Shaheed Zulfiqar Ali Bhutto Medical University, Islamabad
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Each granum consists of_________thylakoids:
Explanation
A granum is a stack of thylakoid membranes in chloroplasts; typical counts per granum are in the tens. The key figure given on the paper is 25–50 thylakoids, so option B is correct; the other choices give unrealistically low or very high counts for a single granum.
The terminal ends of chromosomes are called:
Explanation
Chromosome ends are capped by telomeres which protect chromosomal DNA from degradation. Satellites, kinetochores and nucleolar organizers are different chromosome-associated structures with other functions.
Which organelles would be more abundant in a secretory cell than non-secretory cells?
Explanation
Secretory cells need extensive processing and packaging of proteins and lipids, functions carried out by the Golgi complex, so Golgi apparatus is more abundant. Lysosomes and centrioles are not specifically increased for secretion; vacuoles are more typical of plant cells.
The structure which disappears during cell division is:
Explanation
The nucleolus breaks down during mitosis as ribosomal RNA synthesis halts and the chromatin condenses. Vacuoles, lysosomes and ER remain present (though ER changes conformation) and do not characteristically disappear.
The enzyme ATP synthase is located on the membrane of:
Explanation
ATP synthase is an enzyme complex embedded in the inner mitochondrial membrane (and in chloroplast thylakoid membranes) where it synthesizes ATP using a proton gradient. It is not located on the nucleus, lysosome or vacuole membranes.
Intracellular digestion of food is done by the organelle:
Explanation
Lysosomes contain hydrolytic enzymes that digest macromolecules inside the cell, performing intracellular digestion. Vacuoles may store material, Golgi modifies and sorts proteins, and ribosomes synthesize proteins.
Which axon would transmit an action potential most rapidly?
Explanation
Conduction velocity increases with both axon diameter and myelination; a larger diameter myelinated axon conducts fastest. Thus the 2 mm myelinated neuron transmits signals more rapidly than smaller or unmyelinated options.
Vasopressin is an example of:
Explanation
Vasopressin (antidiuretic hormone) is a small peptide hormone composed of amino acids. It is not a steroid, catecholamine or glycoprotein.
Which function is not controlled by hypothalamus?
Explanation
The hypothalamus regulates hunger, sleep-wake cycles and water balance via hormonal and autonomic control. Long‑term memory storage is primarily a function of cortical and hippocampal structures, not the hypothalamus.
Posterior lobe of pituitary gland produces:
Explanation
The posterior pituitary releases hormones like oxytocin (produced in the hypothalamus and secreted by the posterior lobe). TSH, ACTH and FSH are anterior pituitary hormones.
188 more questions in this paper
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In neurons, the message istransmitted across synapse in the form of chemical messenger called:
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Microscopic gap between the two neurons is called:
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In a reflex arc, the cell body of sensory neuron is located in:
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The feelings and emotions of love and hate are controlled by:
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Which of the following is TRUE about Amoebae?
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Negative feedback mechanism is the characteristic of which class?
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The catalytic activity of an enzyme is restricted to its small portion:
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The maximum enzymatic activity of trypsin is shown at:
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Most enzyme have an optimum temperature of around:
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Enzyme work by lowering the of the reaction they catalyze:
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In terms of enzyme action, maximum temperature refers to a temperature at which:
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_____ reduces the enzyme activity by blocking the substrate from entering the active site due to similar shapes:
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He presented the theory of origin of species by means of natural selection:
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Among the oldest known fossils comes the:
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What is the contribution of hormone cholecystokinin?
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Which of the following is not a component of bile?
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The first chemical digestion of proteins takes place in the:
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Select the duration of cardiac cycle:
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Select the hormone which increases the activity of parietal and chief cells:
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The pathways of water transport in which water moves through plasmodesmata is:
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Enzyme trypsinogen is activated by:
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Emulsification of large fat globules is facilitated by:
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The area between the two lungs is called:
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In human heart, the left atrium receives:
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All viruses are:
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Which of the following is transmitted through infected blood and hypothermal syringes?
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Light independent phase of photosynthesis involves:
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The element whose electrons are excited during light reaction of photosynthesis is:
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Select an example of fibrous protein:
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Which function is NOT performed by proteins?
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Three hydrophobic fatty acid tails and a glycerol molecule join to form a:
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Which bond is the potential source of chemical energy for cellular activities?
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Which property of water enables it to act as temperature stabilizer in living organisms?
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Which molecules do not contribute to the formation of biological membranes?
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Which of the following carbohydrates are sweetest among all?
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Which organelles of animal cells are called suicidal bags?
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Chemically, cell wall of fungi is made up of:
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The organelle which provides neurotransmitters in the nervous pathway is:
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The inner membrane of the mitochondria is folded to form finger like:
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Adenylate cyclase, in the cell membrane acts as:
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Glycogen, lipid droplets form the most important_________of the cell.
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Vaccination is an example of:
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Lymphatic system contains all of the following organs / structures except:
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The unique macro-molecule in the bacterial cell wall is:
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Transfer of genetic material from one bacterium to another through a third party usually bacteriophage is called:
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All of the following are physical methods to control bacteria except:
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Which of the following helps in developing immunity against germs?
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After fertilization, zygote takes________for its journey from fallopian tube to uterus:
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The best temperature forspermatogenesis is:
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In human females, FSH stimulates:
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Leydig cells in testes are responsible for:
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The muscle contraction involve the breakdown of cross bridges of active myosin filaments due to the following process:
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________ is the inflammation of joints:
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Tetany is caused by ________ in blood.
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What is the function of myoglobin?
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A joint in which ends of bones are covered with hyaline cartilage and held together by surrounding tube like capsule of dense fibrous tissue:
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These are the genes which tend to be inherited together and do not assort independently:
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Mendelian inheritance follows which form of dominance relation?
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The unit of kinetic energy is same as that of:
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Which one provides centripetal force in a circular motion of a body?
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How many radians are in one degree?
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Which one of the following is the angular velocity of an electric motor if it rotates at 400 rpm?
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The tension is string at top of vertical circle is:
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The centripetal force in terms of angular velocity is given by:
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Which one of the following is angular speed in radian per hour for daily rotation of our earth?
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Wavelength of wave is defined as:
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Which of the following factor does not affect the speed of sound in air?
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Maximum displacement of particles form it mean position is called:
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The ultrasonic waves have frequency higher than:
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The increase in the speed of sound for each degree rise above 0o C is:
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Continuous, regular and rhythmic disturbance in a medium resulting periodic vibration of a source causes________in the medium:
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The thermodynamic process during which volume of the system remains constant is called:
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The conditions for application of Boyle’s law holds good in:
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The internal energy of a system during an isothermal process:
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Electric intensity due to charge distributions are calculated using which following law?
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The capacitance of capacitor does not depend on:
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The SI unit of potential difference is:
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Electric potential is defined as:
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Ohm meter us the unit of:
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1eV is equal to:
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The total resistance of wire isinversely proportional to:
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Kilowatt hour is a unit of:
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The force exerted on charged particle will be maximum when it enters the magnetic field at:
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When a charged particle enters the magnetic field parallel then it will:
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Two balls collide each other, it has been observed that the collision is elastic. Which statement is advocates the observation?
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The gradient of velocity time is equal to:
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At what pair of angles for a projectile, the ranges are equal?
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Two car traveling on straight road in opposite direction with speed 70 kmh-1 and 60 kmh-1, their relative velocity will be:
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Two bodies having same mass undergo elastic collision then their velocities after collision will be:
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The angle of projection of a projectile for which its maximum height and horizontal range are equal is:
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Slope of distance time graph can never be:
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At highest point in a projectile motion, the velocity will be:
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The unit of power in British engineering system is:
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Work done will be negative if the angle between force and displacement is:
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1 Nms-1 = :
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In inter-conversion of energy, the work done against the friction is:
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A car of mass 800 Kg accelerates from 20m-1 to 30ms-1, the increase in K.E is:
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In Fleming’s right hand rule the middle finger indicates:
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Transformer works on the principle of:
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The efficiency of transformer is:
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Lenz’s law is also a statement of law of conservation of:
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A process in which only one half of alternating current is converted into direct current is called:
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Efficiency of full wave rectifier circuit is almost________than half wave rectifier circuit:
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The conversion of alternating current into direct current is called rectification and circuit is called rectifier. Which component of electronics acts as a rectifier?
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Red light is used in photographic dark room because of:
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Which photons carries the most energy?
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Which one of the following series lies in the ultraviolet region?
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Which x-ray photon will have longest wavelength?
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The half-life of Iodine – 31 is:
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The half-life of carbon is 5730 years. How much carbon will left after 22920 years?
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Skin burns, loss of hair, drop in the white blood cells etc. are examples of:
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Read the given passage and the following statements below. Then choose the option, basing your answer only on the information provided. The Early Medieval period (642-1219 CE) witnessed the spread of Islam in a region which is now known as Pakistan. During this period, Sufi missionaries played a pivotal role in converting a majority of the regional Buddhist population to Islam. Statements: I. Islam was spread in Pakistan region during the Early Medieval period. II. Sufi missionaries converted a lot of people to Islam during this time by force. III. It can be said that the Sufis were responsible for Pakistan ultimately become an Islamic country.
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Read the following and choose the correct answer: “X, Y and Z are three whole numbers less than 24 but greater than 11. X is the smallest prime number. Y is the largest number divisible by 3. Z is the samallest number divisible by 11”?
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I. The government has increased the taxes on all bussinesses in pakistan. II. Many small businesses will have to close their operations in pakistan.]
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Read the following statement, assuming everything in it to be true. Then decide which of the given suggested courses of action logically follow and are pursuing. Statement: My laptop’s battery is low and needs to be charged. Courses of Action: I. Stop using the laptop to save power. II. Get a new fully charged battery and replace it with my old one.
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All hammers are tools. Some tools are useless things. All useless things are trash. Which of the following conclusions are NECESSARILY TRUE given only in information above? Conclusions: I. Some hammers are trash. II. Some tools are trash. III. All useless things are tools.
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The molecules of iodine (I2) form the:
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When two ice cubes are pressed over each other, they unite to form one cube due to:
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For the chemical reaction: N2(g) + 3H2(g) ⇌ 2NH3(g) + Heat We can get maximize the yield of NH3:
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The high pressure of 200 atm in Haber’s process is used for:
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By which of the following factors equilibrim state is attained earlier?
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Which of the following is not the use of Buffer solution?
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What is incorrect about activated complex?
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The unit of rate constants is the same as the rate of reaction in which of the following order of reaction?
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If a reaction is first order with respectd to a reactant then the rate will be__________if the concentration of reactant is doubled:
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The correct equation for the first law of thermodynamics is:
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One calorie is equal to:
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The thermal energy at constan pressure is called:
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Which statement correctly describes the term Standard Electrode Potential?
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Oxidation number of an element in free state is:
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The branch of science which deals with the conversion of electrical energy to chemical energy and vice versa is called:
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Which of the following has greatest difference of electronegativity?
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Ionization energy decreases down the group because:
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Carbon atoms in ethane are hybridized:
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The type of bonding in Zinc is:
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Which of the following is semiconductor?
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Which of the following property decreases in Group 2 as we go down the group?
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Which of the following alkali metal can form normal oxides as well as peroxides?
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The transition element which doesn’t show variable valency:
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The binding energy of transition metals increases upto group:
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Homo-cyclic organic compounds are sub divided into two groups namely:
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The type of isomerism arising due to shifting of proton fron one atom to another in the same molecule is:
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In alkanes, each Carbon has hybridization:
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For the reaction given below: N2 + 3H2 ⇌ 2NH3 How many moles N2 are required for synthesis of 4 moles of NH3?
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Al reacts with O2 according to the following reaction: 4Al + 3O2 ⟶ 2Al2O3 27g of Al will react with how much of O2?
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One mole of a substance is the amount of that substance that has the same number of particles (atom, ions or molecules) as there are atoms in exactly:
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Principle quantum number is represented by the symbol:
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Shape of the sub shell is explained by which quantum number:
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The electronic configuration for degenerated orbitals is explained by:
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Maximum number of electrons which can be placed in one orbital is:
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Air is a mixture of gases. The molecules of air do notsettle down due to:
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Collision shown by gases involve the following:
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According to Charles law volume of gas reduces to zero at:
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The strongest hydrogen bond is present in:
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Which of the following has highest surface tension?
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Which of the following has highest boiling point?
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Ice floats on the surface of water due to:
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Which of the following is not oxidized by any oxidizing agent?
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The correct order of reactivity of hydrocarbons is:
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Reactivity of order of halogen acid is:
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Alkyl halides are also known as Halogen derivatives of:
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Grignard reagent is formed when alkyl halide reacts in the presence of halogen with:
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Phenols are very reactive towards:
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Both alcohols and phenols contain:
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Select the correct order of relative acidic strength of phenol, alcohol, water, and carboxylic acid:
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Carboxylic acid reacts with Alcohol to form:
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Catalytic reduction of Aldehyde & Ketone forms:
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When Aldehyde reacts with 50% NaOH, this reaction is called as:
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Based on function, thyroxin can be classified as:
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Enzyme is a natural substance that:
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The word ‘RITUAL’ means:
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Choose the correct spelling:
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Choose the correct spelling:
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Choose correct option from the following: Finally the accused was found guilty the crime.
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Choose the correct spelling:
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Hundreds of years old palace could not withstand the of heavy rain:
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He began to the heap of corns very carefully.
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How cold the night is! Which kind of sentence is it?
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Identify the errors in the sentence to choose the correct option from below:
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It good players who bring good name to a country.
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I don’t think I be able to go.
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Ethics important for a peaceful and loving society.
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Engineers working on a new project for the last three days.
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The word ‘CREDENTIALS’ means:
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Identify the errors and choose the correct option:
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Identify the errors and choose the correct option:
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Choose the correct option: Negotiations between the two sides have .
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Choose the correct sentence:
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