Universidade Privada de Angola (UPRA) University Entrance Examination — Exames de Acesso

In cell biology, which cellular membrane structure consists of a phospholipid bilayer embedded with transmembrane proteins, cholesterol, and glycolipids according to the Singer-Nicolson Fluid Mosaic Model?

• APlasma membrane (Membrana plasmática)
• BNuclear pore complex
• COuter mitochondrial membrane only
• DPeptidoglycan cell wall

Which of the following elements has the electronic configuration 1s^2 2s^2 2p^6 3s^2 3p^4 in its ground state?

• AOxygen (Oxigénio - O, Z = 8)
• BSulfur (Enxofre - S, Z = 16)
• CSilicon (Silício - Si, Z = 14)
• DArgon (Árgon - Ar, Z = 18)

What is the pH of a 0.050 mol/L aqueous solution of barium hydroxide, Ba(OH)2, assuming complete electrolytic dissociation in water?

• A12.7
• B1.0
• C13.0
• D14.0

Which natural pacemaker structure in the right atrium rhythmically generates the electrical impulses that establish normal sinus rhythm?

• AAtrioventricular node (Nódulo auriculoventricular)
• BBundle of His (Feixe de His)
• CPurkinje fibers (Fibras de Purkinje)
• DSinoatrial node (Nódulo sinoauricular / Nódulo sinusal)

What is the derivative f'(x) of the composite function f(x) = sin(3x^2 + 1)?

• Af'(x) = 6x * cos(3x^2 + 1)
• Bf'(x) = cos(3x^2 + 1)
• Cf'(x) = -6x * cos(3x^2 + 1)
• Df'(x) = 3x^2 * cos(3x^2 + 1)

In Portuguese syntax and verbal regimen (regência verbal), which preposition is normatively required by the transitive indirect verb 'obedecer' in standard academic prose?

• APreposition 'de' (e.g., 'Os alunos devem obedecer das normas')
• BPreposition 'a' (e.g., 'Os alunos devem obedecer às normas da universidade')
• CPreposition 'em' (e.g., 'Os alunos devem obedecer nas normas')
• DDirect object without any preposition (transitivo direto)

A sound wave of frequency f = 1,000 Hz is emitted by a stationary emergency ambulance. An observer approaches the ambulance at a speed of vo = 34 m/s in air where the speed of sound is v = 340 m/s. What observed frequency f' is heard by the approaching listener according to the Doppler Effect?

• A900 Hz
• B1,000 Hz
• C1,100 Hz
• D1,200 Hz

Solve the logarithmic system in R: { log(x) + log(y) = 3 ; log(x) - log(y) = 1 }, where log denotes the common logarithm (base 10). What are the values of x and y?

• Ax = 1,000 and y = 100
• Bx = 10 and y = 100
• Cx = 2 and y = 1
• Dx = 100 and y = 10

In Portuguese orthography under standard accentuation rules, why does the word 'saúde' receive an acute accent on the letter 'u'?

• AIt contains a tonic 'u' forming a vocalic hiatus (hiato) with the preceding vowel 'a', st…
• BIt is an oxytone word ending in a vowel
• CIt contains an open ascending diphthong
• DIt follows the general rule for paroxytone words ending in the vowel 'e'

What is the coefficient of the x^3 term in the binomial expansion of (x + 2)^5 according to the Binomial Theorem of Newton?

• A80
• B40
• C10
• D20

Which historic Angolan physician, poet, and political leader served as the first President of independent Angola?

• AJosé Eduardo dos Santos
• BHolden Roberto
• CDr. António Agostinho Neto
• DLúcio Lara

What is the equivalent capacitance C_eq of three capacitors C1 = 6.0 muF, C2 = 6.0 muF, and C3 = 6.0 muF connected in series?

• A18.0 muF
• B6.0 muF
• C0.50 muF
• D2.0 muF

In human neurobiology, what is the function of the myelin sheath (bainha de mielina) surrounding the axons of myelinated neurons?

• AInsulating the axon electrically and enabling saltatory conduction of action potentials f…
• BProducing neurotransmitters for release at the synaptic terminal
• CGenerating action potentials in the neuron's dendrites
• DForming the blood-brain barrier around central nervous system capillaries

In Portuguese discourse, what is the primary cohesive function of the underlined transitional locution in: 'A medicina preventiva reduz custos hospitalares; [além disso], melhora significativamente a qualidade de vida da população.'?

• AIdeia de oposição / contraste
• BIdeia de adição / soma de argumentos (Addition / summation of complementary arguments)
• CIdeia de causa / justificativa
• DIdeia de conclusão / dedução

In statistics, what is the variance (variância amostral s^2) of the three numbers: { 2, 4, 6 }?

• A2.0
• B16.0
• C4.0
• D8.0

A sound source emits acoustic waves with a power of P = 12.56 W (4*pi W) isotropically in all directions. What is the sound intensity I at a distance of r = 10 meters from the source? (Use I = P / (4*pi*r^2))

• A0.10 W/m^2
• B1.0 W/m^2
• C0.0010 W/m^2
• D0.010 W/m^2 (1.0 * 10^-2 W/m^2)

What is the molar mass of glucose (C6H12O6)? (Atomic weights: C = 12.0 g/mol, H = 1.0 g/mol, O = 16.0 g/mol)

• A180.0 g/mol
• B160.0 g/mol
• C200.0 g/mol
• D120.0 g/mol

A body of mass m = 1,000 kg accelerates uniformly from an initial speed of 10 m/s to a final speed of 30 m/s along a level road. What total net work W was done on the vehicle during this acceleration?

• A800,000 J (800 kJ)
• B400,000 J (400 kJ)
• C200,000 J (200 kJ)
• D50,000 J (50 kJ)

In chemistry, which of the following expressions represents the mathematical relationship between the hydronium ion concentration [H3O+] and hydroxide ion concentration [OH-] in pure water at 25 degrees C (autoionization constant Kw)?

• AKw = [H3O+] / [OH-] = 1.0
• BKw = [H3O+] + [OH-] = 14
• CKw = [H3O+] * [OH-] = 1.0 * 10^-14
• DKw = [H3O+]^2 * [OH-] = 1.0 * 10^-7

In Portuguese textual composition and academic editing, what is the primary role of a 'tópico frasal' (topic sentence) within a body paragraph of an analytical essay?

• ASummarizing every claim made throughout the entire essay
• BProviding a source citation before the paragraph states its own claim
• CRestating the previous paragraph's conclusion without introducing a new focus
• DIntroducing the central idea or core assertion of the paragraph clearly, which will be de…