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3 questions

Identify the basic amino acid from the following. Answer: 3. Lysine Lysine has an extra amino group in its side chain, so it is a basic amino acid (like arginine and histidine). Glutamic aci... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Which one of the following is the most abundant protein in the animals ? Answer: 2. Collagen Collagen is the most abundant protein in animals (and RuBisCO is the most abundant protein in the whole biosphere). Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Experimental verification of the chromosomal theory of inheritance was done by : Answer: 4. Morgan Sutton and Boveri proposed the chromosomal theory of inheritance. Its experimental verification was done by Thomas Hunt Mo... Chromosome theory, linkage and crossing over 1 answer
The number of substrate level phosphorylations in one turn of citric acid cycle is : Answer: 2. One In one turn of the citric acid cycle, one substrate level phosphorylation occurs: succinyl-CoA to succinate, forming GTP (whi... TCA cycle and electron transport system, ATP yield 1 answer
Dissolution of the synaptonemal complex occurs during : Answer: 3. Diplotene The synaptonemal complex forms in zygotene, is complete in pachytene and dissolves in diplotene, when homologues separa... Cell cycle, mitosis, meiosis 1 answer
Bilaterally symmetrical and acoelomate animals are exemplified by : Answer: 2. Platyhelminthes Platyhelminthes (flatworms) are bilaterally symmetrical and acoelomate. Ctenophora are radially symmetrical, Asch... Non-chordates up to phyla 1 answer
The body of the ovule is fused within the funicle at : Answer: 1. Hilum The ovule is attached to the funicle (stalk) at the hilum, where the body of the ovule fuses with the funicle. The micropyl... Flower structure, male and female gametophytes 1 answer
Goblet cells of alimentary canal are modified from : Answer: 2. Columnar epithelial cells Goblet cells, the mucus-secreting unicellular glands in the lining of the alimentary canal, are modifie... Animal tissues: epithelial, connective, muscular, neural 1 answer
Match the following columns and select the correct option.Column - I | Column - II(a) Eosinophils | (i) Immune response(b) Basophils | (ii) Phagocytosis(c) Neutrophils | (iii) Release histaminase, destructive enzymes(d) Lymphocytes | (iv) Release gra… Answer: 1. (a) (iii), (b) (iv), (c) (ii), (d) (i) Eosinophils: release histaminase and destructive enzymes, (a) - (iii). Basophils: release... Body fluids: blood, blood groups, coagulation, lymph 1 answer
The sequence that controls the copy number of the linked DNA in the vector, is termed : Answer: 2. Ori site The origin of replication (ori) is the sequence from where replication starts, and it controls the copy number of the li... Tools: restriction enzymes, vectors, host 1 answer
Match the following columns and select the correct option.Column - I | Column - II(a) Pituitary gland | (i) Grave's disease(b) Thyroid gland | (ii) Diabetes mellitus(c) Adrenal gland | (iii) Diabetes insipidus(d) Pancreas | (iv) Addison's disease Answer: 3. (a) (iii), (b) (i), (c) (iv), (d) (ii) Pituitary: diabetes insipidus (lack of ADH), (a) - (iii). Thyroid: Graves' disease (hypert... Hormonal disorders 1 answer
Select the correct statement. Answer: 1. Glucocorticoids stimulate gluconeogenesis. Glucocorticoids (cortisol) stimulate gluconeogenesis, so option 1 is correct. Glucagon... Endocrine glands and hormones, mechanism of action 1 answer
Match the following columns and select the correct option.Column - I | Column - II(a) Floating Ribs | (i) Located between second and seventh ribs(b) Acromion | (ii) Head of the Humerus(c) Scapula | (iii) Clavicle(d) Glenoid cavity | (iv) Do not conne… Answer: 4. (a) (iv), (b) (iii), (c) (i), (d) (ii) Floating ribs (11th and 12th) do not connect with the sternum: (a) - (iv). Acromion is a p... Skeletal system, joints and disorders 1 answer
Snow-blindness in Antarctic region is due to : Answer: 2. Inflammation of cornea due to high dose of UV-B radiation Snow-blindness is inflammation of the cornea caused by a high dose of U... Biodiversity: concept, patterns, importance, loss 1 answer
Identify a molecule which does not exist. Answer: 1. He ₂ A molecule exists only if its bond order (from molecular orbital theory) is greater than zero. He₂ : 4 electrons, σ1s²σ^*1s²... Molecular orbital theory, bond order, bond length, bond energy 1 answer
Find out the solubility of Ni(OH)_2 in 0.1 M NaOH. Given that the ionic product of Ni(OH)_2 is 2×10^-15. Answer: 1. 2×10⁻¹³ M In 0.1 M NaOH the common ion OH^- is already present, so the OH^- from Ni(OH)₂ can be ignored. mathrmNi(OH)₂ ⇌ Ni²⁺ + 2... Solubility product 1 answer
Identify the correct statements from the following :(a) CO_2(g) is used as refrigerant for ice-cream and frozen food.(b) The structure of C_60 contains twelve six carbon rings and twenty five carbon rings.(c) ZSM-5, a type of zeolite, is used to conv… Answer: 4. (c) and (d) only Check each statement. (a) Solid CO₂ (dry ice) is the refrigerant for ice-cream and frozen food, not the gas. The... Electronic configuration and general trends, Group 13 and 14 1 answer
Hydrolysis of sucrose is given by the following reaction.Sucrose + H_2O ⇌ Glucose + FructoseIf the equilibrium constant (K_c) is 2×10^13 at 300 K, the value of Δ_rG^ at the same temperature will be : Answer: 1. -8.314 J mol ⁻¹ K ⁻¹×300 K ×ln(2×10¹³) Standard Gibbs energy and equilibrium constant are related by Δ_rG^ominus=-RTln K . Substi... Gibbs energy change and equilibrium constant 1 answer
Identify compound X in the following sequence of reactions :Toluene (C_6H_5CH_3) Cl_2/h X [373\ K]H_2O Benzaldehyde (C_6H_5CHO) Answer: 3. Benzal chloride (C ₆ H ₅ CHCl ₂ ) Free-radical chlorination of the side chain ( Cl₂/hν ) replaces methyl hydrogens. To get an ald... Preparation, properties and reactions 1 answer
Identify the incorrect match.Name | IUPAC Official Name(a) Unnilunium | (i) Mendelevium(b) Unniltrium | (ii) Lawrencium(c) Unnilhexium | (iii) Seaborgium(d) Unununnium | (iv) Darmstadtium Answer: 4. (d), (iv) IUPAC temporary names come from the atomic number: un=1, nil=0, tri=3, hex=6. Unnilunium = 101 = Mendelevium. Match (a)... Modern periodic law and periodic table, s, p, d, f blocks 1 answer
An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is : Answer: 1. sqrt3/4×288 pm In a bcc unit cell atoms touch along the body diagonal. Body diagonal =sqrt3 a=4r . r=sqrt3/4a=sqrt3/4×288\ pm≈124... Metallic bonding and hydrogen bonding 1 answer
Which of the following set of molecules will have zero dipole moment ? Answer: 4. Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene Zero dipole moment needs a symmetric shape where bon... Electronegativity, Fajan's rule, dipole moment 1 answer
On electrolysis of dil.sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be : Answer: 2. Oxygen gas In dilute H₂SO₄ with inert Pt electrodes, water is oxidised at the anode more easily than the sulphate ion. Anode: 2H₂... Electrolytic and galvanic cells, electrode potentials 1 answer
Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give : Answer: 3. Tert. butyl alcohol Grignard reagents add to the carbonyl group. A ketone gives a tertiary alcohol after hydrolysis. mathrm(CH₃)₂... Aldehydes and ketones: HCN, NH3 derivatives, Grignard, oxidation, reduction (Wolff-Kishner, Clemmensen) 1 answer

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