Category: TIFR Previous Year Question Papers 2023 Biology With Answer Key Download

Category: TIFR Previous Year Question Papers 2023 Biology With Answer Key Download

TIFR Previous Year Question Papers 2023 Biology With Answer Key Download

Scientists measured the resting metabolic rate (RMR) of males and females from 12 different insect species. Given the results shown in the figure, which statement is correct? Circles with a cross inside indicate species that eat plants. In each species, males and females have similar RMR Plant-eating insects have higher RMR than other insects Male and female RMR is not correlated Males generally have higher RMR than females

Insect RMR Study

The mutation rates due to replication error in strains A and B of Escherichia coli are 10-8 and 10-9 per genome per generation respectively. Starting from 10 cells of each strain, the bacteria were cultured for varying amounts of time as given below. Both strains divide once in 20 minutes. In which of these cases would both cultures have at least one mutant bacterium? Strain A- 520 minutes Strain B- 400 minutes Strain A- 120 minutes Strain B- 240 minutes Strain A- 560 minutes Strain B- 360 minutes Strain A- 500 minutes      Strain B- 560 minutes

E. coli Mutation Rates

You unearth a fossilised skull. Your initial investigation suggests a reptile, likely a dinosaur, that had strong jaw muscles. What feature led to you that conclusion? The presence of a sagittal crest at the top of the skull The length of the maxilla The shape and number of molars Evidence of torsional strain on the tripus bone

How to Identify Strong Jaw Muscles in Dinosaur Fossils

A newly discovered extra-terrestrial organism was found to contain proteins that are made up of 75 different amino acids. Assuming that one codon codes for a unique amino acid, which of the following is possibly correct about its DNA and codons? The DNA could be composed of 4 bases and the organism has a triplet codon. The DNA could be composed of 3 bases and the organism has a triplet codon. The DNA could be composed of 3 bases and the organism has a quartet codon. The DNA could be composed of 2 bases and the organism has a quartet codon.

Alien Genetic Code

A trihybrid test cross (order of loci unknown) produced progeny classes as follows: 35 AbC/abc, 37 aBc/abc, 8 ABc/abc, 10 abC/abc, 3 ABC/abc, 5 abc/ abc, 1 Abc/abc, 1 aBC/abc. The gene order is CBA BAC BCA CAB

Trihybrid Test Cross Gene Order

Which of the following statement is correct, given this phylogeny of four species? A has gone extinct A is more closely related to C than D D evolved from C B, C and D shared a common ancestor

Evolutionary Relationship of Species

X-linked recessive disorders are most commonly exhibited by ---- because------- females, because they have two X-chromosomes and are therefore more likely to inherit one with a disease males, because they have only one X-chromosome females, because one of their X-chromosomes is deactivated both males and females, because of equal penetrance

Why Are X-linked Recessive Disorders Most Commonly Exhibited by Males?

The stages of the cell cycle for a cultured mammalian cell line require the following periods of time: G1 = 8 hr, S = 5 hr, G2 = 1 hr, M = 1 hr. An asynchronous culture of these cells is exposed to radioactive thymidine for five minutes and then allowed to continue to grow in nonradioactive medium. The figure below shows the results. If the length of G2 were increased by one hour, which of the following statements would be true regarding the slope of the line from the first appearance of labelled mitotic cells until all cells are labelled? It would increase. It would decrease. It would stay the same. It would switch from a positive to a negative slope

Effect of G2 Phase Length on Labelled Mitotic Cells in Mammalian Cell Cycle

Which of the following statements explains why net primary productivity is higher near the tropics? More predators in the tropics kill herbivores, increasing plant growth in the tropics Increased species diversity results in increased plant growth Availability of newly weathered inorganic nutrients Water and warm temperatures in the tropics promote photosynthesis

Net Primary Productivity Higher in Tropics

Human DNA contains 18% C on a molar basis. What is the mole percentage of A, G, and T respectively? 32, 18, 32 18, 32, 32 32, 32, 18 Insufficient information to calculate

Chargaff’s Rules Explained

You synthesise a short peptide [AMxVFxGNxM], where x is any amino acid with a charged side chain. How many possible peptides can be synthesised? 15 243 125 27

How Many Possible Peptides for [AMxVFxGNxM] with Charged Side Chains?

Amino acids have different chemical properties that determine whether they are found on the surface of globular proteins. Which of the following series of amino acids is ordered according to how likely it will be found on the surface of a protein: Arginine > Leucine > Aspartic acid> Phenylalanine Threonine > Arginine > Phenylalanine > Asparagine Arginine > Phenylalanine > Threonine > Glycine Aspartic acid > Threonine > Leucine > Phenylalanine

Amino Acids on Protein Surfaces

Which of the following techniques can be used to identify a post-translational modification such as phosphorylation or methylation of a protein, and the residue where it is modified? 2-D gel electrophoresis Size exclusion chromatography Mass spectrometry UV-Visible spectroscopy

Identifying Post-Translational Modifications

In a human family, the father and the mother are carriers for an autosomal recessive disease. One of their sons is phenotypically normal. What is the probability that this son is also a carrier? 1/2 1/3 1/4 2/3

Autosomal Recessive Carrier Probability

The Michaelis-Menten equation can be represented as follows: v = Vmax. [S] 1 + [S]/Km For an intracellular enzyme to function optimally, which of the following statements regarding intracellular substrate concentration is true? The intracellular substrate concentration should be greater than the Km of the enzyme. The intracellular substrate concentration should be significantly lower than the Km of the enzyme. The intracellular substrate concentration is independent of the Michaelis constant Km. The intracellular substrate concentration should be approximately the same as that of the Km.

Optimal Intracellular Substrate Concentration

If a branched polysaccharide (e.g. amylopectin) has 7 branch points, how many free -OH ends are available for reduction? 7 1 6 0

Amylopectin Branch Points

A tyrosine-to-histidine mutation in the active site of an enzyme significantly affects its activity. The reaction is likely to be Acid-catalysed Base-catalysed Free radical-catalysed None of the above

Tyrosine to Histidine Mutation in Enzyme Active Site

Select one of the below sets in which all the molecules show a microwave rotational spectrum? H2, CH4, SF6 HCl, CH3Cl, CH2Cl2, H2O H2, HCl, CH4, CH3Cl CH2Cl2, H2O, SF6

Microwave Rotational Spectrum

If you have a polypeptide of size 11 kilo Daltons, what would be the mass of the open reading frame that codes for the polypeptide? The average mass of an amino acid and a nucleotide is considered to be 110 Daltons and 330 Daltons, respectively. 99990 99000 90900 99900

Polypeptide 11 kDa to ORF Mass

Phosphoric acid is tribasic with three pKa values of 2.14, 6.86, and 12.4, respectively. The ionic form of the acid that predominates at pH 3.2 is: PO43- HPO42- H2PO4- H3PO4-

Phosphoric Acid Predominant Form at pH 3.2

When the velocity of enzyme activity is plotted against substrate concentration, which of the following is obtained? Hyperbolic curve Parabola Straight line with positive slope Straight line with negative slope

Enzyme Velocity vs Substrate Concentration

20 μl of a 10 mg/ml solution of protein A (molecular weight 10 kDa) is added to 20 μl of a 10 mg/ml solution of protein B of molecular weight 20 kDa. What is the molar ratio of the two proteins (A:B) in the mixture? 1:1 2:1 1:2 2:2

Protein Molar Ratio Calculation

The melting temperature of a human protein is 33 °C in 100 mM sodium phosphate buffer at pH 6.5. What should the predominant conformation of the protein in the same buffer at physiological temperature conditions be? disordered α helical β sheet Mixture of alpha helix and beta sheet.

Protein Conformation at Physiological Temperature

Among the following, the one that gives a positive Iodoform test upon reaction with I2 and NaOH is:

Positive Iodoform Test

Which statement is true for the following chemical reactions? CuCO3 + heat → CuO + CO2 CuO + SnO → Cu + SnO2 CO2 is oxidised and SnO2 is reduced CuCO3 is oxidised and CuO is reduced CuO is oxidised and SnO is reduced SnO is oxidised and CuO is reduced

CuCO3 Decomposition and CuO SnO Reaction

The structure of nitrous oxide (N2O) can best be described by a resonance of two structures. The hybridization of nitrogen atoms in the two resonance structures are: both sp one sp another sp3 both sp2 one sp another sp2

Nitrous Oxide N2O Resonance Structures Hybridization

The Pauli spin matrices are defined as Which of these matrices has an eigenvector [1 -1]T? σx σy σz None have real eigenvectors.

Which Pauli Spin Matrix Has Eigenvector [1 -1]ᵀ?

Elon Musk goes cycling on the moon, where there is no air resistance. He finds a hill which has a nice smooth slope on one side, and a cliff on the other. If he jumps off the cliff his speed is greater that when he rides to the bottom of the slope, even though the starting height, and therefore potential energy is the same. His cycle has no friction. What is the explanation? The conversion of potential energy is more efficient if the resulting kinetic energy is along the same vector as the force due to gravity. The distance travelled down the slope is greater, so it takes longer, so the final speed is slower. The gas in his space suit applies friction even though the cycle has none. The wheels of the bicycle acquire kinetic energy when he rides down the cliff.

Elon Musk Cycling on the Moon

I have two identical glass beakers, X and Y, full of water. I introduce a concentrated drop of ink into each beaker. I stir beaker Y until the ink concentration is uniform. What can you say about the diffusive motion of the ink molecule? The molecule diffuses with the same diffusion coefficient in both X and Y. The molecule diffuses in X but not in Y. The molecule diffuses in Y but not in X.The molecule diffuses at the site of the original droplet but not close to the boundary.

Ink Diffusion in Water Beaker

A bacterium is swimming in an isotonic medium. I now add NaCl to a concentration of 100 mM. Which of the following is true? The osmotic pressure points inward but the water flows outward The osmotic pressure points outward so the water flows outward The osmotic pressure points inward so the water flows inward The osmotic pressure points outward but the water flows inward

Bacterium Osmotic Pressure NaCl Effect

A seagull flying 30 metres above the ocean spots a fish swimming 6 metres below the surface. The seagull folds its wings and falls to catch the fish. What is the velocity of the seagull when it hits the surface of the water? Assume no air resistance. 27.5 m/s 24.25 m/s 11 m/s 588 m/s

Seagull Physics Problem

11 balls have radii X cm, X+1 cm, …, X+10 cm. Which of the following is true about the volumes of these balls? The mean is equal to the median. The mean is greater than the median. The mean is less than the median. The relative order of mean and median depends on the value of X.

Mean vs Median in Volumes of Balls with Radii X to X+10 cm

The wheels on a drag racing car have a higher diameter at the end of a race than at the beginning. Which of the following is the least important factor contributing to this? The weight of the car is reduced due to fuel consumption. The tires heat up so the air inside expands. The tires rotate rapidly so the centrifugal force stretches them. Due to rubber fatigue the stiffness of the rubber decreases.

Why Drag Racing Tires Grow in Diameter

Evidence for the expansion of the universe comes from the observation of light from distant galaxies. What is this observation? Light from distant objects is red shifted More distant pulsars have a lower orbital frequency Light from other galaxies is focused by gravitational lensing The number of stars per volume drops at greater distances

Universe Expansion Evidence

Reaction P has ΔH0 while reaction Q has ΔH>0 and ΔS>0. Which of the following is true? Both P and Q are spontaneous at all temperatures because entropy increases. P is spontaneous at all temperatures but Q is spontaneous only at high temperatures. P is spontaneous only at high temperatures but Q is spontaneous at all temperatures. Both P and Q are spontaneous only at high temperatures

Reaction Spontaneity: ΔH and ΔS Signs Explained

A bullet with the same density as water is shot straight down into a very deep water tank. What happens after sufficient time? The bullet eventually comes to a halt at an intermediate depth. The bullet eventually falls to the bottom of the tank The bullet initially moves down but eventually floats to the surface. The bullet eventually oscillates between two depths.

Bullet Shot into Water Tank

A decibel is a measure of The ratio of sound amplitude to sound frequency The ratio of a pure tone to the background noise The frequency of sound The amplitude of sound

What is a Decibel?

What is the value of the current I given below? 0.01 A 0.03 A 0.02 A 0.04 A

Find the Current in a Circuit Using Series and Parallel Resistors

Which of the following equations best represents the graph shown below? Y = X2 Y = ex Y = logX Y = X1/2

Which Equation Shows Exponential Growth?

An electric circuit has two parallel plate capacitors (C1 and C2) in series. Both capacitors have the same dielectric and inter-plate distance, but the plates in C1 have a higher surface area compared to those in C2. Once fully charged, which of the two capacitors will have a higher voltage drop? C1 C2 The capacitor which is closer to the power supply The capacitor which is further from the power supply

Capacitors in Series

The diagram below represents a periodic wave. Which point on the wave is 90° out of phase with point P? A B C D

Which Point on the Periodic Wave Is 90 Degrees Out of Phase with Point P?

Toxoplasma is a parasite known to induce behavioural changes in mice, such as making them less fearful of cats. About 30-70% of humans are thought to be infected by Toxoplasma. A study was conducted to determine if reckless driving leading to motor accidents could be due to toxoplasma infection (Flegr et al 2002) and the following data were obtained: Seroprevalence indicates the presence of antibodies to Toxoplasma in the blood sample taken from the subjects. Controls were healthy individuals not involved in traffic accidents. Based on the above data, which of the following statements can be made? Toxoplasma infection causes humans to get into accidents There is no relationship between toxoplasma infection and accidents III. Toxoplasma infection is correlated with an increased risk of accidents I only II only III only I and III only

Does Toxoplasma Infection Increase the Risk of Road Accidents?

The Malabar carnation has red and white flowers. You suspect that sunbirds, which are diurnal, pollinate the red flowers, whereas the nocturnal hawkmoth pollinates the white ones. To show this you cover the red flowers at night and white ones during the day. All flowers become pollinated. What additional experiment can you do to support your claim? Set up a red and white Malabar carnation at opposite ends of a darkened flight arena to determine the flower preference of a sunbird Set up a red and white Malabar carnation at opposite ends of a well-lit flight arena to determine the preference of a sunbird Cover red flowers during the day and white flowers during the night and determine pollination Cover only white flowers and determine the colour of the resulting progeny.

Malabar Carnation Pollination

The Arctic tern is one of the fastest long-distance migratory birds with them migrating from the Arctic to the Antarctic pole and back every single year, which is about 90000 km in total. On average, these birds fly at the rate of about 40 km/hr, which of the following is true? The birds take ~45 days to complete one-half of the journey. The birds complete ~65% of one-half of the journey in a month. III. This is equivalent to Usain Bolt completing one-half of the Arctic-Antarctic journey in ~50 days at his 100-metre world record pace, which he completed in 9.58 seconds. I and II only II and III only I and III only All three statements are correct 

Understanding the Arctic Tern’s Incredible Migration

If a cat's pupils are circular, it is likely that It is looking at a fire It is walking in darkness It is pleading for food It is about to sleep

Why Are Cat Pupils Circular in Darkness?

Garima started a business with a personal investment of INR 3000. After 3 months Ridhima joined the same business and invested INR 2000. After some more time Badima joined the business with INR 1500. At the end of the year, the profit was 16000 and the share of Badima was INR 1600. How many months did Badima invest in the business? 3 5 4 7 painted all over. Assuming 1 litre of paint covers 6 square meters, how many litres of paint will be required to paint the drum? 132 litres 22 litres 20 litres 125 litres

Badima Investment Duration

A large sealed drum with a radius of 1 m and a height of 20 m, needs to be painted all over. Assuming 1 litre of paint covers 6 square meters, how many litres of paint will be required to paint the drum? 132 litres 22 litres 20 litres 125 litres

How Much Paint Is Needed to Cover a Sealed Drum?

8.Electric cars are considered more eco-friendly because: They do not cause air pollution They are built from bio-degradable parts They can carry more people They are cheaper

Why Electric Cars Are Considered More Eco-Friendly

7.Consider the following data as a sample. 15, 15, 33, 17, 30, 30, 20, 60, 45, 15 If each data value is increased by 5, what is the effect on the mean and standard deviation? Both the mean and the standard deviation increase by 5. The mean remains the same, but the standard deviation increases by 5. The standard deviation remains the same, but the mean increases by 5. Both the mean and the standard deviation remain the same

Effect on Mean and Standard Deviation When Adding 5 to Each Data Value

6.Avni has 8 favorite paintings but only 2 wall hooks where she can hang them. In how many different ways can she hang the paintings? 32 56 16 64

Avni 8 Paintings 2 Hooks

5.Where would the graph of y=x^2 and y=x^3 intersect? At x = -1 At all x>1 At x=0 and x=1 At all points between x=0 and x=1

Graph y=x² y=x³ Intersection Points

Kleiber’s law states that for a number of animal species, the metabolic rate, scales as the 3/4th power of its mass. Thus, a cat that weighs about 80 times more than a mouse: consumes about 27 times the energy of the mouse. consumes about 1/27 times the energy of the mouse. consumes as much energy as the mouse. consumes about 60 times the energy of the mouse.

 Kleiber’s Law: Metabolic Rate Scales as 3/4 Power of Mass

A badminton tournament has 128 participants and needs to produce just one winner. In each match, only the winner goes to the next round and plays with one of the other winners. This proceeds till ultimately there is only one winner. How many matches will a person need to reach the semi-finals? 8 7 6 5

How Many Matches to Reach Semi-Finals in 128-Player Badminton Tournament?

2.A bat echolocates and receives an echo 10 milliseconds later. Assuming a speed of sound in air of 340 m/s, how far away is the object? 3.4 m 1.7 m 6.8 m 5.1 m

Bat Echolocation Distance Calculation

In a skewed distribution with a long right tail like the distribution of annual incomes in most developing countries, which of the following statements is true? mean

Skewed Distribution Long Right Tail

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