50 Biology Question Answers- Multiple Choice type
The Department Kerala Police Service conducted Examination to select Director for Biology. Hte following Question Answers also useful for other Exams related to Bilogy
Total Number of Questiions- 100
Questions available in this page 50 (Remaining Questions also updated at www.questionpapersdownload.com
Question1:-Contribution of external factors in their descending order, in compressing the lymph vessel adn thereby causing pumping of lymph, are
A:-Contraction of surrounding skeletal muscles, movement of the part of the body, pulsation of arteries adjacent to the lymphatics, compression of the tissues by objects outside the body
B:-Compression of the tissues by objects outside the body, pulsation of arteries adjacent to the lymphatics, movement of the parts of the body, contraction of surrounding skeletal muscles
C:-Movement of the parts of the body, contraction of surrounding skeletal muscles, pulsation of arteries adjacent to the lymphatics, movement of the parts of the body, compression of the tissues by objects outside the body
D:-Movement of the parts of the body, pulsation of arteries ajacent to the lymphatics, contraction of surounding skeletal muscles, pulsation of arteries ajacent
to the lymphatics
Correct Answer:- Option-A
Question2:-Who proposed the five kingdom classification?
A:-Robert H. Whittaker
B:-Ernst Haeckel
C:-Aristotle
D:-Carl Woese
Correct Answer:- Option-A
Question3:-An ogive is a graphic presentation of the _______ distribution for a given
set of data.
A:-Frequency
B:-Relative frequency
C:-Percentage frequency
D:-Cumulative frequency
Correct Answer:- Option-D
Question4:-Following measure of dispersion is not based on all the observation of a
series.
(i) Standard deviation
(ii) Quartile deviation
(iii) Mean deviation
(iv) Range
A:-(i) and (iii)
B:-(ii) and (iv)
C:-All the above
D:-(ii)
Correct Answer:- Option-B
Question5:-Which among the following products from Kerala have registered under
Geographical indications recently?
(i) Kanthalloor Vattavada Veluthulli
(ii) Kodungallur Pottuvellari
(iii) Onattukara Ellu
(iv) Attappady Thuvara
A:-(i) and (ii) only
B:-(i) only
C:-(i) and (iii) only
D:-All the above
Correct Answer:- Option-D
Question6:-_____ is a semi quantitative technique for detecting radioactively
labelled molecules in cells, tissues or electrophoretic gels.
A:-Immunoblotting
B:-Mass spectrometry
C:-Autoradiography
D:-SDS-PAGE
Correct Answer:- Option-C
Question7:-Which of the following is not a characteristic of stem cells?
A:-Self-renewal
B:-Differentiation
C:-Apoptosis
D:-Proliferation
Correct Answer:- Option-C
Question8:-Which microscopy will be used to view the details of live, unstained
cells?
(i) Scanning Electron Microscope (SEM)
(ii) Transmission Electron Microscope (TEM)
(iii) Phase Contrast Microscope
(iv) Differential Interference Contrast (DIC) microscope
A:-(iii) only
B:-(i) and (ii) only
C:-(iii) and (iv) only
D:-(iv) only
Correct Answer:- Option-C
Question9:-Which of the following statements is not true about Agarose gel
electrophoresis.
(i) It uses electric current to separate DNA molecules.
(ii) Under electric field, DNA migrates from positive electrode to negative electrode.
(iii) If separates DNA by size.
(iv) Ethidium bromide is usually used to visualize DNA in gels.
A:-(iv) only
B:-(ii) only
C:-all above
D:-(iii) only
Correct Answer:- Option-B
Question10:-Visualization at the nanoscale can be achieved by
(i) Scanning Tunneling Microscopy
(ii) Atomic Force Microscopy
(iii) Nomarsky microscopy
(iv) All the above
A:-(iv)
B:-(ii) and (iii)
C:-(ii)
D:-(i) and (ii)
Correct Answer:- Option-D
Question11:-Monomers of Lactose are
A:-Two glucose molecules
B:-One glucose and one fructose
C:-One galactose and one glucose
D:-Two galactose molecules
Correct Answer:- Option-C
Question12:-Which are the three aminoacids with aromatic side chains?
A:-Valine, Leucine, Isoleucine
B:-Lysine, Arginine, Histidine
C:-Phynylalanine, Threonine, Tryphtophan
D:-Phynylalanine, Tyrosine, Tryphtophan
Correct Answer:- Option-D
Question13:-Select the incorrect statement about -helix from the following
A:-It was discovered by Linus Pauling in 1951
B:- -helix is left handed
C:-
-helix has 3.6 residues per turn
D:- -helix have an average length of ~12 residues
Correct Answer:- Option-B
Question14:-______ lipids are involved in the production of pain and fever.
A:-Prostaglandins
B:-Cerebrosides
C:-Gangliosides
D:-Sphingomyelins
Correct Answer:- Option-A
Question15:-The Watson-Crick model of DNA is based on X-ray diffraction data
provided by
A:-James Watson and Francis Crick
B:-Rosalind Franklin and Maurice Wilkins
C:-Oswald Avery, Colin MacLeod and Maclyn McCarty
D:-Erwin Chargaff
Correct Answer:- Option-B
Question16:-Select the correct statement from the following.
(i) In competitive inhibition, inhibiters bind to the active site of the enzyme.
(ii) Competitive inhibition can be overcome by a sufficiently high concentration of
substrate.
(iii) Noncompetitive inhibition cannot be overcome by increasing the substrate
concentration.
A:-(i) and (ii)
B:-(ii) and (iii)
C:-(iii) only
D:-(i, ii and iii)
Correct Answer:- Option-D
Question17:-Which of the following matches correctly?
(i) Devonian – Mammals
(ii) Pennsylvanian – Fishes
(iii) Jurassic – Reptiles
(iv) Tertiary – Amphibians
A:-(i) and (ii)
B:-(ii) and (iii)
C:-(iii) and (iv)
D:-(iii) only
Correct Answer:- Option-B
Question18:-The synthesis of sugars through the reversal of glycolysis is called
A:-Gluconeogenesis
B:-Glycogenesis
C:-Glycogenolysis
D:-Pentose phosphate pathway
Correct Answer:- Option-A
Question19:-Carrier proteins that transport a single type of molecule down its
concentration gradient via facilitated diffusion are called
A:-Antiporters
B:-Symporters
C:-Uniporters
D:-Proton pumps
Correct Answer:- Option-C
Question20:-Nucleosomes of eukaryotes contain _______ base pairs of DNA.
A:-147
B:-140
C:-90
D:-10-90
Correct Answer:- Option-A
Question21:-Turner syndrome is due to
A:-Trisomy
B:-Monosomy
C:-Polyploidy
D:-Duplication
Correct Answer:- Option-B
Question22:-CDK1/Cdc25C functions in
A:-The spindle assembly check point
B:-The spindle position check point
C:-The DNA damage checkpoint
D:-The intra S-phase checkpoint
Correct Answer:- Option-D
Question23:-Which among the following is not a promoter elements in eukaryotes
A:-TATA box
B:-Initiators (Inr)
C:-CpG islands
D:-Pribnow box
Correct Answer:- Option-D
Question24:-______ allows a tRNA to recognize more than one mRNA codon.
A:-Watson and Crick base pairing
B:-Wobble pairing
C:-D loop
D:-TψCG loop
Correct Answer:- Option-B
Question25:-Which of the following combination is correct about ribosome
composition?
(i) 50S(23S+5S), 30S(16S)=70S
(ii) 50S(23S+5.8S), 30S(16S)=70S
(iii) 60S(28S+5.8S+5S)+40S(18S)=80S
(iv) 60S(28S+5.8S+5S)+40S(16S)=80S
A:-(i)
B:-(iii)
C:-(i) and (iii)
D:-(ii) and (iv)
Correct Answer:- Option-C
Question26:-Inactive but stable component of the genome derived by mutation of
an ancestral active gene is called
A:-Gene family
B:-Psuedogene
C:-Multigene
D:-Transposons
Correct Answer:- Option-B
Question27:-The strength of relationship or association between a dependent and
an independent variables for a given population can be determined by
A:-Regression
B:-Correlation
C:-Standard deviation
D:- Goodness of fit
Correct Answer:- Option-A
Question28:-Poisson distribution is associated with
A:-Probability of success
B:-Probability of failure
C:-Probability of occurrence of rare events
D:-All the above
Correct Answer:- Option-C
Question29:-In hypothesis testing, a Type 1 error arises when
A:-Null hypothesis is rejected when it is true
B:-Null hypothesis is accepted when it is false
C:-Null hypothesis is accepted when it is true
D:-Null hypothesis is rejected when it is false
Correct Answer:- Option-A
Question30:-Which of the following is not a cross-cutting issue permeating through
the Biosafety protocol 2000?
A:-Environment
B:-Human Health
C:-Precaution
D:- Trade
Correct Answer:- Option-A
Question31:-Following is a list of some enzymes used in recombinant DNA
technology with their activity. Select the incorrect combination of enzyme and its
activity.
A:-T7 DNA polymerase : DNA polymerase and 3′ exonuclease activities
B:-Poly(A) polymerase : Adds AMP from ATP to the 3′ end of mRNA
C:-S1 nuclease : Degrades double-standard RNA
D:-Mung bean nuclease : Single-stranded DNA and RNA endonuclease
Correct Answer:- Option-C
Question32:-Few terms have been explained below. Select the correctly explained
ones.
(i) Multiple factor hypothesis explains variation in complex phenotypes such as
height, weight,
and disease susceptibility.
(ii) Broad-sense heritability is the proportion of the total phenotypic variance that is
due to
genetic factors.
(iii) Fitness is the number of offspring left by an individual, often compared with the
average of
the population.
(iv) QTL are associated with a particular phenotypic trait, which varies in degree
and which can
be attributed to polygenic effects.
A:-Only (i) and (iv) are correct
B:-Only (iii) and (iv) are correct
C:-Only (i) and (iii) are correct
D:-All are correct
Correct Answer:- Option-D
Question33:-Though fusion tags have been very helpful in the detection and
isolation of target recombinant proteins, they may interfere with the biological
function of the target protein eventually. Hence, they are generally removed by
cleaving a short linker amino acid sequence joining the fusion tag with the target
protein using appropriate protease enzymes. Which of the following is a commonly
used protease for performing the above cleavage?
A:-Trypsin
B:-Tobacco Etch Virus Protease
C:-Alpha peptidase
D:-None of the above
Correct Answer:- Option-B
Question34:-The ectopic expression of some transcription factors can increase the
efficiency of somatic embryogenesis (SE) induction and lead to the formation of
somatic embryos without adding hormones. Mutations in these genes have a
negative impact on the efficiency of SE induction. Which of the following is not such
a transcription factor?
A:-LEC
B:-BBM
C:-NOR
D:-AGL 15
Correct Answer:- Option-C
Question35:-When was the Protein Data Bank established and what was the
number of biological macromolecular structures held in the database at that time?
A:-1971 with 11 structures
B:-1991 with 11 structures
C:-1991 with 7 structures
D:-1971 with 7 structures
Correct Answer:- Option-D
Question36:-Osteogenesis imperfecta (OI) is a human bone disease. The majority of
people with this disease have a dominant mutation in one of the two genes that
produce type 1 collagen, COL1A1 or COL1A2. However, this disease doesn’t affect
everyone who has COLIA1 and COLIA2 mutations in the same way. In fact, some
people can carry the mutation but have no symptoms. Which of the following terms
explains the above phenomenon?
A:-Variable Expressivity
B:-Incomplete penetrance
C:-Codominance
D:-None of the above
Correct Answer:- Option-B
Question37:-Following are statements regarding bacteriophage lambda
(i) pR transcript encodes N, a transcriptional anti-terminator required for expression
of most
early lambda genes, and CIII, a positive regulator of lysogeny.
(ii) pL transcript encodes for Cro, CII, O, P, and Q
(iii) CII is the major lysogenic decision determinant, promoting the expression of CI
Which one of the options below represents the combination of all correct
stateemnts?
A:-Only(iii) is correct
B:-Only (ii) is correct
C:-Both (ii) and (iii) are correct
D:-Both (i) and (ii) are correct
Correct Answer:- Option-A
Question38:-Which of the following is an incorrect statement?
A:-H2AX is a variant of the histone protein H2 located throughout the
chromatin region
B:-Macro H2C is a variant of the histone protein H2 located in the inactive X
chromosome region
C:-H2Az is a variant of the histone protein H2 located in the euchromatin
region
D:-CENP-A is a variant of the histone protein H3 located in the centromere
region
Correct Answer:- Option-B
Question39:-Which of the following is an incorrect combination of a viral disease
and the Order of the causative virus?
(i) AIDS : Orterirales
(ii) Measles : Mononegativrales
(iii) SARS : Norzivirales
(iv) Rabies : Mononegavirales
A:-Both (i) and (ii)
B:-Both (ii) and (iv)
C:-Only (ii)
D:-Only (iii)
Correct Answer:- Option-D
Question40:-The mode of action of certain antibiotics is given below
(i) Ampicillin : Inhibition of cell wall synthesis by interference with peptidoglycan
cross-linking
(ii) Chloramphenicol : Inhibition of translation by blocking peptidyl transferase on
the 50S
ribosomal submit
Select the right option
A:-Both (i) and (ii) are correct
B:-Both (i) and (ii) are incorrect
C:-Only (i) is correct
D:-Only (ii) is correct
Correct Answer:- Option-A
Question41:-Which of the following media is selective and differential in its
function?
(i) Eosin methylene blue agar
(ii) MacConkey Agar
(iii) Mannitol Salt Agar
A:-Only (i) and (ii)
B:-Only (ii) and (iii)
C:-Only (iii)
D:-All of the above
Correct Answer:- Option-D
Question42:-Given below are hyperaccumulator plants with the elements that they
accumulate. Find out the correct combination.
(i) Nickel:Phyllanthus
(ii) Zinc : Arabidopsis
(iii) Arsenic : Pteris
(iv) Copper : Commelina
A:-Both (i) and (ii) are correct
B:-All are correct
C:-Both (iii) and (iv) are correct
D:-Only (iii) is correct
Correct Answer:- Option-B
Question43:-Which among the following does not belong to schedule I as per the
Wildlife Protection Act in India?
A:-Gangetic Dolphin
B:-Indian Porcupine
C:-Musk Deer
D:-Swamp Deer
Correct Answer:- Option-B
Question44:-Which of the following statements is correct about ice cores?
(i) The U.S. National Ice Core Laboratory, in Lakewood, Colorado, is the U.S. storage
facility,
which archives ice cores from all over the world
(ii) The ice cores contain annual layers that can be counted to known the age of the
ice, just
like rings inside a tree.
(iii) In India, ice core facility is available at Centre for Climate Research, IITM, Pune.
(iv) Ice cores tell about past climate, including the past atmospheric temperatures
and
greenhouse gases.
A:-All are correct
B:-Only (i) and (iv) are correct
C:-Only (i), (ii) and (iv) are correct
D:-Only (ii) and (iv) are correct
Correct Answer:- Option-C
Question45:-The natural products obtained from plants belong to different classes
and almost each one shows antiinfective properties. Among the various classes, the
ones with the lowest proportion of antiinfective metabolites are
A:-Sugars and Glycosylated compounds
B:-Phenolic compounds like xanthones and coumarins
C:-Peptides
D:-Anthracenes
Correct Answer:- Option-A
Question46:-What is preimplantation genetic testing?
A:-A technique used to determine the sex of the embryo before implantation
B:-A technique used to screen embryos for genetic disorders
C:-A technique used to select the most viable embryo for implantation
D:-A technique used to modify the genes of the embryo
Correct Answer:- Option-B
Question47:-Identify the incorrect statement.
(i) Density gradient centrifugation can be used to identify all repetitive DNA
sequences
(ii) The most highly repeated sequences in eukaryotic genomes do not encode
Proteins or
RNA
(iii) The most prevalent of the repeated DNA sequences are transposable genetic
elements, or
inactive sequences derived from transposable elements.
(iv) An abundance of dispersed repetitive DNA in the genome makes chromosomes
walking
easier.
A:-Only (i)
B:-Both (i) and (iv)
C:-Only (ii)
D:-Both (ii) and (iv)
Correct Answer:- Option-B
Question48:-Who among the following has received Nobel Prize for a direct
contribution to the field of Genetics?
(i) Har Gobind Khurana
(ii) Arthur Kornberg
(iii) Hamilton O Smith
(iv) Beadle and Tatum
A:-All of them
B:-Only (i) and (ii)
C:-Only (i), (ii) and (iv)
D:-Only (iii) and (iv)
Correct Answer:- Option-C
Question49:-Read the following statements in the context of epigenetics.
(i) When the DNA of a cell is replicated, histones associated with the DNA as part of
the
nucleosomes are distributed randomly to the daughter cells along with the DNA
molecules.
(ii) Histone code postulates that the state and activity of a particular region of
chromatin
depend on the specific modifications, or combinations of modifications, to the
histone tails
in that region.
(iii) The most notable histone modifications include acetylation, methylation and
phosphorylation.
(iv) Histone modifications alter the manner in which the histone tails of neighboring
nucleosomes interact with one another
Which among the above is a correct statement?
A:-Only (ii), (iii) and (iv)
B:-Only (i), (ii) and (iii)
C:-Only (iii) and (iv)
D:-All are correct
Correct Answer:- Option-D
Question50:-The major facilities supported by the Biotechnology Information
System Network (BTISnet) of the Department of Biotechnology, India include
A:-Indian Biological Data Centre (IBDC)
B:-Indo-Japan DAICENTER Programme
C:-MANAV : Human Atlas Initiative
D:-All of the above
Correct Answer:- Option-D