NEET UG

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Statement I :The codon ‘AUG’ codes for methionine and phenylalanine.Statement II :‘AAA’ and ‘AAG’ both codons code for the amino acid lysine.In the light of the above statements, choose the correct answer from the options given below. Answer: 4. Statement I is incorrect but Statement II is true Statement I is false: AUG codes only for methionine (it is also the start codon... Transcription, genetic code, translation, protein biosynthesis 1 answer
Two resistors of resistance, 100 Ω and 200 Ω are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in 100 Ω to that in 200 Ω in a given time is : Answer: 3. 2 : 1 In a parallel connection both resistors have the same voltage, so heat produced in a given time depends inversely on resist... Electrical energy and power 1 answer
As the temperature increases, the electrical resistance : Answer: 4. increases for conductors but decreases for semiconductors Resistance of a conductor rises with temperature, while that of a semic... Resistivity, conductivity and temperature dependence of resistance 1 answer
When two monochromatic lights of frequency, and /2 are incident on a photoelectric metal, their stopping potential becomes V_s/2 and V_s respectively. The threshold frequency for this metal is : Answer: 1. 3/2ν Einstein's equation: eV_s=h(ν-ν₀) , so stopping potential is proportional to (ν-ν₀) . Taking the ratio of the two cases: V_s... Einstein's photoelectric equation, particle nature of light 1 answer
The graph which shows the variation of the de Broglie wavelength (λ) of a particle and its associated momentum (p) is : Answer: 1. (graph) de Broglie wavelength is λ=h/p , so λ is inversely proportional to p . The graph of λ against p is therefore a rectangula... Matter waves, de Broglie relation 1 answer
Match List - I with List - II :List - I (Electromagnetic waves): (a) AM radio waves (b) Microwaves (c) Infrared radiations (d) X-raysList - II (Wavelength): (i) 10^-10 m (ii) 10^2 m (iii) 10^-2 m (iv) 10^-4 mChoose the correct answer from the options… Answer: 1. (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i) Recall typical wavelength ranges of the electromagnetic spectrum. AM radio waves:... Electromagnetic spectrum and applications 1 answer
Two hollow conducting spheres of radii R_1 and R_2 (R_1 >> R_2) have equal charges. The potential would be : Answer: 3. more on smaller sphere For a conducting sphere the potential is V=kQ/R , depending only on charge and radius, not on the material... Electric potential, potential difference, equipotential surfaces 1 answer
A biconvex lens has radii of curvature, 20 cm each. If the refractive index of the material of the lens is 1.5, the power of the lens is : Answer: 4. +5D Use the lens maker's formula: 1/f=(μ-1)(dfrac1R₁-dfrac1R₂) . For a biconvex lens R₁=+20 cm, R₂=-20 cm: 1/f=0.5(dfrac120+dfrac... Magnification, power of lens, combination of thin lenses 1 answer
If the initial tension on a stretched string is doubled, then the ratio of the initial and final speeds of a transverse wave along the string is : Answer: 4. 1 : √(2) Speed of a transverse wave on a string is v=√(T/μ) , so v∝sqrt T . v_i/v_f=√(T/2T)=1/sqrt2 , i.e. 1:sqrt2 . Option (4) i... Wave motion: longitudinal and transverse waves, wave speed 1 answer
The ratio of the radius of gyration of a thin uniform disc about an axis passing through its centre and normal to its plane to the radius of gyration of the disc about its diameter is : Answer: 3. √(2) : 1 Radius of gyration is k=√(I/M) . For a disc, about the normal axis through the centre I=1/2MR² ; about a diameter I=1/4M... Moment of inertia, radius of gyration, MI of simple objects 1 answer
Match List - I with List - II.List - I / List - II(a) Filariasis (i) Haemophilus influenzae(b) Amoebiasis (ii) Trichophyton(c) Pneumonia (iii) Wuchereria bancrofti(d) Ringworm (iv) Entamoeba histolyticaChoose the correct answer from the options given… Answer: 2. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii) Filariasis - Wuchereria bancrofti Amoebiasis - Entamoeba histolytica Pneumonia - Haemophil... Pathogens and parasites causing human diseases 1 answer
The Adenosine deaminase deficiency results into : Answer: 1. Dysfunction of Immune system Adenosine deaminase (ADA) deficiency damages lymphocytes and causes severe combined immunodeficiency... Applications in health: human insulin, vaccines, gene therapy 1 answer
Match List - I with List - II.List - I / List - II(a) Adaptive radiation (i) Selection of resistant varieties due to excessive use of herbicides and pesticides(b) Convergent evolution (ii) Bones of forelimbs in Man and Whale(c) Divergent evolution (i… Answer: 1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i) Adaptive radiation - Darwin's finches (iv) Convergent evolution - wings of butterfly and b... Adaptive radiation 1 answer
Assertion (A) :A person goes to high altitude and experiences ‘altitude sickness’ with symptoms like breathing difficulty and heart palpitations.Reason (R) :Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.In… Answer: 1. Both (A) and (R) are true and (R) is the correct explanation of (A) Altitude sickness gives breathlessness and palpitations at hi... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
During muscular contraction which of the following events occur ?(a) ‘H’ zone disappears(b) ‘A’ band widens(c) ‘I’ band reduces in width(d) Myosine hydrolyzes ATP, releasing the ADP and Pi(e) Z-lines attached to actins are pulled inwardsChoose the co… Answer: 1. (a), (c), (d), (e) only During contraction, thin filaments slide over thick ones. (a) H zone disappears - true. (b) A band widens... Locomotion: movement types, muscle contraction 1 answer
Match List - I with List - II.List - I / List - II(a) Scapula (i) Cartilaginous joints(b) Cranium (ii) Flat bone(c) Sternum (iii) Fibrous joints(d) Vertebral column (iv) Triangular flat boneChoose the correct answer from the options given below. Answer: 4. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i) Scapula - triangular flat bone (iv) Cranium - fibrous joints (sutures) (iii) Sternum - fla... Skeletal system, joints and disorders 1 answer
Which of the following is not a step in Multiple Ovulation Embryo Transfer Technology (MOET) ? Answer: 1. Cow is administered hormone having LH like activity for super ovulation In MOET, the cow is given hormone with FSH-like activity... Amniocentesis, infertility and ART (IVF, ZIFT, GIFT) 1 answer
Following are the statements about prostomium of earthworm.(a) It serves as a covering for mouth.(b) It helps to open cracks in the soil into which it can crawl.(c) It is one of the sensory structures.(d) It is the first body segment.Choose the corre… Answer: 1. (a), (b) and (c) are correct The prostomium is a lobe that covers the mouth, is sensory and helps in opening cracks in the soil.... Frog: digestive, circulatory, respiratory, nervous and reproductive systems 1 answer
Which of the following is not an objective of Biofortification in crops ? Answer: 2. Improve resistance to diseases Biofortification breeds crops for higher nutritional quality: more protein, vitamins, minerals and... Biocontrol agents and biofertilizers 1 answer
Match List - I with List - II.List - I / List - II(a) Aspergillus niger (i) Acetic Acid(b) Acetobacter aceti (ii) Lactic Acid(c) Clostridium butylicum (iii) Citric Acid(d) Lactobacillus (iv) Butyric AcidChoose the correct answer from the options give… Answer: 1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii) Aspergillus niger - citric acid (iii) Acetobacter aceti - acetic acid (i) Clostridium buty... Microbes in industrial production 1 answer
Identify the incorrect pair. Answer: 4. Drugs - Ricin Codeine is an alkaloid - correct. Abrin is a toxin - correct. Concanavalin A is a lectin - correct. Ricin is a toxi... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G_1 phase is 8, what would be the number of chromosomes after S phase ? Answer: 1. 8 The chromosome number does not change in S phase; only DNA content doubles, because each chromosome gets two sister chromatids... Cell cycle, mitosis, meiosis 1 answer
Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature ? Answer: 3. Diakinesis Terminalisation of chiasmata (chiasmata slide towards the ends of the bivalents) occurs in diakinesis, the last stage... Cell cycle, mitosis, meiosis 1 answer
The centriole undergoes duplication during : Answer: 1. S-phase Centrioles duplicate during the S phase of the cell cycle (in the cytoplasm, alongside DNA replication), so that two cent... Cell cycle, mitosis, meiosis 1 answer

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