ΕΡΩΤΗΣΕΙΣ ΒΙΟΛΟΓΙΑΣ ΧΗΜΕΙΑΣ

ΕΡΩΤΗΣΕΙΣ ΒΙΟΛΟΓΙΑΣ ΧΗΜΕΙΑΣ

ΕΡΩΤΗΣΕΙΣ ΒΙΟΛΟΓΙΑΣ ΧΗΜΕΙΑΣ

ΕΡΩΤΗΣΕΙΣ ΒΙΟΛΟΓΙΑΣ ΧΗΜΕΙΑΣ

To help you take a successful entrance exam we provide you with the actual exam question list of Biology and Chemistry


BIOLOGY

1. In this type of mutation, one or two nucleotide pairs are inserted into or deleted from
DNA:

A. frameshift mutations
B. base substitution mutation
C. missense mutation
D. nonsens mutation

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2. During muscle contraction, which of the following shortens?

A. Z lines
B. sarcomere
C. actin and myosin filaments
D. all of the above
E. none of the above

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3. Which of the following is part of the appendicular skeleton?

A. pectoral girdle
B. pelvic girdle
C. femur
D. skull
E. all of the above are appendicular

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4. If a transcribed DNA strand is 5’ATCTGTTAGA 3′, then the corresponding sequence of
RNA is:

A. 5′ UAGAGTTAGA 3′
B. 3′ TAGACAATCT 5′
C. 5′ UAGACAAUCU 3′
D. 3′ UAGACAAUCU 5′

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5. The parasympathetic nervous system has what effect on the heart’s pacemaker?

A. excites it
B. inhibits it
C. kills it
D. has no effect at all
E. has a variable effect; sometimes excites it, sometimes inhibits it

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6. What is the function of the tricuspid valve?

1. Prevents the backflow of blood from the right atrium to the right ventricle.
2. Prevents the backflow of oxygen-rich blood from the right ventricle to the right
atrium.
3. Prevents the backflow of carbon dioxide-rich blood from the right ventricle to the right
atrium.
4. Assure the unidirectional blood flow.
A. 1. 2. 3. B. 4. C. 2. 4. D. 1. 3. E. 3. 4.

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7. The target tissue for luteinizing hormone is the

A. liver
B. kidneys
C. pancreas
D. thyroid gland
E. gonads

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8. What type of hormones enter their target cells?

A. steroid hormones
B. peptide hormones
C. both of the above
D. none of the above

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9. What can be the genotype of a person of Rh+ blood group?

A. Homozygous dominant
B. heterozygous
C. homozygous recessive
D. A and B
E. All of the above

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10. When the ribosome moves down the mRNA strand during translation, and amino acids
are added one by one to the polypeptide chain, the process is called:

A. amino acid synthesis
B. amino acid template translation
C. elongation
D. initiation

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11. The possible pattern of inheritance of phenylketonuria

A. dominant-recessive trait, the disorder is caused by a recessive allele
B. dominant-recessive trait, the disorder is caused by a dominant allele
C. Incomplete dominant trait, the heterozygous individuals are affected
D. Incomplete dominant trait, the homozygous individuals are affected

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12. What can be the component of a DNA ?

1. nucleotides
2. nucleoside-diphosphates
3. one phosphate – one deoxyribose – thymine
4. one phosphate – one deoxyribose – uracil
5. one phosphate – one ribose – thymine
A. 1,3. B.1,2,3. C.1,2,4. D.2,3. E. 1.

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13. What does cardiac output depends on?

A. stroke volume
B. heart rate
C. temperature
D. stress
E. all of the above

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14. Which statement is wrong?

A. Most of the CO2 is transported in the plasma as bicarbonate ion.
B. Oxygen binds to hemoglobin in the lungs.
C. Oxygen-hemoglobin dissociation curve depends on pH.
D. Some CO2 diffuses to the capillaries from the alveoli.
E. Hemoglobin consists of four polypeptide chains.

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15. Which statement is wrong?

A. During expiration the diaphragm relaxes.
B. During inspiration the diaphragm contracts.
C. Diaphragm is smooth muscle.
D. The amount of air moving in and out of the lungs with each normal breath is called the tidal volume.
E. Some CO2 also gets to the lungs whith inspiration.

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16. Each ribosome is composed of:

A. one large spherical structure in which a groove passes through the middle for reading mRNA
B. one small subunit and one large subunit that do not join together until translation
C. two small and one large subunits that become activated when translation is initiated
D. one small and two large subunits that are activated by mRNA

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17. Out of the following vitamins which ones are water soluble?

1. Vitamin C
2. Vitamin D
3. Vitamin B complex
4. Vitamin K
5. Vitamin A.
A. 1,2,3. B. 1,3. C. 2,4,5. D. 3,4,5. E. 3.

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18. Which match is correct for the enzyme and its product?

1. Maltase – glucose
2. Lipase – glycerol
3. Lipase – glycerol and fatty acids
4. Pepsin – short polypeptides
5. Sucrose – glucose and maltose.
A. 1,2. B. 1,2,4. C. 1,3,4. D. 1,3,5. E. 1, 4.

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19. What is true about viruses?

1. they are procaryotes
2. they need host cells for their reproduction
3. Herpes is caused by a virus
4. they contain either DNA or RNA as hereditary material
5. AIDS is caused by a virus.
A. 1,4,5. B. 2,3,4,5 C. 2,4,5. D. 2,3,4. E. 1,4.

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20. Which structures are made from tubulin?

1. mitotic spindle
2. centrioles
3. myofilaments
4. ribosomes
5. flagella
A. 3,4,5. B. 1,2. C. 1,2,3. D. 1,2,5. E. 1.

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CHEMISTRY

1. A sample of N2 gas occupies 4.48 L volume under standard conditions (1 atm, 00C).
What is the mass of the sample? The atomic mass of N is 14 amu.

A: 5.6 g B: 56 g C: 2.8 g D: 28 g E: 22.4 g

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2. Which properties are characteristic for the nonmetals?

1. high electrical conductivity
2. large ionization energy
3. high electronegativity
4. low electron affinity
A: 1,2 B: 2,3 C: 3,4 D: 2,4 E: 1,2,3

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3. Concerning 1.2 x 1024 CO2 molecules, which statements are true?

The molar mass is 44 g/mol.
1. it is 12 moles.
2. it occupies 1.2 x 22.4 L volume under standard conditions.
3. it has a mass of 88 grams.
4. it consists of 3.6 x 1024 atoms.
A: 1,3 B: 1,4 C: 2,3 D: 2,4 E: 3,4

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4. Which of the following substances contain covalent bonds only?

1. BaCl2(aq) 2. CCl4(l) 3. HCl(g) 4. NH4Br(aq)
A: 1,2,3,4 B: 1,2,4 C: 2,3 D: 1,3 E: 2,3,4

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5. Which of the following atoms are isotopes of each other?

X: 11 protons, 11 electrons, 12 neutrons
Y: 11 protons, 10 electrons, 12 neutrons
V: 11 protons, 11 electrons, 13 neutrons
W: 12 protons, 12 electrons, 12 neutrons
A: X and Y B: X and W C: Y and V D: V and W E: X and V

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6. An aqueous solution is prepared by dissolving 1.6 g NaOH in 250 mL final volume.
What is the molar concentration of the solution?
The molar mass of NaOH is 40 g/mol

A: 6.4 mol/L
B: 1.6 mol/L
C: 16 mol/L
D: 0.16 mol/L
E: 64 mol/L

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7. N2(g) + 3H2(g) 2NH3(g)
The reaction is exothermic towards product formation. Which of the following
changes of conditions will shift the equilibrium of the reaction to the right?

1. increase the pressure.
2. increase the concentration of NH3.
3. increase the concentration of H2 gas.
4. decreasing the temperature.

A: 1,3,4 B: 2,3 C: 2,4 D: 2,3,4 E: 1,2,3,4

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8. When two elements, X (atomic number 13) and Y (atomic number 8), react the
compound formed will be:

A: XY B: X3Y2 C: XY2 D: X2Y E: X2Y3

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9. Which is the most basic solution?

A: pH=11
B: pOH=12
C: pOH=2
D: [OH-]=10-4 mol/L
E: [H+]=10-4 mol/L

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10. Which set contains only polar molecules?

A: NH3, H2O, SO2
B: SO3, H2S, H2O
C: HCl, CO2, NH3
D: Cl2, SO2, CO2
E: CCl4, H2O, NH3

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11. In any reaction where a calcium atom changes to calcium ion, the calcium atom

1. has lost an electron.
2. has become an anion.
3. has been oxidized.
4. has achieved noble gas electron configuration.
A: 1,2 B: 2,3 C: 3,4 D: 2,4 E: 2,3,4

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12. What is the oxidation number of Cr in K2Cr2O7

A: -6 B: +6 C: +12 D: -12 E: +2

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13. Which group has the greatest first ionization energy?

A: halogens
B: carbon family
C: oxygen family
D: alkali metals
E: alkaline earth metals

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14. Water solutions of the following five compounds have the same molar concentrations.
Arrange them in the order of increasing pH.

A: CH3COOH, HCl, NaCl, NH3, KOH
B: KOH, NH3, NaCl, CH3COOH, HCl
C: HCl, CH3COOH, NaCl, NH3, KOH
D: HCl, CH3COOH, NH3, KOH, NaCl
E: CH3COOH, HCl, KOH, NaCl, NH3

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15. How many grams of solid potassium chloride are needed to prepare 200 mL solution
with 15 % m/m concentration? The density of the solution is 1.2 g/mL.

A: 25 g B: 0.25 g C: 360 g D: 36 g E: 0.09 g

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16. Which are the oxidation-reduction reactions?

1. 2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g)
2. 2NaOH(aq) + H2SO4(aq) Na2SO4(aq) + 2H2O(l)
3. Ca2+(aq) + CO3 2─(aq) CaCO3(s)
4. H2(g) + Cl2(g) 2HCl(g)
A: 1,2,3,4 B: 1,2 C: 3,4 D: 1,3 E: 1,4

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17. Choose the compound with an ester group.

A: H3C CH2 C NH CH3O

B: H3C CH2 C O CH3O

C: H3C CH2 C OHO

D: H3C CH2 C CH3O

E: H3C CH2 O CH3

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18. Which pairs are structural isomers?

1. H3C C CH2 CH3 O and CH2 CH2 C HO H3C

2. H3C C CH2 CH3 O and H3C CH2 C CH3 O

3. H3C O CH2 CH3 and H3C CH2 CH2 OH

4. H3C C NH CH2 CH3 O and H C CH2 CH2 CH2 ONH2

A: 1,2 B: 2,3 C: 1,3,4 D: 2,3,4 E: 1,2,3,4

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19. The main product in the following reaction is:
 H3C CH CH2 + H Br

A: H3C C CH2 Br

B: H3C CH CH Br

C: H3C CH2 CH2 Br

D: H3C CH CH3 Br

E: H3C CH CH2 Br Br + H2

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20. Which statements are true for the following molecule in its open chain form?

1. It is an aldopentose.
2. It has 4 chiral carbon atoms.
3. It is a monosaccharide.
4. It is a D-sugar.
A: 1,3 B: 2,4 C: 3,4 D: 1,2,3 E: 1,3,4

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