal insulation of cells D .Facilitate entry of excess water in to cells
2.How many fatty acids would a cell need to form a molecule of triglyceride ?
A.Two B.Four C. Five D. Three
3.Which of the following food types would most likely give a negative result upon addition of iodine solution ?
A.Bread B. Butter C. Biscuit D. Potato
4.Which of the following molecules can serve as a raw material for industries that produce glucose ?
A.Nucleicacids B. Proteins C. Lipids D. Starch
5.Which of the following classes of fatty acids is without carbon-carbon double bond ?
A.Monounsaturated fatty acids C. Saturated fatty acids
B. Unsaturated fatty acids D. Polyunsaturated fatty acids
6.Why does sucrose give a negative result when mixed and heated with Benedict’s Solution ?
A.Because it is not a sugar molecule C. Because it is a non-reducing sugar.
B. Because it is a reducing sugar D. Because it is not a monosaccharide
Biology EUEE 2004 E.C
Grade 11
Unit Three
- What do we call the substance upon which and enzyme acts?
- Product C. Activation energy
- Substrate D. Enzyme – substrate complex
- Which factor has a more negative effect on the functions of enzymes than the others?
- Neutral pH. C. Optimal amount of salt concentration.
- Very high temperature. D. optimal amount of substrate concentration
- In which one of the following points does the induced – fit model of enzyme action differ from the lock – and – key model?
- Enzymes lower the energy of activation.
- Substrate bind at the active site of the enzyme.
- During the reaction, and enzyme – substrate complex is formed.
- The shapes of the substrate and active site are complementary.
- Which of the following mechanisms do cells use to regulate enzyme catalyzed reactions in metabolic pathways?
- Enzyme denaturation. C. End product inhibition.
- Irreversible inhibition. D. Competitive inhibition.
- When an enzyme is denatured by heat or extreme pH, which one of the following does it lose?
- The peptide bond. C. Secondary structure
- Primary structure. D. Tertiary structure.
- In competitive inhibition, which one of the following factors determines the rate of the inhibition?
- The reaction temperature. C. The substrate concentration.
- The enzyme concentration D. The ratio of inhibitor to enzyme concentration.
- Suppose 25% of the molecules of an enzyme are inhibited by a non – competitive inhibitor, which one of the following would happen if the amount of the substrate is increased by 50%?
- The reaction rate would double .
- More enzyme molecules would get inhibited.
- The rate of the reaction would decrease by 50%
- The rate of the reaction would remain unchanged.
- What are the environmental advantages of using enzymes in industry?
- It makes high production possible with less input of heat.
- It makes high production possible with high input of heat.
- It makes high production possible with emission of more CO2.
- It helps high production with supply of more heat and emission of more CO2.
Biology EUEE 2005 E.C
Grade 11
Unit Three
- One of the following molecules is the building units of an enzyme molecule.
- Amino acids B. Glucose C. Nucleotides D. Fatty acids
- Which of the following classes of enzymes digests carbohydrates?
- Amylases B. Lipases C. Proteases D. Nucleases
- Which of the following Paris of molecules are known to have catalytic activity?
- Lipids and proteins C. Proteins and RNAs
- Carbohydrate and proteins D. proteins and DNAs
- To which class of enzymes do the digestive enzymes belong?
- Esterases B. Transferases C. Hydrolases D. Isomerases
- Which of the following types of enzyme inhibitions can be removed when the end product of the metabolic pathway is deplected?
- Allostreric inhibition C. Competitive inhibition
- Non – reversible inhibition D. Reversible competitive inhibition
Biology EUEE 2007 E.C
Grade 11
Unit Three
- Which of the following is a coenzyme?
- NAD B. Carbohydrate C. Water molecule D. Protein
- Which of the following substances has a shape which is similar to that of the substrate of an enzyme?
- The reaction product C. A cofactor
- A competitive inhibitor D. An allosteric inhibitor
- Which one of the following terms refers to have fast an enzyme acts on its substrate?
- Turn over number C. Enzyme number
- Substrate number D. Product number
- The optimum temperature of enzymes found in thermophilic bacteria is:
- Lower than for enzymes in the human body.
- Higher than enzymes in the human body.
- The same as enzymes found in human body.
- Lower than enzymes found in warm blooded animals.
- The most complex structure of proteins is called
- Primary structure C. Tertiary structure
- Secondary structure D. Quaternary structure
- Which of the following properties of enzymes makes it possible that a single enzyme molecule can act on many substrate molecules?
- Enzymes are proteins
- Enzymes lower the energy of activation
- Enzymes are resued over and over again
- Enzymes are substrate specific
- If the ratio of an enzyme catalyzed reaction remains constant even when more substrate is added to the reaction, which of the following might be the reason?
- Saturation of the enzyme
- Inactivation of the enzyme
- Inhibition of enzyme-substrate complex formation
- Loss of substrate specificity by the enzyme
