2021

1. Which hormone controls circadian rhythms?

1. Thyroxin
2. Melatonin
3. Leptin
4. Glucagon

2. All medical graduates around the world swear the Oath of:

1. Hippocrates
2. Aristotle
3. Archimedes
4. Asclepius

3. Among foods rich in polysaccharides are:

1. Potatoes and rice
2. Chicken and fish
3. Cereals and salads
4. Whole grain bread and eggs

4. Calculate 5% of 60:

1. 2
2. 1
3. 4
4. 3

5. Cotton is a(n):

1. Natural product
2. Animal product
3. Artificial product
4. Petroleum product

6. Don Quixote was the work of:

1. Vega
2. Cervantes
3. Erasmus
4. Lorca

7. High levels of cholesterol are found in:

1. Olive oil
2. Butter
3. Legumes
4. Vegetables

8. How many countries form the European Union today?

1. 8
2. 10
3. 27
4. 15

9. If we divide the numerator and denominator of a fraction by the same non-zero number, then:

1. The fraction becomes smaller
2. The fractionbecomes bigger
3. The fraction remains unchanged
4. The fraction becomes a whole number

10. Reduce number 30 by 20%:

1. 20
2. 19
3. 25
4. 24

11. Sir Alexander Fleming, a Scottish physician, invented:

1. Penicillin
2. Vaccines
3. Hand sterilization
4. Radiography

12. The atom nucleus consists of the following:

1. Protons and electrons
2. Protons and neutrons
3. Neutrons and electrons
4. Protons,neutrons and electrons

13. The capital of Denmark is:

1. Riga
2. Copenhagen
3. Stockholm
4. Oslo

14. The capital of Malta is:

1. Malta
2. Genoa
3. Ravenna
4. Valetta

15. The English word taboo does not mean:

1. Religious prohibition
2. Prejudice
3. Fraudster
4. 1 and 2

16. Given the numbers 1, 2, 4, 7, 11, the following order of numbers should be:

1. 22, 16
2. 16, 22
3. 15, 21
4. 16, 20

17. Given the numbers 2, 5, 8, 11, 14, the following order of numbers should be:

1. 15, 16, 17
2. 17, 20, 23
3. 20, 25, 30
4. 20, 23, 26

18. The Iliad was written by:

1. Lysias
2. Isocrates
3. Aeschylus
4. Homer

19. The legendary Achilles was killed by:

1. An arrow to the heart
2. An arrow to the heel
3. An arrow to the head
4. An arrow to the wrist

20. The nautical compass was invented by:

1. The French
2. The Germans
3. The Indians
4. The Chinese

21. The word pandemic is:

1. Latin
2. Italian
3. French
4. Greek

22. If an element with an atomic number 12 gains 2 electrons. It has:

1. 14 electrons
2. 14 protons
3. 10 electrons
4. 10 protons

23. Bronze is an alloy of:

1. Tin and zinc
2. Iron and zinc
3. Copper and zinc
4. Copper and tin

24. … has high thermal conductivity.

1. Glass
2. Copper
3. Wood
4. Plastic

25. In 200g of sugar water 10% w/w, there are:

1. 10g sugar
2. 20g sugar
3. 200g sugar
4. 190g sugar

26. Increasing the concentration of reactants in a chemical reaction increases the reaction rate, as:

1. The activation energy decreases
2. The activation energy increases
3. The average speed of the reacting molecules decrease
4. The frequency of collisions between the reacting molecules increases

27. Solutions are called:

1. The mixtures
2. The alloys
3. The heterogeneous mixtures
4. The homogenous mixtures

28. The components of blood can be separated by which method?

1. Pouring
2. Filtration
3. Centrifugation
4. Chromatography

29. The conversion of a solid to a gas is called:

1. Melting
2. Coagulation (ventilation)
3. Evaporation
4. Sublimation

30. The products of photosynthesis are:

1. Oxygen and carbon dioxide
2. Water and carbon dioxide
3. Glucose and oxygen
4. Glucose and water

31. The speed of a reaction does not increase by:

1. Increasing the temperature
2. Adding a catalyst
3. Increasing the volume of the container in a reaction between gases
4. Increasing the contact surface of solid reactants

32. To separate salt from water in a saline solution, we apply the method of:

1. Evaporation
2. Pouting
3. Filtration
4. Extraction

33. What is the oxidation number of manganese in the KMnO₄?

1. +1
2. +2
3. +5
4. +7

34. Which alloy contains nickel?

1. Brass
2. Bronze
3. Invar
4. Solder

35. Which of the following indicators is considered the most suitable for the titration of a solution of a weak acid HA 0.2M (Ka = 10-5) with 0.2M NaOH standard solution, given that the equivalence point is pH 9.9:

1. Phenolphthalein (color change pH range: 8-10)
2. Methyl red (colorchange pH range: 4-6)
3. P-nitrophenol (color change pH range: 5-7)
4. Bromophenol blue (color change pH range: 3-5)

36. Achemical reaction is:

1. The evaporation of water
2. The melting of ice
3. The photosynthesis
4. The liquefaction (condensation) of vapors

37. A cork has:

1. Higher density than water
2. Higher density than a metal nail
3. Equal density with a metal nail
4. Lower density than water

38. According to the Broensted-Lowry theory, the base is the substance that:

1. Increases [OH-] in water
2. Reacts with water to form OH- ions
3. Gives a pair of electrons to form a covalent bond
4. Receives a proton (H+) from an acid

39. By adding a quantity of NaOH to chemically pure water:

1. The concentrations of H3O+ and OH+ ions increase
2. The concentration of OH- increases, and that of H3O+ decreases
3. The concentration of H3O+ ions increases and of OH- decreases
4. The concentrations of H3O+ and OH- ions decrease

40. Carbon dioxide absorbs some of the:

1. Ultraviolet radiation
2. Infrared radiation
3. X-rays
4. Gamma rays

41. What is the function of proteins in passive transport?

1. To act as electron carries in the membrane
2. To interact with hormones and influence cell processes
3. To act as channels for specific molecules to diffuse across the membrane
4. To release energy from ATP so that specific substances cross the membrane

42. By what process do most bacteria divide?

1. Mitosis
2. Meiosis
3. Conjugation
4. Binary fusion

43. How is DNA ligase used in gene transfer which involves plasmids?

1. Opens bacterial cells and releases plasmids
2. Cuts DNA at a target sequence
3. Links sections of DNA together
4. Produces sticky ends in DNA

44. If ACUCGAGGUCUC was the base sequence of mRNA, what base sequence of DNA was transcribed?

1. ACUCGAGGUCUC
2. ACTCGAGGTCTC
3. UGAGCUCCAGAC
4. TGAGCTCCAGAG

45. In synaptic transmission, which type of ions cause vesicles containing neurotransmitters to move and fuse with the presynaptic membrane?

1. Ca
2. Na
3. K
4. Cl

46. Meiosis II is similar to mitosis in that:

1. Sister chromatids separate during anaphase
2. DNA replicates before division
3. The daughter cells are diploid
4. The chromosome number is reduced

47. Organelles with a single membrane:

1. Golgi apparatus
2. Chloroplast
3. Mitochondrion
4. Nucleus

48. Transcription is the:

1. Copying of DNA nucleotide sequence to form a duplicate DNA strand
2. Reading of DNA nucleotide sequence to form an mRNA strand
3. Reading of a DNA nucleotide sequence to form a polypeptide chain
4. Movement of mRNA from the nucleus to the cytoplasm

49. Translation:

1. Takes place in the  membrane of the nucleus
2. Is the synthesis of RNA using DNA as a template
3. Is the synthesis of a polypeptide with an amino acid sequence determined by the base sequence of an mRNA molecule
4. Stops at the end of a gene, and the RNA molecule is released

50. What enables bacteria to produce human growth hormone?

1. DNA replicationis semi-conservative
2. The polymerase chain reaction can be used
3. They need the hormone to grow
4. The genetic code is universal

51. What is a stem cell?

1. Specialized cell
2. Cell found only in embryos
3. Cell that can differentiate into different cell types
4. Stem cells are living organisms

52. What is the tertiary structure of a protein?

1. The sequence of amino acids
2. The three-dimensional folding of the molecule
3. Th einteraction of the protein with another subunit
4. The interaction of the protein with a nucleic acid

53. What is a characteristic of antigens?

1. They recognizeforeign substances
2. They are producedin the bone marrow
3. They causedisease in humans
4. They stimulate the production of antibodies

54. What is the function of DNA polymerase in DNA replication?

1. Separation of the DNA strands
2. Formationof mRNA
3. Unwinding of the double helix
4. Formation of a complementary strand

55. What provides evidence for the endosymbiotic theory?

1. Mitochondrial DNA in eukaryotic cells
2. 70S ribosomes in prokaryotic cells
3. Gene transfer from prokaryotic cells to eukaryotic cells using plasmids
4. Prokaryotic cells (E. coli) in the large intestine digest proteins

56. Which hormone inhibits appetite?

1. Epinephrine
2. Leptin
3. Thyroxin
4. Glucagon

57. Which method of transport across the membranes can move substances against the concentration gradient?

1. Simple diffusion
2. Facilitated diffusion
3. Osmosis
4. Active transport

58. Which of the following about antibodies is correct?

1. Antibodies are produced in the bone marrow
2. Antibodies can kill bacteria but not viruses
3. Antibodies are composed of polypeptides
4. Antibodies are pathogenic substances

59. Which of the following is correct?

1. Homologous chromosomes carry the same sequence of genes and the same alleles
2. Prokaryotic cells contain two or more chromosome types
3. Eukaryotic chromosomes are linear DNA molecules associated with histone proteins
4. Eukaryotic cells contain additional DNA as small circular plasmids

60. Which of the following stages in cell respiration occurs in the cytoplasm?

1. Krebs cycle
2. The linkreaction
3. The electron transport chain
4. Glycolysis

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