12870.The mechanism that causes a gene to move from one linkage group to another is called
crossing-over
inversion
duplication
translocation
Explanation:
Translocation is a chromosome abnormality caused by rearrangement of parts between nonhomologous chromosomes. Thus, it will involve a gene to move from one linkage group to another.
Inversion is a chromosome rearrangement in which a segment of chromosomes is rearranged end to end. It occurs in a reversal manner. Single chromosome undergoes breakage and rearrangment within itself.
Translocation is a chromosome abnormality caused by rearrangement of parts between nonhomologous chromosomes. Thus, it will involve a gene to move from one linkage group to another.
Inversion is a chromosome rearrangement in which a segment of chromosomes is rearranged end to end. It occurs in a reversal manner. Single chromosome undergoes breakage and rearrangment within itself.
12872.A true breeding plant is
Always homozygous recessive in its genetic constitution
One that is able to breed on its own
Produced due to cross pollination among unrelated plants
near homozygous and produces offspring of its kind
Explanation:
A true breeding plant is one that, when self-fertilized, only produces off spring with some trait. The organisms are genetically identical and have identical alleles for specified trait.
A true breeding plant is one that, when self-fertilized, only produces off spring with some trait. The organisms are genetically identical and have identical alleles for specified trait.
12873.Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria?
5·8 S rRNA
5 S rRNA
18 S rRNA
23 S rRNA
Explanation:
23 S rRNA from large subunit of ribosome acts as structural RNA as well as ribozyme.
23 S rRNA from large subunit of ribosome acts as structural RNA as well as ribozyme.
12874.Stirred-tank bioreactors have been designed for
ensuring anaerobic conditions in the culture vessel
purification of product
addition of preservatives to the product
availability of oxygen throughout the process
Explanation:
Stirred tank bioreactors are useful for aeration.
Stirred tank bioreactors are useful for aeration.
12875.A molecule that can act as a genetic material must fulfill the traits given, except
it should provide the scope for slow changes that are required for evolution
it should be able to express itself in the form of Mendelian characters
it should be able to generate its replica
it should be unstable structurally and chemically
Explanation:
Genetic material should be stable (chemically) otherwise its expression will change leading to loss in several metabolic functions or inconsistency in expression.
Genetic material should be stable (chemically) otherwise its expression will change leading to loss in several metabolic functions or inconsistency in expression.
12876.DNA-dependent RNA polymerase catalyzes transcription on one strand of the DNA which is called the
antistrand
template strand
coding strand
alpha strand
Explanation:
The strand of DNA on which RNA Polymerase binds to perform transcription is called template strand.
The strand of DNA on which RNA Polymerase binds to perform transcription is called template strand.
12877.Interspecific hybridization in the mating of
more closely related individuals within same breed for 4-6 generations
animals within same breed without having common ancestors
two different related species
superior males and females of different breeds
Explanation:
Interspecific hybridisation - In this method male and femal animals of two different species are mated. e.g. Mule.
Interspecific hybridisation - In this method male and femal animals of two different species are mated. e.g. Mule.
12878.Which of the following is correct regarding AIDS causative HIV?
HIV does not escape but attacks the acquired immune response.
HIV is enveloped virus containing one molecule of single-stranded RNA and one molecule of reverse transcriptase.
HIV is enveloped virus that contains two identical molecules of single-stranded RNA and two molecules of reverse transcriptase.
HIV is unenveloped retrovirus.
12879.Among the following edible fishes, which one is a marine fish having rich source of omega-3 fatty acids?
Mackerel
Mystus
Mangur
Mrigala
Explanation:
Rastrelliger (Mackerel) is a marine fish, Mystus, Magus and Mrigala are freshwater fishes.
Rastrelliger (Mackerel) is a marine fish, Mystus, Magus and Mrigala are freshwater fishes.
12880.Match Column-I with Column-II and select the correct option using the codes given below :
Codes:
a b c d
| Column-I | Column-II |
|---|---|
| a. Citric acid | (i)Trichoderma |
| b. Cyclosporin A | (ii) Clostridium |
| c. Statins | (iii) Aspergillus |
| d. Butyric acid | (iv) Monascus |
Codes:
a b c d
(iii) (iv) (i) (ii)
(iii) (i) (ii) (iv)
(iii) (i) (iv) (ii)
(i) (iv) (ii) (iii)
Explanation:
Citric acid - Aspergillus
Cyclosporin A - Trichoderma
Statins - Monascus
Butyric acid - Clostridium
Citric acid - Aspergillus
Cyclosporin A - Trichoderma
Statins - Monascus
Butyric acid - Clostridium
12881.Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from
sugar industry
domestic sewage
dairy industry
petroleum industry
Explanation:
Water bodies receiving effluents from petroleum industry do not have very high BOD.
Water bodies receiving effluents from petroleum industry do not have very high BOD.
12882.The principle of competitive exclusion was stated by
Verhulst and Pearl
C. Darwin
G. F. Gause
MacArthur
12883.Which of the following National Parks is home to the famous musk deer or hangul?
Dachigam National Park, Iammu & Kashmir
Keibul Lamjao National Park, Manipur
Bandhavgrah National Park, Madhya Pradesh
Eaglenest Wildlife Sanctuary, Arunachal Pradesh
12884.A lake which is rich in organic waste may result in
mortality of fish due to lack of oxygen
increased population of aquatic organisms due to minerals
drying of the lake due to algal bloom
increased population of fish due to lots of nutrients
Explanation:
Presence of large amount of organic waste (nutrient) in water causes algal bloom, which cause fish mortality.
Lake with large amount of organic waste will increase BOD of water since microbes will use more Dissolved Oxygen to degrade organic matter.
Presence of large amount of organic waste (nutrient) in water causes algal bloom, which cause fish mortality.
Lake with large amount of organic waste will increase BOD of water since microbes will use more Dissolved Oxygen to degrade organic matter.
12885.The highest DDT concentration in aquatic food chain shall occur in
eel
phytoplankton
seagull
crab
Explanation:
Bioamplification of nondegradable chemicals is seen as we move upwards in trophic level. It is always highest at last trophic level. In aquatic food chain, seagull is the topmost trophic level and thus in Sea gull (bird), level of DDT will be maximum.
Bioamplification of nondegradable chemicals is seen as we move upwards in trophic level. It is always highest at last trophic level. In aquatic food chain, seagull is the topmost trophic level and thus in Sea gull (bird), level of DDT will be maximum.
12886.Which of the following sets of diseases is caused by bacteria?
Herpes and influenza
Cholera and tetanus
Typhoid and smallpox
Tetanus and mumps
Explanation:
Cholera - Vibrio cholerae and Tetanus - Clostridium tetani.
Small pox - Variola Virus
Typhoid - Salmonella typhi
Mumps - Mumps virus
Herpes - Herpes Zooster Virus
Influenza - Haemophilus Influenza virus
Cholera - Vibrio cholerae and Tetanus - Clostridium tetani.
Small pox - Variola Virus
Typhoid - Salmonella typhi
Mumps - Mumps virus
Herpes - Herpes Zooster Virus
Influenza - Haemophilus Influenza virus
12887.Match Column-I with Column-II for housefly classification and select the correct option using the codes given below :
Codes :
a b c d
| Column-I | Column-II |
|---|---|
| a. Family | (i) Diptera |
| b. Order | (ii) Arthropoda |
| c. Class | (iii) Muscidae |
| d. Phylum | (iv) Insecta |
Codes :
a b c d
(iv) (ii) (i) (iii)
(iii) (i) (iv) (ii)
(iii) (ii) (iv) (i)
(iv) (iii) (ii) (i)
Explanation:
Housfly : -
Family - Muscidae
Order - Diptera
Class - Insecta
Phylum - Arthropoda
Housfly : -
Family - Muscidae
Order - Diptera
Class - Insecta
Phylum - Arthropoda
12888.Choose the correct statement.
All Pisces have gills covered by an operculum.
All mammals are viviparous.
All cyclostomes do not possess jaws and paired fins.
All reptiles have a three-chambered heart.
Explanation:
All mammals are viviparus except Ornithorhynchus / Duck billed platypus which is oviparous.
All reptiles have 3 chambered heart except crocodile.
All psices have gills covered by operculum except chondrichthyes.
All cyclostomata do not possess jaws and paired fins.
All mammals are viviparus except Ornithorhynchus / Duck billed platypus which is oviparous.
All reptiles have 3 chambered heart except crocodile.
All psices have gills covered by operculum except chondrichthyes.
All cyclostomata do not possess jaws and paired fins.
12889.Study the four statements (A - D) given below and select the two correct ones out of them :
A. Definition of biological species was given by Ernst Mayr.
B. Photoperiod does not affect reproduction in plants.
C. Binomial nomenclature system was given by R. H. Whittaker.
D. In unicellular organisms, reproduction is synonymous with growth.
The two correct statements are
A. Definition of biological species was given by Ernst Mayr.
B. Photoperiod does not affect reproduction in plants.
C. Binomial nomenclature system was given by R. H. Whittaker.
D. In unicellular organisms, reproduction is synonymous with growth.
The two correct statements are
A and B
B and C
C and D
A and D
Explanation:
Photoperiod affects flowering in plants.
Five kingdom system of classification was given by R.H Whittaker
Photoperiod affects flowering in plants.
Five kingdom system of classification was given by R.H Whittaker