Welcome to your Biology 2007
1.
Which of the following units of measurement is more convenient to express the size of cellular organelles?
2.
Which of the following step of the scientific method comes before all the rest?
3.
What do we call a scientists who specializes in studying insects?
4.
To which one of the following organic molecules do enzymes belong
5.
Which of the following is a coenzyme
6.
Which of the following behavioral biologists is known for his study about imprinting behavior in animals?
7.
Which tool of the biologist is more frequently used to study cell structure in the laboratory
8.
What colour do gram-positive bacteria stain with Gram's stain?
9.
Which group of organisms in the ecosystem release nutrients locked up in dead bodies of organisms?
10.
Which of the following are the two major constituents of eukaryotic chromosomes?
11.
Which one of the following crops has its center of origin and diversity in Ethiopia has became a leading international commodity of commerce?
12.
Which group of animal has the highest number of total and endemic species in Ethiopia ?
13.
What is the molecule that supplies the quickest and suitable source of energy to cells?
14.
A carbohydrate compound is known to have 12 carbon atoms in the whole molecule. What could this compound be?
15.
Among the following organisms, which one belongs to the prokaryotes?
16.
Which of the following is consistent with the understanding of human evolution?
17.
Baby ostriches tend to follow the first moving object that they see as they hatch out of the eggs. What kind of animal behaviour does this demonstrate?
18.
Which of the following true about mutations that occur in normal body cells?
19.
What is the processes called when two bacteria directly contact cell to cell and exchange their genetic information?
20.
Why is it that mutations are considered as one of the raw materials of evolution?
21.
Which of the following is formulated as a possible outcome of an experiment?
22.
If certain food stuff gave a positive result with benedicts test only after it was hydrolysed with hydrochloric acid, which of the following substances could it be?
23.
In scientific method, what is the importance of a background research for a given problem?
24.
Which of the following is NOT true about mitochondria and chloroplasts?
25.
Which of the following molecules is NOT a polymer?
26.
What dose it mean when biologists express the cell membrane as a unit membrane?
27.
Which of the following classes of molecule CANNOT pass easily across the cell membrane by simple diffusion?
28.
Which of the following substance has a shape which is similar to that of the substrate of an enzyme?
29.
At which level of structural organization do proteins have the alpha helix shape?
30.
Among the following scientists who contributed to the cell theory, identify the one who stated that a cell can arise only from another cell like it.
31.
Which of the following modes of transport is used by cell to move substance against their concentration gradients?
32.
Which of the following features makes human T-lymphocyte cells more vulnerable to HIV attack? Presence of:
33.
Which one of the following terms refers to how fast an enzyme acts on its substrate?
34.
Which of the following factor determines the rate at which organelle settle out of cell homogenate if spun in a centrifuge?
35.
Which one of the following classes of organic molecule is the least important source of energy for cellular respiration?
36.
Which one of the following processes has a decreasing effect on the concentration of atmospheric carbon dioxide?
37.
Which of the following is NOT true about instinctive behaviour?
38.
In which of the following ways do retroviruses differ from other RNA viruses?
39.
Which of the following group of micro-organisms does not contain parasitic members?
40.
Which of the following is NOT the correct characteristics of tropical rainforests?
41.
From evolutionary point of view, which of the following animals is expected to have haemoglobin proteins that are least similar to that of human?
42.
For what purpose do molecular biologists use the technology known as polymerase chain reaction or PCR?
43.
What is the long term primary effect of the current tree planting activities that Ethiopia is undertaking ?
44.
Suppose when you first enter a room you notice an unpleasant smell which you eventually forget about its presence, what is this behaviour called?
45.
Which of the following is an evolutionary requirement for two sub-populations of species to evolve in to independent species?
46.
What does a restriction enzyme do?
47.
Which element is found in nucleic acids?
48.
From where do plants get most of their nutrients?
49.
What do you call a group of genetically identical plants produced by vegetative reproduction?
50.
What is the base found in RNA in place of thymine of DNA ?
51.
The most complex structure of proteins is called
52.
Which one of the following is the smallest of all?
53.
What is the ultimate source of all scientific knowledge?
54.
The optimum temperature of enzymes found in thermophilic bacteria is:
55.
A cow was found to yield much higher than any of the breeds of the parental cattle. What could be the most probable reason for this ?
56.
In the formation of a macromolecule, what type of reaction would join two subunits together?
57.
Which are the four most abundant elements in living cells?
58.
When the F1 hybrid of a monohybrid cross is back crossed with the homozygous recessive parent, what percentage of the offspring would be homozygous recessive?
59.
which of the following is an inorganic molecule?
60.
Which of the following expression is more related to the phase "survival of the fittest"?
61.
To which group of organic compounds do the triglycerides and waxes belong?
62.
What did Francesco Redi prove through his scientific experiment?
63.
Which one of the following shows the feeding methods of decomposers?
64.
What happens when the carrying capacity of an ecosystem is reached?
65.
In which industrial products is pyruvate fermentation by yeast practically applied?
66.
If a substance that weighs 2000 grams and has a half-life of 100 years is left with only 250 grams, for how long has the radioactive decaying activity been undergoing?
67.
What does an ethnologist study?
68.
Which one of the following is a biotic factor operating within an ecosystem?
69.
When athletes take part in short distance running, how do the cells generate most of the energy that is quickly needed?
70.
What do you call the reasoning technique in science where general principle are used to analyse specific cases?
71.
If the rate of an enzyme catalysed reaction remains constant even when more substrate is added to the reaction, which of the following might be the reason?
72.
Which of the following will primarily happen if the enzymes in the lysosomes of a cell are defective?
73.
Which of the following is true about all proteins?
74.
Which of the properties of water allows mosquito larvae to hung themselves dawn in to the water from the water surface?
75.
Which of the following properties of enzymes makes it possible that a single enzyme molecule can act on many substrate molecules?
76.
The T-lymphocyte cells of AIDS patients are destroyed by:
77.
Which stage in the life cycle of HIV is disrupted if AIDs patients are treated with a drug that has protease in habiting activity?
78.
Of the following four cells whose surface area to volume ratio is given which cell can more efficiently transport its needs of materials across the cell surface?
79.
Cells immediately use the energy that electrons lose as they pass along the chain of electron carriers to:
80.
Which of the following is a routine method used by clinics to test people for HIV infection?
81.
Which of the following is NOT true about the nature of the first form of organisms on earth? They were
82.
Suppose a fossil initially contains 100,000 atoms of a certain radioactive element whose half-life is 10,000 years, after how many years would the number of the atoms be 12500?
83.
The following are Simpson's Index of species diversity calculated for four areas containing the same types of species. Which index value is from the area dominated relatively by a fewer number of species?
84.
which of the following happens in both cyclic and non-cyclic photophosphorylation?
85.
Which of the following is NOT a true characteristic of the populations of most of the developing countries of the world?
86.
Which of the following come first in the course of organic evolution?
87.
Choose the step that comes at the last step in the scientific method.
88.
Which of the following is NOT true abut C4 plants such as tef (Eragrostistef)
89.
What is the reason that plants do not use nitrogen directly from the atmosphere?
90.
What does the fermentation of glucose by yeast normally yield?
91.
Which hormone promotes human sleepfulness in darkness and controls the sleep-wake cycle?
92.
Which two nitrogenous bases belong to the purines?
93.
Which of the following is true ?
94.
Which of the following is a functional group of a fatty acid?
95.
Which one of the following is an example of an orientational innate behaviour?
96.
One of the following is true about bacteriophages that have lysogenic life cycle.
97.
In Pavlov's experiment on the classical conditioning of doges ,what does the reaction of the dogs to the sound of the bell represent?
98.
What is the purpose of the in folding of the inner -membrane of the mitochondrion?
99.
Which of the following is a worthwhile biological problem for scientific investigation ?
100.
Which of the following biomass of the earth has the greatest diversity of species?
