Welcome to your Biology national exam 2014
choose the best answer from the given
alternatives
1.
Bacterial cell wall is unique due to its
2.
Which genus of bacteria oxidize hydrogen Sulphied to Sulphate and make Sulphate ions available to be taken by plant roots from the soil?
3.
Which one of the following diseases is caused by food poisoning bacteria?
4.
Which one of the following is correct concerning the reproductive cycles of viruses?
5.
Unlike free living cells, viruses are completely
6.
Why are vaccines important? because they help to
7.
Assume you wanted to demonstrate compatibility of blood groups. You took four test tubes labelled O, A, B, and AB based on the blood group that each test tube contains. Then you added unknown blood sample in to each tube and no agglutination was observed in each test tube. From you can conclude that the unknown blood sample was.
8.
Which one of the following diseases the likelihood of contraction HIV?
9.
Even though pasteurization is a technique used to heat milk, beer and other foods, it cannot preserve food unspoiled for years because it.
10.
Which one of the following statements is correct about the binomial nomenclature?
11.
During gas exchange between the alveoli and blood capillaries, oxygen is absorbed by the blood while carbon dioxide is removed This opposite direction of gas exchange occurs due to
12.
Identify the correct statement about the effect of exercise on breathing rate.
13.
The following is a list of functions of the components of blood.
1 Transport of oxygen
2 Fight against diseases
3 Cause blood clotting
Which one of the following is a correct order of blood components responsible for the above functions respectively?
14.
What is the cause of the back flow of blood in to the atria from the ventricles? It could be damage of the
15.
The capillaries are blood vessels that have thin wall and large surface area since their function is
16.
During image formation, light is refracted twice before it is focused on the retina. This phenomenon happens at the
17.
Three students designed the following experimental settings to understand the actual taste of a food.
Student I. Blind folded two students, one of
them tightly holding the nose
While the other without holding the nose and tasting the food
Student 2. Blind folded one student and the
other left with open eyes,
both holding their nose tightly while tasting
the food
Student 3.None of the participants blind
folded and only one eyes, both
holding her nose tightly while tasting the food
Student 4. None of the participants blind folded and both of them taste the food without holding the nose.
Which student designed the most appropriate experiment?
18.
Short sightedness corrected by a concave lens because the problem arises due to a
19.
A patient exhibited symptoms of weight loss, sweating and irritability and the doctor suspected an endocrine malfunction that can be related to the
20.
Secretions of endocrine glands require receptors on cell membrane to be picked by their targets while exocrine secretions do not. This is because
21.
Which of the following diseases is caused by a DNA virus?
22.
currently natural resource are being depleted at increasing rate and waste materials are accumulated and discharged freely in to waterbodies. What is the best strategy to overcome these problems?
23.
Which stage of the nitrogen cycle needs the role of Rhizobium?
24.
A key aspect in the process of recovery of an ecosystem through succession is that.
25.
What are the common plants of the boreal forest?
26.
Which one of the following may NOT be regulated by a plant hormone?
27.
Bushing of a plant results from
28.
Actions such as protection of individual species, reduction of pollution, and reduction of deforestation can collectively be taken as methods of
29.
Which one of the following plants is NOT endemic to Ethiopia?
30.
Which one of the following national parks is characterized by the presence of wildlife such as elephant, lion, cheetah and giraffe?
31.
In Kingdom Animalia, which phylum poisons its prey by tentacles that contain stinging cells?
32.
Mosses are grouped under division bryophyte because they
33.
If you are asked to draw a pyramid of biomass of an aquatic habitat that contains zoo planktons, herrings, sea lions and phytoplankton, which organisms should be placed at the top of the pyramid.
34.
Which one of the following is an adaptation to reduce water loss in plants? Having
35.
why are arctic animals such as seals, walruses and whales large in body size? To
36.
The institute of biodiversity conservation is one of the biological research institutes of Ethiopia attempting to conserve the genetic resources of the country. As such, the institutes major research efforts on all of the following. EXCEPT
37.
The importance of stains in microscopic investigations is explained by their effect in
38.
One of the following problems can occur if the liver does NOT properly carry out its digestive functions
39.
Which of the following is the correct order of food substance, enzyme, and breakdown product of the digestive process in the stomach respectively?
40.
Assume you are trying to demonstrate breathing movements using artificial lung and you pulled down the rubber sheet. This action of pulling represents which step of the actual breathing process?
41.
When three fatty acid molecule and a glycerol molecule undergo condensation reaction, they form
42.
In water, phospholipids become organized in to a bilayer in this configuration, which part of the bilayer faces towards the water?
43.
Four students wanted to conduct chemical tests on unknown food particles and used the following chemicals and materials
Student A: Test tubes and biuret solution
Student B Test tubes, ethanol, water, filter
paper
Student C. Test tubes, Benedict's solution,
water bath
Student D Test tubes and iodine solution
Which of the above students planed a test for
44.
Niacm is used to make the co enzyme
45.
The following are reaction types catalyzed by different classes of enzymes.
1. Transferring hydrogen and oxygen atoms
2. Changing of the molecular form of the
substrate
3. Joining of the molecules by the formation
of new bonds
Which classes of enzymes catalyze the above
the above reactions according to their
46.
The hydrogen ions that used to turn the rotor of ATP synthase come from
47.
What triggers fermentation during exercise?
48.
Which of the following processes explains lactate production during anaerobic respiration in animal cells?
49.
Which one of the following descriptions holds true for the link reaction of respiration?
50.
Which one of the following is the neo- Darwinian idea of evolution? Evolutionary changes occur due to
51.
What is the significance of Australopithecus afarensis in the study of human evolution? To confirm
53.
Which one of the following statements is an example of latent learning?
54.
Which one of the following is correct about the action of Apo enzymes and coenzymes?
55.
Consider the following statements.
1. Genetically determined and common to all members of a species
II. The behavior may be modified by new
experiences
III. Behavior is fully functional at the first attempt
IV. Generally there is no modification of the
behavior
Which numbers describe innate and learned behaviors?
56.
Which one of the following is an example of social behavior?
57.
Consider the following reaction.
Reactant A + Reactant B + Enzyme >> Intermediate >> product AB + Enzyme?
At which point are the chemical bonds weakened? At the
58.
How do enzymes bind and act on their substrates? By using the
59.
Which of the following external factors influence the turnover rate of enzymes by completely damaging their tertiary structure?
60.
During baking of injera, the CO2 produced by yeast is used to
61.
The nerve impulse is transmitted from one neuron to another by a neurotransmitter at the
62.
What happens if the axon is stimulated? formation of A negative charge in both sides of the axon
63.
Assume you wanted to demonstrate a simple reflex action using the knee jerk reflex. You asked a friend to sit with one leg crossed over the other.
Which one of the following indicates the correct demonstration?
64.
A finch with an average length beak was not able insects out of the cracks in the bark of trees as well as one with a longer beak. It was also not able to crush seeds as well as one with a shorter beak. Over time, those with the longer beaks and those with the shorter beaks increased in numbers, while those with average length beaks decreased in number. Which type of selection has been operated in this scenario?
65.
This item is based on the following diagram of the human ear.
What is the name of the human ear part represented by letter 'F’ in the
66.
The cell theory states that cells
67.
Which type of chromosome mutation causes leukemia?
68.
Which theory of the origin of Me states that life has no beginning or ending?
69.
Which one of the following is paleontological evidence of evolution?
70.
This item is based on the diagram of a chloroplast given below
In the above diagram of the chloroplast, what are the of the sites of the light dependent and light independent reactions of photosynthesis respectively?
71.
A color blind daughter can be born when the
72.
. A farmer cut off several regions of a system near to the buds of plant. He removed some of the leaves and dipped the cuts end in son hormones, rooting powder and planted the cuttings in a compost. He kept the cuttings well watered and within a few weeks they developed their own root system and become new independent plants. which one of the following is correct about this experiment? The new plants are most probably
73.
During DNA replication
74.
With four different bases to work with, there are 64 possible triplet codes, but only 20 amino acids are used to make all the different proteins. This is because the DNA code is
75.
. If mRNA brings the code "UGA” into the ribosome
76.
Breakdown of the thick spongy wall of the uterus at the end of the menstrual cycle is associated with the
77.
The first incubation period of HIV is characterized by a duration of
78.
Which one of the following is a behavioral method of temperature regulation in homoiotherms?
79.
What will happen if the water content of the blood is too high?
80.
The movement of water from the roots up to the top leaves of all trees is carried out by
81.
What type of force is responsible if a stool solution is placed in a centrifuge, spins the tube at high speed and the solid particles are forced to settle down at the bottom?
82.
Ten percent of attendants of a wedding ceremony were sick just after having lunch at the ceremony. What should do first to prove scientifically that the sickness was actually linked to the food eaten at the ceremony? She should
83.
Which one of the following importance of water is directly related with its ideal viscosity?
84.
Which property of water prevents ponds from drying during the long dry season?
85.
From the following options, which one contains the steps of writing a scientific report in the correct order?
86.
The following table compares prokaryotes and eukaryotes
in the table x y and z can be represent stated as
87.
Which one of the following is NOT the function of the plasma membrane in eukaryotic cells?
88.
Which one of the following is correct with respect to the structural components of the plasma membrane?
89.
Suppose three potato cylinders were kept in 25%, 1596 and 596 sucrose. Solution respectively and a fourth cylinder was placed in distilled water. Which of the cylinders will be more flaccid? The cylinder in
90.
Consider the following table which shows a result of an experiment where red blood cells were placed in three different X, Y and Z.
The three different solutions in which the blood cells were placed in order of X, Y, Z were
91.
A more comprehensive definition of biodiversity can be given as the
92.
At which stage of the population growth curve is the rate of natality and the rate of mortality are expected to be equal?
93.
Identify the correct statement about intra-specific competition? It is a competition
94.
why Drosophila melanogaster are considered ideal for genetic experiments? Because they
95.
Which one of the following statements best describes the mechanisms by which meiosis brings about variation? Variation in meiosis is because of
96.
In the tropical regions, where there is higher temperature, which one of the following is most likely to take place in the C3 plant's? Rubisco binds with
97.
During the light-independent reactions of photosynthesis.
98.
The suitability of the structural arrangement of chloroplast in relation to its function can indicated by the fact that
99.
Which one of the following events occurs the day time in the CAM photosynthetic pathway?
100.
How many turns of the light independent reaction cycle are required to make one molecular of triose phosphate?
