Scientific Assistant (Biology) Question Paper and Answer Key (033/2019)

Question Paper Code: 1/2021/OL
Category Code: 033/2019
Exam: Scientific Assistant (Biology) NCA- SC)
Date of Test 02-03-2021
Department Kerala Police Service Forensic Science Laboratory

Question1:-Venous heart is the characteristic feature of
        Correct Answer:- Option-C

Question2:-Choose the organisms showing 'neoteny'
        A:-Oikopleura, Ambystoma
        B:-Doliolum, Uraeotyphlus
        C:-Ascidia, Latimeria
        D:-Necturus, Myxine
        Correct Answer:- Option-A

Question3:-'Ammocoetes' is the larva of
        Correct Answer:- Option-B

Question4:-The left-handed, Zig-Zag double helix DNA, with only minor grooves is
        D:-Both A-DNA and B-DNA
        Correct Answer:- Option-C

Question5:-'Hybridoma' is a hybrid cell produced by the fusion of __________ and __________.
        A:-T-lymphocyte and Macrophage
        B:-B-lymphocyte and Myeloma cell
        C:-Neutrophil and Tumour Cell
        D:-Cytotoxic T-cell and Myeloma cell
        Correct Answer:- Option-B

Question6:-'Bovine spongiform encephalopathi' is caused by
        Correct Answer:- Option-C

Question7:-Name the micro-organism used in the bioremediation of oil-spill.
        A:-Pseudomonas putida
        B:-Bordetella pertusis
        C:-Vibrio parahaemolyticus
        D:-Sterptococcus pyogenes
        Correct Answer:- Option-A

Question8:-Which among the following is an attenuated vaccine ?
        A:-Pertusis vaccine
        B:-Salk polio vaccine
        C:-Tetanus toxoid vaccine
        D:-Measles vaccine
        Correct Answer:- Option-D

Question9:-Cephalosporin controls bacterial growth by inhibiting _________ synthesis.
        B:-Cell wall
        C:-Plasma membrane
        Correct Answer:- Option-B

Question10:-Name the antibody which can pass through the placenta.
        Correct Answer:- Option-B

Question11:-Which among the following is NOT a transfection method ?
        B:-Shotgun method
        C:-Colony hybridization
        D:-Shotgun method
        Correct Answer:- Option-C

Question12:-Degeneration of genetic code is attributed to the
        A:-First member of codon
        B:-Second member of codon
        C:-Entire codon
        D:-Third member of codon
        Correct Answer:- Option-D

Question13:-In split genes, the coding sequences are called
        Correct Answer:- Option-C

Question14:-Genes which confer antibiotic resistance on bacteria are located on
        A:-Chromosomal DNA
        Correct Answer:- Option-B

Question15:-Which among the following is NOT a fibrillar protein ?
        Correct Answer:- Option-D

Question16:-Albinism is a congenital human disorder resulting from the lack of the enzyme
        D:-Xanthine oxidase
        Correct Answer:- Option-C

Question17:-The starting t-RNA of prokaryotes is loaded with
        C:-Formylated Methionine
        Correct Answer:- Option-C

Question18:-"Gene-battery model" of gene regulation in eukaryotes is proposed by
        A:-Jacob and Monod
        B:-Britten and Davidson
        C:-Beadle and Tatum
        D:-Kornberg and Ochoa
        Correct Answer:- Option-B

Question19:-The enzyme that removes the RNA-primer after DNA replication is
        A:-DNA polymerase-I
        B:-DNA polymerase-II
        Correct Answer:- Option-A

Question20:-DNA replication occurs in
        A:- 𝐺1 phase
        B:- 𝐺2 phase
        Correct Answer:- Option-C

Question21:-A nucleosome is made of
        C:-Histone wrapped over octameric core of nucleic acid
        D:-DNA wrapped over octameric core of histone
        Correct Answer:- Option-D

Question22:-Which among the following is NOT a continental Island ?
        A:-New Guinea
        Correct Answer:- Option-B

Question23:-The active secretion of some substances from blood to urinary tubule is known as
        A:-Urine concentration
        B:-Tubular re-absorption
        Correct Answer:- Option-D

Question24:-The light and dark bands (stripes) of muscle fibres are called _________ and ________ respectively.
        A:-Anisotropic bands and Isotropic bands
        B:-Isotropic bands and Anisotropic bands
        C:-Hensen's band and M-band
        D:-Hensen's band and Z-band
        Correct Answer:- Option-B

Question25:-The jumping of nerve impulses from one node to the next in medullated nerve fibre is called
        A:-Synaptic transmission
        B:-Inhibitory transmission
        C:-Saltatory transmission
        D:-Synaptic delay
        Correct Answer:- Option-C

Question26:-Which among the following is NOT a hypothalamic hormone ?
        Correct Answer:- Option-B

Question27:-The hormones secreted by thymus gland
        A:-Thymosin and Thymopoietin
        B:-Thymin-I and Thymin-II
        C:-HTH and THF
        D:-All the above
        Correct Answer:- Option-D

Question28:-Crossing-over and genetic recombination between adjoining non-sister chromatids occur during
        A:-Pachytene stage of first meiotic prophase
        B:-Zygotene stage of first meiotic prophase
        C:-Leptotene stage of first meiotic prophase
        D:-Diplotene stage of first meiotic prophase
        Correct Answer:- Option-A

Question29:-Edward's syndrome is the result of
        D:-Deletion of 4th or 5th chromosome
        Correct Answer:- Option-B

Question30:-The RNAs present in 80S Eukaryotes chromosomes
        A:-23S rRNA, 5S rRNA and 16S rRNA
        B:-28S rRNA, 5S rRNA, 5.8S rRNA and 18S rRNA
        C:-28S rRNA, 5S rRNA and 16S rRNA
        D:-23S rRNA, 5S rRNA and 18S rRNA
        Correct Answer:- Option-B

Question31:-Which among the following is known as "Portuguese -man-of war" ?
        Correct Answer:- Option-B

Question32:-Phylum 'ctenophora' is known as
        B:-Barrel-Jelly fish
        D:-Swimming Bells
        Correct Answer:- Option-A

Question33:-'Widal test' is used for the diagnosis of
        B:-Typhoid fever
        D:-Swine flue
        Correct Answer:- Option-B

Question34:-"Itai-Itai disease" is caused by
        A:-Mercury poisoning
        B:-Arsenic poisoning
        C:-Cadmium poisoning
        D:-Lead poisoning
        Correct Answer:- Option-C

Question35:-The formation of new species from ancestral species as a result of the geographical isolation of fragmentation of the breeding population is called
        A:-Peripatric speciation
        B:-Sympatric speciation
        C:-Artificial speciation
        D:-Allopatric speciation
        Correct Answer:- Option-D

Question36:-The selfless behaviour of an animal for the benefit of its conspecific kins is known as
        Correct Answer:- Option-B

Question37:-Name two 'Ramsar Sites' in Kerala.
        A:-Vembanad lake and Ashtamudi lake
        B:-Vembanad lake and Sasthamkota lake
        C:-Thattekkadu and Kumarakom bird Sanctuaries
        D:-Kadalundi community reserve and Mangalavanam
        Correct Answer:- Option-A

Question38:-The type of isomerism shown by Fumaric acid and Maleic acid are
        A:-Geometrical isomerism with maleic acid (trans-form) and Fumaric acid (cis-form)
        B:-Geometrical isomerism with maleic acid (cis form) and Fumaric acid (trans-form)
        C:-Optical isomerism with maleic acid (L-form) and Fumaric acid (D-form)
        D:-Optical isomerism with maleic acid (D-form) and Fumaric acid (L-form)
        Correct Answer:- Option-A

Question39:-The protein structure involving the interaction, orientation and organization of two or more polypeptide chains to form a functional proteins
        A:-Primary structure
        B:-Secondary structure
        C:-Tertiary structure
        D:-Quarternary structure
        Correct Answer:- Option-D

Question40:-The chemoreceptor found in gastropod molluscus is
        A:-Crystalline style
        Correct Answer:- Option-C

Question41:-The scientific method in which final conclusions and generalisations are drawn from specific observations and analysis of known facts
        A:-Inductive method
        C:-Deductive method
        D:-Constructive method
        Correct Answer:- Option-A

Question42:-Which among the following is a neutral stain ?
        A:-Janus Green
        B:-Methyl Green
        C:-Borax Carmine
        D:-Leishman's stain
        Correct Answer:- Option-D

Question43:-According to the Patent Act 1970 (Amended in 2005), the term of every patent granted in India is
        A:-15 years from the date of filing
        B:-10 years from the date of filing
        C:-50 years from the date of filing
        D:-20 years from the date of filing
        Correct Answer:- Option-D

Question44:-Choose the 'Nucleotide Sequence' databases.
        A:-EMBL, GenBank, NCBI
        B:-DDBJ, NCBI, PDB
        C:-Swiss Prot, EMBL, PDB
        D:-NCBI, MIPS, PIR
        Correct Answer:- Option-A

Question45:-The Nobel Prize 2020 winners for Chemistry
        A:-Louise Gluck, Roger Penrose
        B:-Paul R. Milgrom and Robert B. Wilson
        C:-Emmanuelle Charpentier and Jennifer A. Doudna
        D:-Reinhard Genzel and Andrea Ghez
        Correct Answer:- Option-C

Question46:-Write the scientific name of the fish known as "Miss Kerala".
        A:-Sahyadria denisonii
        B:-Labeo rohita
        C:-Poecilia reticulata
        D:-Danio rerio
        Correct Answer:- Option-A

Question47:-Name the technique for determining the sequence specificity of DNA-binding proteins.
        A:-DNA finger printing
        B:-DOT blotting
        C:-Northern blotting
        D:-DNA foot printing
        Correct Answer:- Option-D

Question48:-The group of genes that specify regions of the body plan of an embryo along the head-tail axis of animals.
        A:-TATA box
        B:-Hox genes
        C:-Pribnow box
        D:-GC box
        Correct Answer:- Option-B

Question49:-Which among the following is a pest of paddy ?
        A:-Cosmopolites sordidus
        B:-Rhynchophorus ferrugineus
        C:-Dicladispa armigera
        D:-Opisina arenosella
        Correct Answer:- Option-C

Question50:-In industrial fermentation, secondary metabolites are produced in _______ stage of microbial growth.
        C:-Lag phase
        Correct Answer:- Option-A

Question51:-A mixture of DNA lysate has been analysed for nucleotides. It has been found that the Percentage of Guanine in that mixture was 18%, what will be the percentage of Thymine in that mixture by considering Chargaff rules ?
        Correct Answer:- Option-C

Question52:-The 𝐶3 cycle has been often called an evolutionary flaw. What may be Plant Physiology basics the reason for saying so ?
I. The rubisco enzyme that carries out 𝐶3 cycle is equal affinity to Oxygen
II. The flaws in 𝐶3 cycle leads to Photorespiration which is less energy efficient
III. The statement is incorrect, 𝐶3 cycle has no flaw

Choose the correct statements
        C:-I and II
        Correct Answer:- Option-C

Question53:-Phylogenetic trees constructed from a Gene locus "A" have resulted in 4 different tree topologies.
I. Tree 1 with 5 changes
II. Tree 2 with 4 changes
III. Tree 3 with 6 changes
IV. Tree 4 with 7 changes

You are directed to select the tree having maximum parsimony. Which of the following statements is correct ?

        A:-All trees are equally acceptable hypothesis of evolution and tree 2 is the one with maximum parsimony
        B:-All trees are equally acceptable hypothesis of evolution and tree 4 is the one with maximum parsimony
        C:-Only tree 4 with maximum changes are accepted and is having maximum parsimony
        D:-None of these trees can be accepted as hypothesis and tree 4 is having maximum parsimony
        Correct Answer:- Option-A

Question54:-Which of these enzymes can be found associated with pyrenoids ?
I. Alpha Amylase
II. Rubisco
IV. Citric acid synthase
        C:-I and II
        D:-All of these
        Correct Answer:- Option-B

Question55:-Wood Wide Web is a term used to denote
        C:-Climbers and Lianas
        D:-None of these
        Correct Answer:- Option-A

Question56:-Pichia kudriavzevii is the teleomorph of the Candida Krusei, which of the following statements are true ?
I. Pichia Kudriavzevii and Candida Krusei are same organism and teleomorph is the sexual stage of an organism
II. Pichia Kudriavzevii and Candida Krusei are different organisms, teleomorph is different organism showing same morphology
III. Pichia Kudriavzevii and Candida Krusei are related organisms, teleomorph is different organism showing same physiology
        D:-None of these
        Correct Answer:- Option-C

Question57:-Root wilt is a serious disease causing havoc in Kerala coconut plantations.
        A:-The disease is caused by Plant hopper and lacewing bug
        B:-The disease is caused by Phytoplasma, Plant hopper and lacewing bug spreads the disease
        C:-The disease is caused by Phytoplasma Plant hopper spreads the disease
        D:-The disease is caused by Phytoplasma and spread by wind
        Correct Answer:- Option-B

Question58:-Which of this is a recently (in 2019) reported bryophyte from Kerala ?
        A:-Cololejeunea manilalia
        B:-Marchantia polymorpha
        C:-Riccia nilagirica
        D:-Riccia sahyadrica
        Correct Answer:- Option-D

Question59:-Which among the following is Not a class in the recent classification of Pteridophytes by Smith ?
        Correct Answer:- Option-D

Question60:-Archaeosperma arnoldii is a remarkable fossil found from the famennian of Penysylvania, USA. What makes this fossil remarkable ?
I. It is the 1st record of angiosperm fossil
II. It is the earliest ovuliferous structure due to the presence of cupules
III. It is indication of early seed habit due to the presence of Endosperm
Which of these statements are true ?

        B:-I and II
        D:-I, II and III
        Correct Answer:- Option-C

Question61:-Which of these plants yield an anticancer drug ?
        A:-Thuja plicata
        B:-Podocarpus wallichianus
        C:-Taxus brevifolia
        D:-Juniperus bermudiana
        Correct Answer:- Option-C

Question62:-Which of the following statements are true about R-Plasmids ?
I. It is extrachromosomal genetic material
II. It have genes encoding bacterial toxins
III. It is circular and confer resistance to antibiotics
IV. It can spread fast in bacterial populations
        A:-I and II
        B:-I and III
        C:-II and III
        D:-I, III and IV
        Correct Answer:- Option-D

Question63:-The 6th Mass extinction is called as
        A:-Holocene extinction
        B:-Devonian extinction
        C:-Cretaceous-tertiary extinction
        D:-Devonian extinction
        Correct Answer:- Option-A

Question64:-Consider the following type of secondary thickening in Xylem
I. Annular
II. Pitted
III. Helical
IV. Reticulate
Which is the correct order of progression ?
        A:-I, II, III and IV
        B:-II, I, IV and III
        C:-I, III, IV and II
        D:-IV, I, III and II
        Correct Answer:- Option-C

Question65:-P-Protein can be seen in
        A:-Phloem Parenchyma
        B:-Xylem Parenchyma
        C:-Sieve tube elements
        D:-Companion cells
        Correct Answer:- Option-C

Question66:-Replacing the dehydrating agent in sections with a solvent of paraffin is called clearing because
        A:-It clears alcohol from the sections
        B:-It makes the material brittle
        C:-Most clearing agents makes the sections more translucent
        D:-None of these
        Correct Answer:- Option-C

Question67:-The endometaphase can be seen in
        A:-Abnormal Mitosis in Tapetum
        B:-Metaphase without wall formation in Endosperm haustorium
        C:-Abnormal Metaphase in Endothecium
        D:-Abnormal Metaphase in Endosperm
        Correct Answer:- Option-A

Question68:-The speciation event due to founder effect in small populations is known by
        Correct Answer:- Option-D

Question69:-The primitive condition of apocarpy NOT seen in
        D:-All of these
        Correct Answer:- Option-C

Question70:-Which among the following is an Eponym ?
        A:-Oryza malampuzhensis
        B:-Rotala vasudevanii
        C:-Alternanthera sessilis
        D:-Narcissus pseudonarcissus
        Correct Answer:- Option-B

Question71:-Which among the following trait can be considered as a synapomorphy for eudicots ?
        A:-Two Cotyledons
        B:-Tricolpate Pollen
        C:-Reticulate Venation
        D:-Vascular Bundles arranged in a ring
        Correct Answer:- Option-B

Question72:-Which of these plants NOT belonging to the family Amaranthaceae (APG) ?
        Correct Answer:- Option-D

Question73:-In the families listed below 2 are closely related by phylogenetic terms.
I. Caryophyllaceae
II. Malvaceae
III. Capparidaceae
IV. Amaranthaceae
Whihc are they ?
        A:-II and III
        B:-III and IV
        C:-IV and I
        D:-I and III
        Correct Answer:- Option-C

Question74:-Which is NOT an accepted Acronym ?
        Correct Answer:- Option-D

Question75:-Which is an evidence for the concept of flower as a modified shoot ?
I.Reduction in Stamens with an increase in number of petals in cultivated roses
II. Gynandrophore of Gynandropsis
III. Foliar open carpels of Fabaceae
IV. Syconium of Ficus
        A:-I and II
        B:-I and IV
        C:-I, II and III
        D:-All of these
        Correct Answer:- Option-C

Question76:-The plant Agave sisalana has been cultivated and harvested for
        A:-Sisal Fiber
        B:-Sisal Liquer
        C:-Sisal Wood
        D:-Sisal Flower
        Correct Answer:- Option-A

Question77:-The haploid chromosome number of Rice is
        Correct Answer:- Option-C

Question78:-The TBGRI model of benefit sharing has been associated with which of the following ?
I. Kani Tribes
II.Trichopus zeylanicus
III. Forest Development
IV. Ethnomedicine
        A:-I and II
        B:-I and III
        C:-II, III and IV
        D:-I, II and IV
        Correct Answer:- Option-D

Question79:-The endemic plant that has been rediscovered after a period of 135 years from a sacred grove of Kerala
        A:-Madhuca diplostemon
        B:-Madhuca latifolia
        C:-Madhuca longifolia
        D:-Madhuca bourdillonii
        Correct Answer:- Option-A

Question80:-Find the Minor Forest Products (NWFP) from the list
I. Acacia torta
II. Adenanthera pavonina
III. Caesalpinia bonduc
IV. Aegle marmelos
        A:-I and III
        B:-I, II and III
        C:-I and IV
        D:-I, II, III and IV
        Correct Answer:- Option-D

Question81:-An international agreement that aimed to manage and reduce carbon dioxide emissions and greenhouse gases is
        A:-Rio Summit
        B:-Kyoto Protocol
        C:-Montreal Protocol
        D:-Stockholm Convention
        Correct Answer:- Option-B

Question82:-The objectives of carbon farming are
I. Lock carbon from atmosphere through farming
II.Reduce reliance on chemical fertilizers through carbon rich organic fertilisers
III. Increase the crop yield and food security
IV. Increase the farming of seaweeds
        A:-I and II
        B:-II and III
        C:-I and III
        D:-I only
        Correct Answer:- Option-D

Question83:-The fossil plant _______ can be seen in all continents and land masses that was part of the ancient Gondwana land which is regarded as a proof for plate tectonics.
        Correct Answer:- Option-B

Question84:-From the conditions listed below those that contributes to high risk of species extinction are
I. Long Life Span
II. Low Dispersal Ability
III. High Degree of Specialization
IV. Low Reproductive Ability
        A:-I, II and III
        B:-II, III and IV
        C:-III, IV and I
        D:-All of these
        Correct Answer:- Option-B

Question85:-An amino acid with a non polar side chain is
        Correct Answer:- Option-B

Question86:-You are tasked with cloning of a plant gene in bacterial systems and later its expression in cultured cells. Which type of vector you should select for easy cloning and expression ?
        A:-Phage Vector
        B:-Cosmid Vector
        C:-Shuttle Vector
        Correct Answer:- Option-C

Question87:-The 70S ribosomes that can be seen in Chloroplast and Mitochondria is
I. An evidence for Endosymbiont Hypothesis on origin of Eukaryotes
II. Prokaryotic ancestor of Chloroplast and Mitochondria
III. Less efficient in translation comparing to 80S ribosomes in the cytoplasm
        A:-I and III
        B:-II and III
        C:-I and II
        D:-I, II and III
        Correct Answer:- Option-C

Question88:-Arrange the following algae based on its evolutionary advancement of thallus
I. Volvox
II. Ulothrix
III. Chlamydomonas
IV. Ulva
V. Chara
        A:-I, II, IV, III, V
        B:-III, I, II, IV, V
        C:-IV, III, I, V, II
        D:-III, II, I, IV, V
        Correct Answer:- Option-B

Question89:-What properties of RNA support the hypothesis that it was the first self-replicating molecule in early evolution ?
I. It can transfer amino acids for protein synthesis
II. It can store and pass information
III. It can catalyse its own synthesis
IV. It can form 3D structures
V. It has catalytic activity
        A:-I, III and V
        B:-II, III and IV
        C:-I, II and III
        D:-II, III and V
        Correct Answer:- Option-D

Question90:-The small polar molecules, ions and macromolecules (proteins and RNAs) can travel between the nucleus and the cytoplasm through
        A:-Membrane Channels
        B:-Inter membrane transporters
        C:-Transporters like Kinesin
        D:-Nuclear pore complexes
        Correct Answer:- Option-D

Question91:-One among the following technique is a Taxon specific technique that can assist in identification of Taxon like species
        C:-DNA Barcoding
        D:-DNA Fingerprinting
        Correct Answer:- Option-C

Question92:-You are entrusted to analyse leaf sample for the presence of a protein followed by its structure determination. Which are the techniques you can use for these experiments?
I. Western Blotting
IV. X-Ray Crystallography
        A:-I, II and III
        B:-II, III and IV
        C:-I, III and IV
        D:-All of these
        Correct Answer:- Option-D

Question93:-Which of the following crops are sterile due to triploid chromosome number ?
I. Banana
II. Citrus
III. Watermelon
IV. Grapes
        A:-I and II
        B:-I and III
        C:-II and IV
        D:-III and IV
        Correct Answer:- Option-B

Question94:-Plants has evolved to overcome the affinity of Rubisco to Oxygen by spatial and time separation of carbon dioxide fixation from the vicinity of atmosphere having oxygen and carbon dioxide
        A:-C2 cycle is separation in space and CAM in time respectively
        B:-CAM is separation in space and C4 cycle in time respectively
        C:-C4 cycle is separation in space and CAM in time respectively
        D:-C4 cycle is separation in space and C2 in time respectively
        Correct Answer:- Option-C

Question95:-A solution of pH 4 has been diluted by adding 40 ml of double distilled water to 10 ml of the solution. What will be the pH of the diluted solution ?
        Correct Answer:- Option-A

Question96:-The lab you are working is entrusting you to find out the molecular weight of a recently purified protein. Which of the following techniques available in the laboratory that you will be using for this task ?
        A:-Density Gradient Centrifugation
        D:-Isoelectric Focusing
        Correct Answer:- Option-A

Question97:-Name the software package that can be used to phylogenetic analysis of plants
II. Mesquite
III. Darwin
IV. Phylip
        A:-I, II and III
        B:-II, III and IV
        C:-I, III and IV
        D:-All of these
        Correct Answer:- Option-D

Question98:-CRISPR CAS 9, which won 2020 Nobel Prize is a
        A:-Gene Editing Technique
        B:-Gene Therapy
        C:-Gene Transfer Tool
        D:-RNA Interference Tool
        Correct Answer:- Option-A

Question99:-An algae that is commonly used for the production of single cell protein is
        Correct Answer:- Option-A

Question100:-The lichen group that forms the primary coloniser of a barren rock surface is
        Correct Answer:- Option-A

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