BIOLOGY
DIRECTIONS:
Each of the questions or incomplete statements below is followed by four suggested answers
or completions. Select the one that is best in each case (A, B, C or D).
PART ONE
1. How many different types of gametes could be produced by an individual with the genotype
of AAbb ?
(A) One
(B) Two
(C) Three
(D) Four
2. The diagram below is of the adult human heart. The chambers or vessels that carry
oxygenated blood include which of the following?
(A) 1, 2, and 3
(B) 1, 2, and 4
(C) 3, 5, and 6
(D) 4, 5, and 6
3. All of the following statements about enzymes are true
EXCEPT:
(A) A single enzyme molecule can be used over and over again.
(B) Most enzymes are highly specific with regard to the reactions they catalyze.
(C) Enzymes can function only within living cells.
(D) Enzymes are denatured by high temperatures.
PART TWO
4. Which of these are proteins?
(1) Starch
(2) Pepsin
(3) Amylase
(4) Haemoglobin
(A) 1 and 2
(B) 1 and 3
(C) 2, 3 and 4
(D) 1, 2, 3 and 4
5. Which of the following is NOT a function of the human kidney?
(1) Regulation of sodium in the blood.
(2) Synthesis of urea.
(3) Excretion of glucose.
(4) Excretion of toxins.
(A) 1 and 2
(B) 2 and 3
(C) 2 and 4
(D) 3 and 4
6. The liver has many function - at least 500 different biochemical reactions go on
inside its cells. These functions include:
(1) Storage of glucose as glycogen.
(2) Removal of old red blood cells from the circulation and storage of the iron they contained.
(3) Manufacture of enzyme amylase catalyses the conversion of the starch to maltose.
(4) Manufacture of digestive juice contains enzyme lipase.
(A) 1 and 2
(B) 2 and 3
(C) 2 and 4
(D) 3 and 4
CHEMISTRY
PART ONE
1. What is the Keq expression for the reaction C(s) + CO2(g) ⇄ 2CO(g)?
(A) Keq = 2[CO] / [CO2]
(B) Keq = [CO]2 / [CO2]
(C) Keq = 2[CO] / [CO2][C]
(D) Keq = [CO]2 / [CO2][C]
2. The number of d-electrons in Co3+ (Z = 27) is NOT equal to that of
(A) s-electrons in Mg (Z = 12)
(B) p-electrons in Ne (Z = 10)
(C) p-electrons in CI (Z = 17)
(D) d-electrons in Fe (Z = 26)
3. All of the reactions below represent oxidation-reduction processes EXCEPT the
(A) combustion of iron in chlorine gas
(B) decomposition of hydrogen peroxide
(C) reaction of zinc with hydrochloric acid
(D) neutralization of potassium hydroxide
4. Which one of the following will give 2-methyl-1-butene as the only alkene by heating
with KOH in ethanol?
(A) 1-Bromo-2-methylbutane
(B) 2-Methyl-1-butanol;
(C) 2-Bromo-2-methylbutane
(D) 2-Methyl-2-butanol.
5. Which pair of structures represents a pair of isomers?
(A) СН3ОСН2СН3 and СН3СН2ОСН2СН3;
CH3
CH3
(B) CH3CH2CHCH2CH3
CH3
CH3CHCH2CH2CH3
CH3
CH3
(C) CH2CH2CHCH3
(D) CH3
and
C C CH3
and
CH3
CH3CHCH2CH2
and
HC
C CH3
answer b)
PART TWO
6.
Changes in which factors affect the rate of chemical reaction between two gases?
(1) Concentration of reactants.
(2) Temperature of reactants.
(3) Surface area of reactants.
(A) (1) and (2) only
(B) (1) and (3) only
(C) (2) and (3) only
(D) (1), (2), and (3)
7. What are the chain-propagating steps in the free-radical chlorination of methane?
(A) 2 and 4
(B) 1 and 2
(C) 3 and 5
(D) 1, 3, and 5