Welcome to your BIOLOGY 2015
Choose the best answer from the given alternatives
1.
Sickle cell anemia is caused by the replacement of glutamic acid by Va line at a specific position in the beta chains or hemoglobin. This change is an example of which mutation ?
2.
Stanley miller conducted spark discharge experiment by taking a mixture of gases that he thought to represent the primitive atmosphere of the Earth. All of the following were found in his gas mixture EXCEPT
3.
Which one of the following sentences explains the Darwin theory of evolution?
4.
Comparative anatomy provides evidence of evolution because it
5.
About 3 million years ago the isthmus of panama separated the shrimp population of the Caribbean sea and created two populations of shrimps, one on either side of the isthmus. They still look remarkably similar, but they do not interbreed with each other. Which type of isolation is described by this scenario?
6.
Which one of the following sentences is true about viruses?
7.
The following steps are involved when HIV infects its host cell in the human body.
1 Conversion of viral RNA into DNA and its incorporation into cell's DNA
2 Viral DNA's transcription into viral RNA and production of proteins
3 Assemblage of new viral particles from RNA, proteins and Reverse Transcriptase
4 The binding of gp 120 of HIV to CD4 Of a T
Lymphocyte
5 fusion of HIV with the plasma membrane of the host cell
6 Release of its RNA and reverse transcriptase
into the cell
The logical order of the steps listed above would be
8.
Which one of the bacteria produces ammonium ion by forming a symbiotic association with peas and beans ?
9.
Which one of the following comparisons is true about primary and secondary successions? Secondary succession has
10.
Which one of the following NOT the function of the liver?
11.
What will happen if an agriculture extension worker injects gibberellins into a dwarf plant? The
12.
This item is based on the following diagram which depicts the water cycle.
In the above diagram, the letters A, B,C andD respectively represent
13.
Which of the following leaf structure is correctly matched with its function
14.
Which one of the following statements correctly describes the movement of materials in plants?
15.
A biologist collected two types of seeds (SA and SB) from the field and sowed them in moist soils enriched with nutrients. Then, he recorded his observations as follows :
SA
The seedling of this seed emerged from the soil curved while pushing up through the soil.
The hypocotyl straightened and carried the cotyledons and plumule above the soil surface.
SB
The plumule of the seedling pushed its way out of the soil, while the cotyledon remained underground.
Unlike what occurred during the germination of SA, the plumule of this seed did not form a hook.
Which one of the following is correct about the observations of the biologist?
16.
Which one of the following monohybrid crosses can be a test cross?
17.
Which of the following is different from the rest with regard to conservation of vegetation?
18.
In the nervous coordination system, which of the following statements explains the synapse ? It is a
19.
Two students want to demonstrate a simple spinal reflex action using the knee jerk reflex. One of them sits down with one leg loosely crossed over the other. The other hits the crossed leg just below the knee cap gently but firmly using the edge of his hand. Which one of the following situations will happen during this demonstration? The
20.
Which one of the following eye structures is correctly matched with its function?
21.
Which of the following enzymes is correctly matched to the food stuffs
22.
Which one of the following structures of the heart is correctly matched with its function?
23.
Suppose your friend fails suddenly due to heart attack while he is playing football. The victim needs artificial breathing to keep him a live until medical support arrives. Which activity is strictly prohibited in this situation?
24.
Consider the following figure which demonstrates air movements during breathing using the bell - jar model representing the lung.
Which of the following breathing movements happens when air enters into and exists from the balloon lungs ?
25.
Which one of the following sentences correctly describes the properties of water? It
26.
In animal cells, glycogen is hydrolyzed quickly to release glucose for respiration. This is due to the presence of several
27.
Consider the following diagram showing blood circulation system in the human body.
In the above diagram, the parts indicated by numbers 1, 2, 3 and 4 , are respectively
28.
A zoologist studied S vertebrate species t spA, spB, spC, spD and spE ) and described their features as follows.
spA : Smooth moist skin; pass parts of their lives in water and on land
spB : Streamlined bodies with scales; gills for gaseous exchange
spC : Feathers over the body and scales on legs; endothermic; horny beak
spD : Dry skin with scales; ectothermic; lungs for respiration
spE : Mammary glands; endothermic; higher internal body temperature based on the features listed above, spA, spB, spC, spD and spE can be classified under the vertebrate classes, respectively
29.
A student has conducted and Experiment using different enzymes to assess the enhancement of reaction rates under different conditions. She represents her result as indicated in the following table.
which one of the following is an acceptable conclusion of the aperiment?
30.
An organic molecule which is an important part of structure of chromosome is
31.
This item is based on the following diagram which depicts structural formula of a biological molecule.
The molecule represented by the above structure is
32.
Which one of the following phyla is characterized by a flexible cartilag. inous rod - like structure, that runs along the dorsal side of the body?
33.
Which one of the following groups of organisms is correctly matched with its phylum?
34.
Which one of the following events happens during carbon cycle? carbon dioxide is
35.
The carbon in organic compounds transferred from plants to animals by their feeding relation ship. adapt in the desert environment?
36.
Which one of the following sentences explains the traditional use of biotechnology ? production of
37.
Which one of the following sentences is correct about mitosis? It
38.
Consider the following diagram demonstrating the pyramid of energy.
Which of the following is INCORRECT about the pyramid of energy
39.
A cross between pea plants having heterozygous genotype (Rr) has been made. Which of the following is correct about the offspring according to the Mendelian inheritance? The probability of getting
40.
Which one of the following is correct about DNA ? It is
41.
What is the function of dermis of the skin? It
42.
Children who play by spinning round and round fast, when they stop, they feel dizzy. Why?
43.
When does menstruation start in women with no obviouswer : B a health problem ? It happens when
44.
Which one of the following sentences is correctly matched with the function of kidney structures?
45.
Which of the following temperature controlling mechanisms in hmoiotherms is categorized into behavioral method?
46.
Which one of the following sentences is correct about the heart?
47.
During culturing micro - organisms, all of the following activities are important, EXCEPT
48.
Which one of the following diseases can he caused by more than one type of micro organisms ?
49.
Which one of the following diseases is correctly explained with its causes or symptoms?
50.
The names of which two taxa are used in binomial nomenclature?
51.
In the CAM photosynthetic pathway
52.
In gram staining, if some bacteria retain the crystal violet after counter staining, then the bacteria is
53.
Which one of the following sentences describes a virus? It
54.
Which one of the following sentences explains the mechanism of bacterium to produce disease?
55.
Which one of the following sentences explains the role of bacteria ^ genetic engineering ? They are used to
56.
Which of the following processes takes place when lactate is produced?
57.
Which one of the following structures of the photo system is correctly related with its function?
58.
What happens during the electron transport system of respiration? The
59.
During light independent reactions of photosynthesis, glucose is synthesized through
60.
Which one of the following factors of photosynthesis is correctly matched with its effect?
61.
In a metabolic pathway, the end product inhibition occurs when the
62.
The following graph shows the rate of reaction of catalase enzyme at a constant temperature and at different substrate concentration (in
from the above graph, we can conclude that catalase was functional with its minimum turnover rate from substrate concentration of
63.
Which one of the following statements is correct about the description of the cell theory?
64.
A student measured the diameter of onion epidermal cells at a magnification of 100 X using a field of view adjusted to 2 mm by stage micrometer. What would be the diameter of individual cells if 8 cells fit into the field of view of the microscope at 100 X magnification?
65.
Which one of the following characteristics of cells is found only in prokaryotic cell?
66.
One of the following renowned Ethiopian biologists has developed a vaccine for the rinderpest disease
67.
A grade nine student has planned to study animal cells using a compound light microscope. She prepared a slide of stained human cheek cells for this purpose. Which one of the following activities should she first do ?
68.
Which one of the following is true about plant cells ? They have
69.
A plant cell is placed in a solution which has lower solute concentration than its contents. After a few minutes the cell will become
70.
Which one of the following is correct about human food digestion ?
71.
Which one of the following sentences describes the tropical rainforest biome? It has
72.
Fresh water biomes like streams and rivers are characterized by the presence of
73.
Which of the following statements correctly describes intra — specific competition and inter-specific competition.in intra-specific competition the
74.
Which one of the following stages of cell division is correctly described in meiosis II?
75.
Which one of the following events is an example of a sex influenced trait?
76.
Which one of the following description of proteins is correctly matched with its function in a cell membrane?
77.
In the aerobic cellular respiration
78.
Suppose a hypothetical cell of 15% solute concentration is put in a beaker containing 90% water and 10% solute. In which way will the water move?
79.
Which one of the following is correct about transport of substances across the cell membrane?
80.
Which one of the following processes of aerobic respiration takes place in the krebs cycle?
81.
Identify the correct statement regarding translation in eukaryotic cells. The
82.
Which one of the following sentences explains how crossing over brings variation?
83.
Industries in the medicine sector use glucose oxidase in clinistix strips for
84.
Consider the following model of DNA replication
Which one of the following is true about A, B and C ?
85.
What is the central role of tRNA in translation?
86.
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?
87.
Which one of the following sentences explains the lock - and - key model of enzyme action? The
88.
Which one of the following sentences is correct about apo-enzymes? They are
89.
How does a competitive inhibitor affect an enzyme catalyzed reaction? By
90.
In the course of evolution, which of the following is true about the human brain?
91.
All of the following are examples of innate behaviors EXCEPT
92.
Which one of the following is an example of in sight learning ?
93.
Which one of the following is an example of a learned behavior ?
94.
Which one of the following is an example of territorial behavior of animals ?
95.
Which of the following is an Ethiopian endemic plant ?
96.
Walia ibex is an endemic animal species in Ethiopia which is found in
97.
All of the following sentences are correct about pollution EXCEPT
98.
When a biologist shares her research findings with other fellow biologists she is:-
99.
In the above table, which number holds only organic molecules?
