PPSC BIO-DEMO TEST (SMART INSTITUTE)

02- Which one of the following would exocrine cells be expected to contain as a result of their function?

03- The nuclei of both plant and animal cells contains one or more dense bodies known as nucleoli. Which one of the following correctly describes the function of nucleoli?

04- Which of the following cell structures contains the highest concentration of RNA?

05- Which of the following in all eukaryotic cells?

06- A peptide bond is formed between.

07- A sequence of amino acids may end in either an amino group (-NH2) or a carboxyl group (-COOH). What is the theoretical number of chemically different dipeptides that may be assembled from 20 different amino acids?

08- The secondary order of protein structure is.

09- How many fatty acid molecules are normally present in a fat or oil molecule?

10- Most polysaccharides are composed of chains of condensed.

11- Polysaccharides are synthesised in plants by the process of

12- Which one of the following reactions results in the conversion of amino acids to proteins?

13- Which molecule is a co-factor used by dehydrogenase enzymes?

14- specificity of enzymes is due to

15- Which one of the following enzymes shows the greatest substrate specificity?

16- An enzyme increases the rate of a reaction by

17- Which one of the following bonds permanently to the active site of an enzyme?

18- The reaction rate salivary amylase with starch decreases as the concentration of chloride ions is reduced. Which of the following describes the role of the chloride ions?

19- The absence of centrioles from higher plant cells means that during somatic cell nuclear division there is

20- If one ignores the effect of crossing over, then the possible number of different haploid cells which could arise by the meiotic division of a diploid cell containing 10 chromosomes (i. e. n=5) is

21- The formation of chiasmata is an important feature of meiotic division because it

22- 'Suddenly, the chromatids belonging to each chromosome part company and move towards the opposite poles of the spindle.' This is a description of mitotic

23- During which phase of meiosis are chiasmata formed?

24- The absence of centriols from higher plant cells means that during somatic cell nuclear division there is

25- A molecule of transfer RNA has the anticodon sequence UAC. What will be the corresponding nucleotide sequence in the DNA?

26- The two pyrimidine bases most commonly found in DNA are

27- The potentiality for replication of deoxyribose nucleic acid depends on

28- which statement describes the base pairing in nucleic acids?

29- The nitrogenous bases present in RNA are the same as those present in DNA except that

30- An anti-codon is the sequence of the nitrogenous bases on the

31- What is a codon?

32- What is anticoden?

33- Genetic recombination in bacteria leads to variation. Which process leading to genetic recombination in bacteria involve a virus?

34- Which feature occurs only in the life cycle of the influenza virus?

35- A gene transfer occurred between two strains of bacteria. It was observed that cell-cell contact is NOT required, and a filter that removes viruses eliminates transfer. This would mean that the transfer occurred by

36- Viruses have some of the properties of living organisms. Which of the following is a characteristic of all organisms, but not of viruses?

37- A region of eukaryotic DNA consists of over fifty repeats of the same sequence of twelve bases. Where is this repetitive region least likely to be found?

39- Which of the following is NOT a mechanism whereby a proto-oncogene is converted to an oncogene?

40- Which of the following does NOT lead to cancer formation?

41- In domestic cats the genes for yellow fur and black fur are an allelic pair which are sex-linked and codominant. When black females are mated with yellow males, which one of the following is the expected proportion of heterozygotes in the offspring?

42- Which one of the following phenotypic features of Man can be affected only by the genotype?

43- Which one of the following genotypes cannot occur amongst the offspring from a mating between a person of blood group A and a person of blood group B?

44- In the construction of chromosome maps, the evidence is derived mainly from

45-Which one of the following is a correct outline of the main events in photosynthesis?

46- Which metal atom is present in chlorophyll?

47- Why is RuBP important in the process of photosynthesis?

48- Which statement only applies to carbon fixation in photosynthesis?

49- The amount of energy released from a given quantity of glucose is greater in aerobic respiration than in anaerobic respiration. By approximately how much is the energy yield increased in animals?

50- Which one of the following is the main biochemical process which takes place inside the mitochondrial matrix?

51- What is the approximate ratio of ATP synthesised during anaerobic respiration compared with aerobic respiration?

52- Which molecule is common to both glycolysis and the Calvin cycle?

53- The approximate width of a cell membrane is

54- Which cell component forms pinocytic vesicles?

55- Which technique provided the primary evidence for the fluid mosaic model of the cell membrane?

56- By which process does glucose move into red blood cells from the plasma?

57- In a healthy mammal, which one of the following will lead indirectly to increased production of glycogen in liver cells?

58- As a result of the activity of insulin there is

59- Under which of the following circumstances will insulin be secreted?

60- What does increase in the secretion of insulin produce?

61- Which one of the following identifies the role of acetylcholine in nerve physiology?

62- Which of the following is common to all neurones?

63- What will occur if the receptor sites on the postsynaptic membrane are blocked by a drug at the neuromuscular junction?

64- Impulses travel very rapidly along nerves to the leg muscle of a mammal?

65- The frequency of a mutant gene in a population would be likely to increase if

66- Which of the following increases variation within a gene pool?

67- Which of the following increases the number of different alleles in a population?

68- Which one of the following pairs represents analogous features?

69- For what purpose is the polymerase chain reaction used?

70- Plants are more readily manipulated by genetic engineering than are animal cells because

71- To date, genetically modified food crops have been modified to

72- Which of the following characteristics is undesirable in cloning vectors used in genetic engineering?

73- Stem cells are widely used in medical research. Which property of stem cells makes them particularly useful in this research?

74- Which genetic modification could increase the yield of a crop measured as mass of crop produced per unit area per year?

75- Stem cells can be divided into four main types. Which of the four types of stem cell can differentiate into a limited range of tissues?

76- Which property of embryonic stem cells makes them particularly useful in medical research?

77- Which type of gene therapy is least effective in transferring DNA to the nucleus?

78- Which genetic modifications would not decrease the quantity of chemicals sprayed onto crop plants by farmers?

79- Which of the following statements is false about hematopoietic stem cells?

80- Large quantities of useful products can be produced through genetic engineering involving

81- The oldest religion of the world is

82- Where is the Head quarter of the Amnesty International located?

83- Asian Development Bank was established in:

84- Who were the three statesmen who formulated Non-Aligned Movement

85- The permanent Secretariat of SAARC is established at:

86- Who was the founder of HAMAS in 1987:

87- How many official working languages are recognized by UNO?

88- In which month does the UN General Assembly usually meet every year?

89- The term of office of a judge of the International Court of Justice is?

90- Which is the largest country in Africa?

91- In the composition of Earth, Oxygen is approximately:

92- The recipient of "Nishan-i-Haider" captain Kamal Sher Khan belonged to:

93- In term of area, which is the largest Administrative district of Punjab

94- Who was the first Muslim ruler of Indian Sub-Continent

95- Light travels from Sun to Earth is

96- The archaeological site of "Kot Diji" is located near the city of

97- Which of the following district of occupied Jammu and Kashmir has Buddhist majority population

98- Identify the musician who composed the National Anthem of Pakistan

99- Lake Manchar is the largest lake in Pakistan is situated at

100- Velocity of Sound in Air per second is