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21) which of the following explain how an enzyme lowers the activation of energy of reaction? By:- A)making the individual substrate molecule more reactive B) enabling the reaction to occur at lower physiological temperature? C) changing its tertiary structure into secondary protein structure D) lowering the activation energy of the reacting molecules. Answer B 22)what happen when the substrate molecule binds to the active site of an enzyme? A)they form stable intermediate substance B)the substrate and the enzyme will bond permanently C)the chemical bonds of the substrate distorted D)the amino acid in the active site become unreactive Answer C 23)which one of the following behaviors is a courtship behavior? A) scent marking B) Touch C) defending a den D) ritual fighting Answer B 24) which one of the following examples of behavior describe when an animal stops responding to stimulus or cue after a period of repeated exposure? A)reflex B) imprinting C) conditioning D) Habituation Answer D 25)the Ethiopian wolf (canis simensis) lives and hunt in packs. During patrolling their habitat both male and female wolves of the group maintain their area with their urine containing pheromones. This pattern of behavior best exemplifies A) Territorial behavior B) courtship behavior C) learned behavior D) operant behavior Answer A 26)the behavior which Trainor look, If modified could lead to the desired behavior and reaward such a behavior is A) instinct B)innate C) operant D) Reflex Answer C 27) identify learned behavior from the following A) honey bee making honey B)dog trained to hunt C)Ants making nests D)child withdraw hand from hot things Answer B 28)which one of the following process describe a biological clock? A)the growing of plants towards light B)removal of one one's thumb from hot objects quickly C) kinesis and taxes of woodlice and other simple animals D) circannual migration of birds from temperate to tropical areas. Answer D 29)the quick withdrawal of your bad from hotplate is an example of A)innate behaviors B)fixed action pattern C)key stimulus D) Biological clock Answer A 30)which types of selection favor individual at both extreme of range to have some advantage over those displaying the mean value A)Directional selection B) stabilizing selection C) disruptive selection D) Natural selection Answer C 31)the process in which individuals with a particular heritable trait survive better than the other is A) evolution B)Adaption C) natural selection D) selective breeding Answer C

9)Which property of water is useful for life that it continues in relatively warm water underneath through the Cold weather? A) high density in its solid form than its liquid form B)high specific heat capacity C) high latent heat of vaporization D)high surface tension Answer B 10) which one of the following statements explains the property of water? It A)has the lowest latent heat of vaporization B)takes less energy to heat water up. C)is highly viscous substance D)is a transparent molecule Answer D 11) cellulose A)a polymer of Beta-glucose molecule B)a mixture of amylose and amylopectin C)a polymer of Alpha glucose molecule D)a non-reducing monosaccharides sugar Answer A 12) which organic molecules are formed when two fatty acid molecule are bounded to the glycerol and the place of the third is taken by a phosphate group? A) glycolipids B)Waxes C) phospholipid D) triglycerides Answer C 13)All are the functions of lipids except A) water proofing B) thermal insulation C) determine a particular feature D) respiratory substrate Answer C 14) which of the following organic molecules is used to make haemoglobin A) lipids B) glycogen C) nucleic acid. D) protein Answer D 15) which of the following is the correct formula of maltose? A)C¹²H²⁴O¹² B)C⁶H¹²O⁶ C)C¹²H²²O¹¹ D)C⁵H¹⁰O⁵ Answer C 16)in Benedict's test for sucrose why does the test sample first boil with hydrochloric acid? A)to neutralize the solution B)to reduce the Benedict's solution C)to rest the mixture with Benedict's solution D)to hydrolyze non-reducing sugar Answer D 17) which one of the following statements explains the specificity of enzymes? Enzymes.. A) speed up the reaction without being used up B) catalyze on reaction only C)can be used over and over again D)can be destroyed by excessive heat Answer B 18) which one of the following enzymes are used as washing powder?. A) lipase B)biochymosin C) pectinase D) cellulose Answer. A 19) which one of the following vitamin is used as component of cofactor? A) Riboflavin B)thiamin C)Retinol D)Abscorbic acid Answer A 20) some Amino acids are synthesized using transamination process in the cell. This activity more describe the cell's.. A) Catabolism B) replication C) anabolism D) energy production Answer C

Last year entrance exam! Biology From Unit 1 grade 11 and 12 1)the step of scientific method which comes after analyzing results and draw conclusion is A) constructing hypothesis B) doing background research C) Accepting or rejecting the hypothesis D) designing and carrying out the experiment. Answer C Here is the correct order of scientific method. 👉Ask questions 👉Do background research 👉 construct hypothesis 👉 design and Carry out the experiment 👉analyze result and draw conclusion 👉 Accept or reject the hypothesis 👉Report the results 2) which of the following is incorrect about AIDS? The rate of transmission of AIDS will reduce when A) promiscuous sexual intercourse is reduced B) the transmission pathway is reduced. C)men and women are circumcised D)the number of sexual partners is restricted. answer C why? While men circumcision has health benefit female circumcision is as a harmful practice and doesn't reduce the rate of transmission. Akka ifa isinii ta'uuf Kan yoo kittanaame faayidaa qabu dhiira malee shamaraa miti. Shamarran kittaanuun HIV hin hir'isu. 3)all are the role of biology to combat the spread of HIV/AIDS.except A) breaking the transmission pathway. B) producing drug that can stop the virus from reproducing. C) producing vaccine against the virus D) raising fund for infected people Answer D. Why? Because raising fund is not the role of biology! 4)the relevance and promise of biological science can be demonstrated by their contribution in:- A)finding solution to ethnic conflict. B) finding mechanism to feed the growing human population. C) advancement of aviation technology. D) raising fund for infected people. Answer B 5) Grade 12 student went to a field and collected to a plant specimens for identification in the laboratory.they wants to preserve the plant parts for sometimes and specimen can be analyzed later.which one of the following biological tools is used their activities. A)Pitfall traps B) Plant press C) Quadrat D) Theodolite Answer B 6) which one of the following biological tools and their functions are FALSE? A) Balance= used for measuring mass B) Petridish= uses for culturing micro organism C) Optical microscope=use beam is light to produce magnified image D) Quadrat =to separate solid from liquid. Answer D why? Quadrant is used in ecology to isolate a sample to study the distribution of vegetation or animals with in the marked area. 7)in group of individual in which group A was a control and group B was an experimental group, students gave a placebo to the control group and uknown drug to the experimental group. at the end the experimental group got better. which of the following is true about the result? A)Placebo has better effect B)The drug has an effect C)Conclusion cannot be reached. D)The experiment was wrong. Answer .B 8) biologist conducted simple experimentto investigate the effect of pH on salivary amylase. She added 5cm³ amylase solution in to 5cm³ starch suspension with a netural pH in a test tube.after ten minute she tested it with iodine reagent and the solution turned into blue black color. What is the dependant variable of this experiment? A)pH of the solution. B) applying iodine treatment. C) formation of blue black color. D) Adding salivary amylase. Answer A why? The dependant variable is the variable that is measured during an experiment in response to the change in independent variable.

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