Welcome to your Biology national exam 2013
1.
Which one of the following is true about the importance of Lucy in resolving debates about human evolution?
2.
Which one of the following can best explain behavior? It is
3.
The quick withdrawal of your hand from a hot plate is an example of
4.
Which one of the following processes describes a biological clock?
5.
Identify learned behavior from the following.
6.
Which one of the following features is unique to bacteria?
7.
This item is based on the diagram which shows the different shape of Bactria below.
Which is the correct name of the shape of bacteria represented by letters A, B, and C respectively?
8.
It is possible to produce human insulin in a bacteria strain. The insulin gene should be inserted in a plasmid and the recombinant DNA plasmid should be inserted into a bacterium. What is the role of bacterium in this process?
9.
Bacteria can cause diseases in all of the following mechanisms EXCEPT
10.
Functional diseases differ from infection discuses in that they
11.
This item is based on the drawing of a bacteriophage given below.
In the above diagram of a bacteriophage DNA
and Protein coat are
respectively represented by
12.
The social impact of AIDS can he mainly revealed by
13.
Which one of the following is a DNA virus?
14.
Which one of the following is a correct comparison of lytic and lysogenic cycles of virus multiplication?
15.
In an HIV/AIDS community screening were asked to take part in voluntary testing. The following discussion presents the views of four grade 12 students named A, B, C and D towards HIV testing.
Students A: I should not take the testing; it is
simply boring.
Students B: We should take the testing, since
we are educated, we should be exemplary.
Student C: If we get tested and got positive, what should we do? So, lets us not get tested.
Student D: You know, this HIV/AIDS testing is
simply a business.
We should not be cheated. Which student do
you think is correct?
16.
Which event of cellular respiration takes place in the cytoplasm of eukaryotic cell?
17.
Suppose two moles of glucose is burned aerobically. How many moles of ATP can be produced by substrate level phosphorylation in Krebs cycle?
18.
During alcoholic fermentation, CO2 is released when
19.
During anaerobic respiration, reduced NAD is required to
20.
Why do we get tired and fatigued during exercise such as long distance running? It is due to
21.
If one base m the six triplets of the gene coding for one of the four polypeptides in the hemoglobin molecule alters the triplet from GAG to GTG, which one of the following biological terms best describes the above phenomenon?
22.
Which one of the following is the basic characteristic of mutation? It is
23.
The theory that suggests "Me can evolve autonomously from non- living objects" is known as
24.
Which one of the following is true about neo-Darwinian theory?
25.
Which one of the following statements describes the evolutionary theory of Lamarck?
26.
The behavior which trainers look, if modified, could lead to the desired behavior and reward such a behavior
27.
Which one of the following examples of behavior describes when a animal stops responding to stimulus or cue after a period of repeated exposure?
28.
A police man trained a dog on how to find explosive materials through sniffing; on another instant the same police man observed a week old puppy following him to the roadside. Which one of the following is correct about the behaviors of the animal in the observation?
29.
Which one of the following behavior is a courtship behavior?
30.
The Ethiopian wolf (Canis simensis) lives and hunt in packs. During patrolling their habit it, both male and female wolves of the group maintain their area with urine containing pheromone. This pattern of behavior best exemplifies.
31.
The terrestrial biome characterized by cold temperature, dry precipitation frozen soil and inhabited by migration birds is
32.
This item is based on the table below
Select the correct representatives for L, M, N and O, respectively
33.
Which one of the following explains biodiversity?
34.
This item is based on the table below shows which shows an invented ecosystems.
In which area of the above table does all of the species are more or less equally successful?
35.
A major factor in controlling the population size that helps to minimize predators and recover prey's number is
36.
What is the major difference that viruses have with free living cell? Viruses
37.
Why is nutrient recycling important in an environment? Because
38.
Which one of the following orders of life processes correctly illustrates occurrence of the nutrient cycle?
39.
Which of the following processes in the cycle DOES NOT return phosphate ions to the soil?
40.
A previously bare land was gradually occupied by lichen and mosses, annual herbs, perennial herbs, shrubs and finally by forests. Which one of the following best describes the process indicated above?
41.
The item is based on the table below.
The population number of , and , respectively
42.
This item is based on the table below which shows population growth trend.
Which one of the following is correct about X
And Y?
43.
Drosophila melanogaster are convenient experimental animals in genetics. Because they
44.
Suppose a heterozygous brown eye father is married with a blue eye mother. What would be the proportion of homozygous children for eye color? (Hint: Brown is dominant over blue)
45.
the following question is based on the figure that shows the gains in productivity from hybrid vigor
In the above diagram, what best describes the breeding condition represented by letter X, and Z, respectively?
46.
If organisms share very similar molecules such as DNA, then they must be closely related evolutionary. Which evidence of evolution supports the above information?
47.
Which one of the following CANNOT be used as an evidence of evolution through paleontology?
49.
The process in which individuals with a particular heritable trait survive better than the other is
50.
Which type of selection favors individuals at both extremes of a range to have same advantage over those displaying the mean value?
51.
Which one of the following is true about the human evolution?
52.
Which one of the following is true organic molecules is used to make hemoglobin?
53.
Which one of the following is the correct formula of maltose?
54.
A grade 11 student added Benedict s reagent on food sample and heated the mixture for 5 minutes. Then he observed a color change. Which one of the following is FALSE about the result?
55.
In a Benedict's test for sucrose, why does the test sample first boil with hydrochloric acid?
56.
Which one of the following statements explains the specificity of enzymes? Enzymes
57.
The relevance and promise of biological sciences can be demonstrated by their contribution in
58.
All are the roles of biology to combat the spread of HIV/AIDS EXCEPT
59.
Which one of the following statements is INCORRECT about AIDS? The rate of transmission of AIDS will reduce when
60.
Which one of the following statements explains the property of water? It
61.
Suppose there are two communities in a village. Community A is actively participate in HIV/AIDS awareness creation, HIV prevention and got blood test for HIV whereas community B is frequently request for food aid, participate only in afforestation activities and HIV positive individuals keep the secret to themselves. In which community do you think that the incidence of HIV/AIDS most probably high?
62.
Which property of water is useful for life that it continues in relatively warm water underneath through the cold weather?
63.
Consider the following table which contains organic and inorganic molecules.
Which rows contain the corresponding organic and inorganic molecules correctly?
65.
Which organic molecules are formed when two fatty acid molecules are bounded to the glycerol and the place of the third is taken by a phosphate group?
66.
All are the function of lipids EXCEPT
67.
Three different cells are in the process of transporting materials
across the cell membrane as indicated below
Cell 1-water from high concentration to low
concentration
Cell 2-Nat from high concentration to low
concentration
Cell 3-glucose from low concentration to high concentration
Which types of transport mechanism do the
above cells use, respectively?
68.
Suppose you took a container and divided it into two halves by a membrane which is permeable to water and labeled the two halves as A in B Finally, you added hypertonic solution in A and hypotonic solution in B What will be the expected result of this experiment?
69.
According to the fluid-mosaic model of the plasma membrane
70.
A class of grade 11 students were given two solutions A and B of unknown concentration separated by a semi permeable membrane. The teacher instructed them to observe any changes in the water levels of the two solutions. After few minutes, the students observed the water level in solution A has decrease What could the students conclude from their observationA class of grade 11 students were given two solutions A and B of unknown concentration separated by a semi permeable membrane. The teacher instructed them to observe any changes in the water levels of the two solutions. After few minutes, the students observed the water level in solution A has decrease What could the students conclude from their observation
71.
A student did an experiment and found out that catabolism of amino acid produces toxic ammonia in the liver cells which gradually get converted into urea and excreted through urine. What would be the result of the experiment if osmosis was blocked? The liver cells
72.
Consider the following key events in the study of cell biology. 1 Hooke describes 'cells' in a cork. II Leeuwenhoek discovers protozoa III. Schleiden and Schwann propose a cell A theory .IV . Jansen builds the first compound microscope.
73.
One of the differences of prokaryotic and eukaryotic cells is their cell wall. This is because cell wall of prokaryotic cell is
74.
Consider the following features of cells.
I Have pili
II have chromosome
III. have circular DNA
IV. have larger ribosomes
Which of the following features of cells can
be included in eukaryotic cells?
75.
Which of the following is correct about the structure of the cell membrane?
76.
Which of the following is a correct match of cellular organelles and their corresponding function?
77.
What structural arrangements make chlorophyll suit for its function?
78.
Why does photorespiration take place in a hot environment? Because plants close their stomata and face
79.
This item is based on the diagram of chloroplast given below.
Which letters represents the site where photolysis and Calvin take place respectively?
80.
Which of the following is correct about the process of glucose production in the light-independent reactions of photosynthesis?
81.
Which of the following is a correct description of the CAM pathway of photosynthesis?
82.
Which one of the following statements explains how an enzyme lowers the activation energy of a reaction? BY
83.
Consider the following chemical reaction below
RH 2+A E R -l-A H 2
Based on the above chemical reaction, in which classes of enzymes does enzyme "E" can be grouped?
84.
Which one of the following enzymes is used is used as washing powders?
85.
What happens when the substrate molecule binds to the active site of an enzyme?
86.
Which of the following vitamins is used as component of cofactor?
87.
How does crossing over during meiosis bring variation in species? By
88.
How does our body synthesize some of the amino acids in our body? from
89.
This item is based on the following list of events during cloning of an insulin gene into plasmid
1. Obtaining insulin producing cells and plasmid from organism
II. Cutting the insulin gene and plasmid
III. x
IV. Inserting the recombinant plasmid into
bacteria
V. Production of insulin by bacteria
Which one of the following best represents the step listed as "X"?
90.
Consider the DNA molecule containing:
Strand 1: TACGTA
Strand 2: ATGCAT
What will be the sequence of the new DNA if
the DNA replicates semi-conservation?
91.
During translation the
92.
The step of scientific method which comes after analyzing results and draw conclusion is
93.
In a group of individuals in which group A was a control and group B was an experimental group, a student have a placebo to the control group, and an unknown drug to the experimental group. At the end, the experimental group go better. Which one of the following is true about the result?
94.
A biologist conducted simple experiment to investigate the effect of pH on salivary amylase. She added 5cm' amylase solution into Sam starch suspension with a neutral pH in a test tube. After ten minutes, she tested it with iodine reagent and the solution turned into blue black color. What is the dependent variable of this experiment?
95.
Which one of the following pairs to biological tools and their functions is FALSE?
96.
Grade 12 students went to a field and collected plant specimens for identification in the laboratory. They wanted to preserve the plant parts for some times and specimens can be analyzed later. Which one of the following biological tool is used for their activities?
97.
Some amino acids are synthesized using transamination process in the cell. This activity more describes the cell's
98.
Identify the statement that correctly explains the factors of an enzymes activity.
99.
Which one of the following is true about allosteric regulation?
100.
If an enzyme from thermophilic bacteria, which catalyses’ glucose 6phosphate into fructose 6-phosphate in the process of glycolysis, is subjected to below the optimum temperature, the rate of reaction will be decreased. This is because
