UHS MDCAT 2019

Ester linkages occur in:

The finger like infoldings, which are formed by inner membrane of mitochondria, are called:

The main neurotransmitter for synapses is _, which lie outside the central nervous system.

The structure present in a eukaryotic cell but absent in prokaryotic cells is:

If water has a high latent heat of vaporization, how could this property of water be helpful to plants and animals?

Which cell organelle is responsible for protein modification?

Nowadays every newborn gets regular shots of vaccine for polio. It contains _ for polio to make a child immune against this disease.

Change in frequency of alleles that occurs by chance is called as:

Lipids contain double amount of energy as compared to the same amount of carbohydrates due to the presence of:

The phase of mitosis in which sister chromatids move towards opposite poles:

Starch is present in tubers, fruits, and grains but absent in animal cells. Instead, animals have a substance stored in liver and muscles known as:

Thin filaments of muscles contain _ chains of actin molecules.

The reflex action is the phenomena which only involves:

Complementary DNA molecule is:

Meselson and Stahl transferred few bacteria grown in N15 medium to N14 medium for replicating their DNA. What would be the result after two rounds of replication?

In an action potential, the permeability of sodium ions in the neurons increases due to:

In which situation are genes, are not assorted independently, during meiosis in a chromosome?

During spermatogenesis, the _, which are haploid cells eventually mature into spermatozoa/mature sperms.

Site of mRNA translation:

The photosynthetic pigments of plants are arranged as clusters in thylakoid membranes. The reaction centers of these clusters consist of _ molecules.

Acetylcholine and noradrenaline are two types of _ used in our nervous system.

The type of energy, reduced by the enzymes, for biological reactions to occur is called the:

The prokaryotes possess ribosome with larger subunit of:

Homozygous means:

Most proteins are made up of:

The route of urine excretion from kidney to outside of body is:

In genetics, the term locus refers to the _ of the gene on the chromosome.

Glycolysis takes place in the _ of cells.

If a carrier haemophilic female (XHXh) is married to a haemophilic male (XhY). What will be the ratio of the presence of haemophilia in the children? Select the best answer from the given options.

A disease caused by gradual breakdown of the thin walls of alveoli is:

Substances responsible for increasing the set point of the hypothalamus are called:

DNA polymerase enzyme for PCR is isolated from bacteria, Thermus aquaticus, because:

Which of the following photosystems is involved in cyclic photophosphorylation?

Which hormonal pair would maintain the endometrium and make it receptive for implantation of embryo?

The thick filaments, in a myofibril of muscles, are made of _.

If sequence in DNA is CCCTAGAG, then what would be the sequence in messenger RNA after transcription?

In chemiosmosis, the proton (H+) moves from _.

Microtubule subunits (for spindle fibers) are synthesized in _ phase.

How many molecules of ATP would be utilized for phosphorylation of one glucose molecule during glycolysis?

The function of calcium ions in muscle contraction is to:

A person was married to his cousin and both are heterozygous for Sickle Cell anemia. Among their four kids, what will be the proportion of homozygotes?

The major function of basophils is to:

Which enzyme is administered to the patients of Severe Combined Immunodeficiency Disease (SCID)?

Given below, is the diagram of a nephron without a vascular supply.What is the name of Part C?

Inside ovary, primary oocyte divides through first meiotic division, forming two haploid cells, the secondary oocyte and:

Genetic engineering has been successfully used to produce?

In plants, which sugar is transported from source to sink through sieve tubes?

Which of the following hormone stimulates the ovulation from the follicle into oviduct?

Which one is an example of a Nucleotide?

Four plants are present in different environmental conditions. Plant A is present in a warm climate with continuous rainfall, plant B is present in a cool forest, plant C is present in a warm climate with little breeze, while plant D is present in a warm climate with high wind speed. Which one of the above plants will have the highest rate of transpiration?

The protein coat of virus is called:

If stimulation is above _, impulses travel to the brain along the sensory neuron.

The covalent bond or bridge between two monosaccharides to form a disaccharide is called a:

The structure of a fibrous protein comprises of polypeptide chains in the form of:

Taxonomy includes the arrangement of organisms into different taxa. Which of the following represents the correct hierarchy of various taxa of classification?

The Plasmid pBR322 has antibiotic resistance genes for:

Which of the following blood vessels contain semilunar valves?

The main nitrogenous excretory product of humans is:

Water and Minerals move down their concentration gradient through plasmodesmata to cells of cortex, endodermis, pericycle, and then to sap in the xylem cells. This is also known as the:

If 15 um size object is observed under light microscope, using 5X eyepiece and 10X objective, its magnified image size will be:

A person got an infection, he became ill but then he survived. What do you think which of immunity he would have developed?

The nitrogen-containing bases in nucleotide are of two types; Purines and P_yrimidines. The purines bases are:

The process in which a complementary copy of the code from a gene is produced by RNA Polymerase in the nucleus:

Among the following, which cellular organelle contains circular DNA, similar to those found in bacteria?

The following flowchart depicts the steps of the Calvin Cycle. Which option, according to you, fits in as the correct answer of the missing step?

Given figure shows:

Xerophytes have small, thick leaves to:

Passive processes for the movement of molecules across cell surface membrane are:

During the G₂ phase:

During inspiration, the space inside the chest cavity is increased due to:

A student of chemical engineering mistakenly engulfed the toxic compound "A" which was a potent inhibitor of a certain enzyme. He was immediately brought to a hospital where the doctor injected, intravenously, substrate "B" to minimize the toxic effect of Compound A. His life was saved from serious damage. The treatment method shows that compound A was a _ inhibitor.

Which is an example of a Disaccharide?

In glycine, R is _.

Sequence of amino acids, in a polypeptide chain of protein molecule, corresponds to the sequence of nucleotides on mRNA for that protein. If the reading frame of mRNA for a human protein is 993 nucleotides, including a stop codon at the end, how many amino acids would be incorporated in the polypeptide chain?

Blood group AB is an example of _ .

As a result of replication, parental DNA would become completely dispersed and that each strand of all the daughter molecules would be a mixture of old and new DNA. This is called as:

Smooth endoplasmic reticulum is responsible for the metabolism of:

Among followings, _ enzyme is naturally found in human immunodeficiency virus (HIV).

The average atomic mass of Boron is 10.8. It has two isotopes of masses 10 and 11 respectively. What is the percentage of isotope with the average mass of 10?

Which one of the following compounds is an additional polymer?

Which of the following compounds will give a secondary alcohol after reaction with NaBH₄?

Select the reagent X from the following choices for this conversion:

The pH of 10^-2 M aqueous solution of sodium hydroxide is:

Ketones can be made by oxidation of:

In the following reaction sequence, product D will be:

Copper is a typical transition metal. Its atomic number is 29. In which oxidation state does it have a partially filled orbital in d-subshell?

The decomposition of phosphorus pentachloride in the presence of moisture takes place by the following mechanism. The rate equation for this reaction will be:

Which type of reaction takes place when a carbonyl compound is treated with a mixture of NaCN and an acid?

An intermolecular force of attraction X is relatively stronger than the other intermolecular forces. It stabilizes alpha-helix and beta-pleated sheets of proteins. The double helical structure of DNA is also stabilized by this force of attraction. Identify X:

Which of the following molecule shows cis-trans isomers?

Disposable cups are made of a polymer 'polystyrene'. Polystyrene is:

Which of the following element is not present in halogens?

Chlorofluorocarbons (CFCs) are important compounds that are used as refrigerants, but these are also responsible for Ozone layer depletion. If a Chlorofluorocarbon CFCl₃ is present in stratosphere, which of its reaction intermediates are actually responsible for the breakdown of the ozone molecule?

Which of the equations shows ‘twice’ the enthalpy change of neutralization as the following equation: HCl + NaOH → NaCl + H₂O

Which two elements are isotopes?

Carboxylic acids can be reduced to corresponding alcohols. Which of the following reagent can be used for this purpose?

Which enthalpy change is relevant in the following process Na_(s) → Na _(g) ΔH = +107

Ionization energy decreases down the group, from top to bottom, due to:

The K_a values of HCI, CH₃COOH, HF, and H₂SO₄ are 10⁷, 1.85 x 10^-5, 6.7 x 10^-5 and 10² respectively. The decreasing order of acidic strength is:

In contact process, to which substance are adequate quantities of water added to convert it to sulphuric acid?

For the following equilibrium reaction, when the forward reaction is exothermic; an increase in temperature shifts the equilibrium position towards the left. What will occur in that scenario? 2SO₂ + O₂ ⇌ 2SO₃

Which one of the following molecules has sp³ hybridization?

During stoichiometric calculations, which of the following laws must be followed?

Nitriles (RCN), on hydrolysis, in the presence of a mineral acid yield:

Alkenes undergo:

Treatment of ethene with cold sulphuric acid, followed by reaction with boiling water, yields:

How many moles of Calcium Carbonate are present in 1.75 kg of Calcium Carbonate? (Ar of Ca = 40, Ar of C = 12, Ar of O = 16)

Which balanced chemical equation show the formation of ethanoyl chloride using thionyl chloride?

All the collisions between the particles of gases are elastic in nature. What is meant by "Elastic Collisions"?

Which of the following reagent is required for preparation of acyl chloride (CH₃COCl) from ethanoic aicd?

Identification tests for functional groups of organic compounds are associated with specific observations. Tollen’s reagent is an ammoniacal silver nitrate solution, which is used for the identification of a functional group X with an observation O. Identify X and O.

Free Nitrogen and Oxygen are present in atmosphere but they do not react with each other under normal conditions because:

CFCs are organic compounds, that are derivatives of saturated hydrocarbons. They have high bond dissociation values therefore they are inert and non-toxic for living organisms.The word CFCs stands for:

According to Watson and Crick’s model of DNA, the DNA molecule consists of a double helix. What type of forces are responsible to keep two strands of DNA together?

Nitrogen has an atomic number of 7.Which of the following electronic configurations is of a nitrogen atom in the ground state?

Which of the following substances exhibits strong hydrogen bonding?

Aqueous solutions of Iodine and Sodium hydroxide were mixed in a round bottom flask at 70 C. Following chemical reaction was carried out. 3I₂ + 6 NaOH → NaIO₃ + NaI + H₂O.This reaction is termed as:

Which of the following is the electronic configuration of ?

The number of moles of water in 1 kg ice are:

Which of the following set constitutes of all the molecules and ions of non-planar geometry?

The given diagram shows the enthalpy changes during a chemical reaction. What type of reaction is this?

What is the measure of activation energy in an endothermic reaction?

Maleic and Fumaric acid, both have chemical C₄H₄O₄. The structure of these acids is shown below. What type of isomers are these?

Amino acids are bi-functional compounds, with a general formula NH₂CH(R)CO₂H. A tripeptide is formed between Alanine (ala), Glycine (gly), and lysine (lys). There is no repetition of amino acid in this tri-peptide; suggest how many tri-peptides are possible?

If the energy of activation of a chemical reaction is very low, the rate of that chemical reaction is observed to be very high because?

Which of the following compounds is responsible for the depletion of ozone layer?

Oxidation number of particular element can be directly or indirectly inferred from its:

Which of the following reactions is used for the production of alcohols on industrial scale?

Solution contains 85.5g of sucrose (C₁₂H₂₂O₁₁) in 250 cm³. What is its molarity?

Which derivative of benzene shows maximum reactivity in electrophilic substitution reactions?

The names of functional groups in the following compound X are:

In the second period of elements, although oxygen lies next to nitrogen yet its ionization first energy is lower than that of nitrogen because?

The structure of Xenon trioxide is shown below: With reference to the valence shell electron pair repulsion theory (VSEPR), the shape of XeO₃ is:

Which of the following will give a positive test with Tollen’s reagent?

The range of the projectile depends upon the velocity of the projection and the angle of the projection i.e. 45. For a fixed velocity, when the angle of projection is larger than 45. Which of the following is correct?

The wavelength of the electromagnetic wave having frequency of 3 kHz will be?

An automobile is moving forwards with uniform velocity due to the force exerted by its engine. If the force is doubled with the velocity remaining constant, what happens to its total power?

Which of the following statement shows that no work is done?

If two objects of equal masses 'm' are moving towards each other with the same speeds 'v' then what will be the total final momentum after elastic head-on collision?

In double slit experiment, the fringe spacing of the diffracted rays increases when:

What is the quark composition of a Proton?

The sum of all forms of molecular energies (kinetic and potential) of a substance is termed as:

Molecules of a gas at constant pressure for a fixed amount of gas have average kinetic energy X. Increasing temperature from 27°C to 327°C, the average K.E. of molecules will become:

Kirchhoff's first law/rule corresponds to:

Minimum energy required to eject an electron from metal surface is called:

If we change the magnetic flux linking a coil by rotating the coil in a constant magnetic field, the rate of change of this flux is:

The area under the extension-load graph of an elastic material whose elastic limit has not been exceeded gives its:

What will be the expression for the observed frequency f0 , if the source is moving towards the stationary observer?

The direction of current through the load resistance of a full-wave rectification circuit:

A negligible small current between input terminals of the operational amplifier is because of:

Heavy nucleus of atoms go through fission so that they can:

A wire has a spring constant of 5 x 104 N m-1. It is stretched by a force to the extension of 1.4 mm. Calculate the strain energy stored in the wire.

An object is moving along a circular path of radius 4m. What will be its angular displacement if it moves 14 m on this circular path?

A copper wire has length L and cross-sectional area A. Its resistance is R. If we halved the length and halved the diameter of wire, then what will be the resistance of this wire?

If a conductor of length 7m is placed in a magnetic field of strength 0.3 T carrying current 1 A, parallel to the field. What will be the force, acting on it, due to this magnetic field?

In relation, which quantity is represented by λ?

Work done, due to centripetal force, for circular motion will be:

Electric field strength of a point charge is E and electric potential is V, at a distance 'r' from the point charge. What is the electric potential at a point for the same point charge where electric field strength is E/4?

Light, emitted by a single source, passes through 2 narrow slits 1.00 mm apart. The interference pattern is observed on a screen 200 cm away and the separation between the centers of adjacent bright fringes is 2.00 mm. What would be the wavelength of the light?(u= micro)

Calculate the energy of a photon, with a frequency of 3.0 x 1018 H_z.(h = 6.63 x 10-34)

The path difference for the destructive interference can be written as:

Calculate the rate at which energy is transferred by a 220 V mains supply, which provides a current of 0.1 A to an LED?

An alternating voltage V (in volts) is represented by the equation: V = 300 sin(100πt) . What is the value of “f” for this voltage?

A particle, carrying a charge of 5e, falls through a potential difference of 25 V. What would be energy acquired by the particle in ‘J’.

The unit of magnetic flux density is the tesla, ‘T’. It can also be expressed as:

If we give a direct current to the transformer’s primary coil, then there will be:

Electric field strength at a point between oppositely charged plates is 'E'. If the distance between plates is reduced to half, what will be the new value of electric intensity?

The horizontal component of Earth magnetic flux density is 1.8 x 10-6 T. The current in a horizontal cable is 160 A. Calculate the maximum force per unit length?

The value and units of the Planck constant ‘h’ can be expressed as:

When the length of a simple pendulum is doubled, the ratio of its new time period to old time period is:

For projectile motion, in the absence of air resistance:

In simple harmonic motion, acceleration will be maximum, when the object is at:

The culpable child _ some words to her mother for pardoning his delinquency.

She was feeling _ even after five hours of the surgery.

The parents were stunned when they saw that children had created complete _ in the bedroom.

I _ caution in interpreting these results.

They sometimes feel a _ for the mountains and the sea.

The new teacher showed no _ about hitting the students.

The accident happened due to the driver’s _ .

In the following question, four alternative sentences are given. Choose the CORRECT option.

In the following question, a sentence is given with blanks to be filled in with an appropriate word. Four alternatives are suggested. Choose the correct alternative, out of the four as your answer.Ravens appear to behave _, actively helping one another to find food.

The prince abdicated the crown and returned to his castle. Abdicated means:

SPOT THE ERROR: In the following sentence, some segments of the sentence are underlined. Your task is to identify that underlined segment of the sentence, which contains the mistake that needs to be corrected. Social and economic progress, good governance takes time to establish.

SPOT THE ERROR: In the following sentences, some segments of the sentence are underlined. Your task is to identify that underlined segment of the sentence, which contains the mistake that needs to be corrected.

Choose the correct option

When I was young, I — run very fast.

She has a driving license. She — drive the car on the motorway.

— you turn down the music a bit, please?

You — reduce the speed. There is a speed limit.

The old garage suddenly collapsed one day. Luckily, the owner wasn’t there or he — received serious injuries.

You — drive fast. We have plenty of time.