Welcome to your Biology national exam 2011
1.
Which one of the following is commonly called the code of life?
2.
What is the function of DNA polymerase?
3.
For which of the following purposes do biologists use centrifuges?
4.
What is the type of scientific research that is directly concerned with studies of the ways of solving problems related to human needs?
5.
Which of the following chromosomal errors creates a cell with an extra chromosome?
6.
In which of the following group of organisms are all the members unicellular?
7.
What is the shape of an enzyme molecule?
8.
Which of the following is the Greek word for life?
9.
Which type of chromosome mutation causes the human genetic defect known as trisomy 16?
10.
What is another name for secondary consumer?
11.
Which of the following statements best describes the role of bacteria in the nitrogen cycle? Bacteria turn:
12.
Both photosynthesis and respiration are involved in:
14.
Which one of the following conditions is least likely to denature an enzyme?
15.
What are the compounds that have the same chemical composition, but different arrangement of atoms?
16.
The hypothesis which a scientist tries to disprove is called:
17.
Of the following patterns of innate behavior in animals, which one is considered the simplest?
18.
In which geologic period is the evolution of humans most probably believed to have happened?
19.
The daily cycle of activity that occurs over a 24— hour period of time is called a:
20.
Which one of the following terms best describes the number of different species in the biosphere or in a particular area?
21.
Which clinical test is routinely performed to diagnose patients for AIDS.
22.
Which one of the following human diseases is NOT correctly matched with its mode of transmission?
23.
What is the ultimate source of the electrons that replace those lost from the photosystem II during photosynthesis?
24.
In which part of mitochondria does the Kreb's cycle take place?
25.
If a homogenate of eukaryotic cells is spun in a centrifuge, which of the cellular organelles settles out first?
26.
Of the following four elements, which one is the least abundant in living things?
27.
In what way does an antiretroviral drug help AIDS patients? It
28.
Within a few weeks after a heavy rain, pools become teemed with tadpoles. What is the source of the tadpoles?
29.
Which bacterial genus fixes nitrogen in the nodules of leguminous plants?
30.
Which of the following pairs of processes add CO to the atmosphere?
31.
One of the following is a non-carbohydrate molecule.
32.
Which of these elements is known to have less than 100d occurrence in many cells?
33.
In which of the following is the current state of biology more of promises than realized major contributions?
34.
If a chimpanzee piles up boxes and climbs on it to reach a bunch of banana hanging from a ceiling, which behavior is manifested?
35.
One of the following is true about a behavior that has a fixed action pattern.
36.
What is the behavior that an animal learns to ignore a trivial stimulus that is repeated many times?
37.
On which of the following points do Lamarck's and Darwin' theories of evolution agree?
38.
One of the following agricultural practices does NOT have a negative effect on biodiversity?
39.
Which model of enzyme action requires that the shape of the substrate molecule is complementary to that of the active site?
40.
The industrial use of enzymes is helpful for the environment as it contributes to reduction of CO emission.
In which of the following is there more mass of CO emissions saved per ton of products by using enzyme technology rather than traditional methods?
41.
If two parents with genotypes Aa' are cross-bred and that of the no codominance in the inheritance pattern, what proportion of the offspring would have genotypes exactly like that of their parents?
42.
What is the general name of crop plants that add nitrogen to the soil because of their symbiotic association with certain types of bacteria?
44.
From which group of microorganisms was the first antibiotics produced?
45.
What is the main method of transmission of botulism?
46.
How many ATP molecules are produced during the complete cellular respiration of one glucose molecule?
47.
If the average diameter of the human red blood cell is 0.000007m, which one is its correct diameter when expressed in a smaller unit?
48.
Which procedure allows biologists to separate different cellular organelles and study their structure and compositions separately
49.
One of the following sources of evidence provides a more direct support to the process of Charles Darwin's theory of evolution.
50.
Which of the following is an example of a cell formed by reduction division?
51.
The different steps for complete aerobic respiration are:
52.
Which of the following is NOT a function of lysosomes?
53.
Organelles in the cytoplasm that are known as power house of the cell are:
54.
Which of the following statements is NOT correct about the effect of temperature on enzymes.
55.
When glucose molecules are joined by a-linkage which of the following carbohydrate is obtained?
56.
The most abundant inorganic molecule in the atmosphere that traps heat is:
57.
Through which of the following methods can blood be separated into its cellular and fluid parts?
58.
Which animal behavior pattern is best illustrated by the famous Pavlov's dog?
59.
The active sludge method of Sewage treatment is based on the principle of
60.
Which of the following processes indicate the process of photosynthesis?
61.
Which of the following concept is attributed to Charles Darwin?
62.
Transfer of a gene or genes through a virus is called:
63.
If color blindness is sex linked and a color-blind man marries the daughter of a color-blind person, which of the following is their progeny?
64.
Under ideal conditions and unlimited resources, continuous population growth pattern is known as:
65.
The fact that Ethiopia is a regional center of biological diversity which of the following diversity is expressed?
66.
If you were to travel from the Arctic Circle to the Equator, what sequence of biomes would you most likely pass through?
67.
When is reverse transcriptase a useful enzyme? When
68.
When an organism containing a gene which does NOT belong to it and is derived from somewhere else, the organism is said to be:
69.
'Skinner box' is used for experiments in:
70.
Occurrence of endemic species in Ethiopia is due to:
71.
Which of the following is the common idea held by all the creationists?
72.
How many nucleotides are needed to form codons for a protein that is 100 amino acids long?
73.
If allowed to self-pollinate, which of the following pea genotype would produce progeny with 9: 3:3:1 phenotypic ratio?
74.
What is the population growth phase of the current world population?
75.
As an ecological succession passes from a lower to a higher seral stage, which of the following will NOT happen?
76.
In what ways do retro viruses differ from the other RNA viruses?
77.
Which of the following can reverse or reduce an allosteric enzyme inhibition?
78.
Low temperature affects enzyme activity without denaturing the enzyme molecule?
79.
One of the following behavioral pattern of human babies is more or less similar to the imprinting of newly hatched goose?
80.
Among the following, which one had the cranial capacity of about the same size as that of Homo sapiens?
81.
What is the survival value of a social behavior in which some birds move in large groups?
82.
If a radioactive substance that weight 5,600 grams and has a half-life of 100 years is left with 700 grams, for how long has the decaying activity been undergoing?
83.
Which of the following statements about transgenic organisms is correct?
84.
Which of the following is a correct statement about the difference between a bacterium and a virus?
85.
In an experiment to study photosynthesis, a plant was provided with radioactive carbon dioxide as a metabolic tracer and the radioactive carbon was incorporated first into oxaloacetate. Which one of the following would best characterize this plant?
86.
Which of the four stages in the aerobic respiration of glucose does NOT produce ATP?
87.
Which of the following has the highest water potential than all the other?
88.
In the human body, which conditions are generally considered optimum for most enzymes?
89.
Which of the following statements is NOT correct?
90.
What is the biome of the world where succulent plants are commonly found?
91.
The following statements are correct regarding ecological succession EXCEPT:
92.
Which one of the following happens during integration of viruses in host cells?
93.
Which of the following results in the production of oxygen during photosynthesis?
94.
Which one is first inhibited if a cell contains excess of ATP?
95.
Which of the following happens if a nucleolus is missing in a cell?
96.
Which of the following statements best describes an induced fit-model?
97.
If other conditions were to remain constant, which one of the following changes would explain a reduced rate of activity in an enzyme-controlled reaction? Increase in
98.
Lipids to become sphingolipids must contain:
99.
One of the following is NOT true about operant conditioning.
100.
Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution?
