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18251.

Question : degeneration of DNA after heating can be studied by comparing:

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`A:T` RATIO
`G:C` ratio
`SUGAR: Phosphate` ratio
number of nucleotides

ANSWER :A
Discussion
18252.

Question : Degenerated corpus luteum is called _____.

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ANSWER :CORPUS ALBICANS
Discussion
18253.

Question : Degeneracy of genetic codes is due to

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FUNCTIONAL 61 codons and 20 AMINO ACIDS
functional 64 codons and 20 amino acids
functional 20 codons and 20 amino acids
functional 20 codons and 61 amino acids

Answer :A
Discussion
18254.

Question : Degeneracy of codon - comment.

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Solution :A degenerate code means that more than one triplet CODON could code for a SPECIFIC amino acid. For EXAMPLE, CODONS GUU, GUC, GUA and GUG code for valine.
Discussion
18255.

Question :Deforestation means.......

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a) GROWING plants and trees in an area where there is no FOREST
b) growing plants and trees in an area where the forest is removed
c) growing plants and trees in a pond
d) REMOVAL of plants and trees

Solution :removal of plants and trees
Discussion
18256.

Question : Deforestation is creating various adverse effect on environment. Enlist the consequences of deforestation.

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Solution : (a) Increased global WARMING. (b) Loss of LIVELIHOOD for FOREST DWELLERS. (C) Loss of bio-diversity (d) Decrease in soil fertility. (e) Decline in annual rainfall.
Discussion
18257.

Question : Deforestation is creating a lot of problems in the environments. List the consequences of deforestation

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Solution :• ENHANCED `CO_2` concentration in atmosphere
• Loss of biodiversity
• Soil erosion
• Desertification
• DISTURBED HYDROLOGICAL cycles.
• Reduce emission of AUTOMOBILE exhaust
• Growing more TREES.
Discussion
18258.

Question : Deforestation generally results in reduction of :

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DROUGHT
SOIL erosion
RAINFALL
GLOBAL warming

Answer :C
Discussion
18259.

Question : Deforestation activitiesand forestfires leadsto therise in global temperature ,it is due to

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increased In CO level
DECREASE InCO level
INCREASE In CO level
decreased In C_O_2 level

Answer :C
Discussion
18260.

Question : Deforestation does not lead to

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a) Quick NUTRIENT CYCLING
b) SOIL erosion
c) ALTERNATION of local weather conditions
d) Destruction of NATURAL habitat weatherconditions

Solution :Quick nutrient cycling
Discussion
18261.

Question : Definitions/Explanation VNTR :

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Solution :The human genome CONTAINS numerous short DNA sequences that are present as tandem repeats of VARIED lengths at several chromosomal locations. These variable NUMBER tandem repeats IVNTRsJare important components of DNA FINGERPRINTS.
Discussion
18262.

Question : Definitions/Explanation Xerophytes

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Solution :PLANTS growing in XERIC CONDITIONS or DRY conditions.
Discussion
18263.

Question : Definitions/Explanation Trophic level :

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SOLUTION :Based on the source of their NUTRITION or food organisms occupy a SPECIFIC place in the food chain that is KNOWN as their trophic LEVEL.
Discussion
18264.

Question : Definitions/Explanation Transgene :

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Solution :A gene that is taken from ONE organism and inserted into the germ line of ANOTHER organism so that it is replicated as part of the genome and present in all the RECIPIENTS cells. The resulting organism is DESCRIBED as transgenic.
Discussion
18265.

Question : Definitions/Explanation Transcription :

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SOLUTION :The process of copying GENETIC information from one STRAND of the DNA into RNA is termed a TRANSCRIPTION.
Discussion
18266.

Question : Definitions/Explanation The structural gene :

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Solution :The structural GENE in a TRANSCRIPTION UNIT is flanked by a PROMOTER and TERMINATOR.
Discussion
18267.

Question : Definitions/Explanation Tailing :

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SOLUTION :In TAILING, adenylate, RESIDUES (200 - 300) are added at 3.-end in a template INDEPENDENT MANNER.
Discussion
18268.

Question : Definitions/Explanation Sticky end :

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Solution :The single - STRANDED EXTENSION of a DNA fragment that has been cleaved at a specific sequence OFTEN by a restriction endonuclease in a staggered cut such that this single stranded extension is COMPLEMENTARY to those of similarly cleaved DNAs.
Discussion
18269.

Question : Definitions/Explanation Stenothermals

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SOLUTION :Animals which can tolerate only small RANGE of TEMPERATURE.
Discussion
18270.

Question : Definitions/Explanation Standing state :

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Solution :The amount of nutrients, such as carbon, NITROGEN, PHOSPHORUS, calcium ETC., present in the soil at any given time is referred to as the standing state.
Discussion
18271.

Question : Definitions/Explanation Splicing :

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Solution :The primary TRANSCRIPTS contain both the EXONS and INTRONS and are non-functional. Hence it is subjected to a process called SPLICING where introns are removed and exons are JOINED in a defined order.
Discussion
18272.

Question : Definitions/Explanation Split gene :

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SOLUTION :The GENE with both EXONS and introns is a characteristic of EUKARYOTIC DNA.
Discussion
18273.

Question : Definitions/Explanation Species diversity

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SOLUTION :The SPECIES diversity of any AREA is determined by various species which LIVE there.
Discussion
18274.

Question : Definitions/Explanation Soil erosion :

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Solution :The REMOVAL and TRANSPORTATION of top layer of soil from its original position to another PLACE with the help of certain agents such as strong winds and FAST running rains is called as soil erosion.
Discussion
18275.

Question : Definitions/Explanation Smog :

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Solution :Smog is a dark coloured fog and is formed of SMOKE, dust, WATER vapour GASES like `SO_(2), NO_(2), H_(2)S`.
Discussion
18276.

Question : Definitions/Explanation Sere :

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Solution :The ENTIRE sequence of communities that SUCCESSIVELY CHANGE in a GIVEN area are called SERE.
Discussion
18277.

Question : Definitions/Explanation Sequence Annotation :

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Solution :The sequencing the whole set of genome that contained all the CODING and non coding SEQUENCE and later ASSIGNING DIFFERENT regions in the sequence with functions a term referred to as sequence Annotation.
Discussion
18278.

Question : Definitions/Explanation Semiconservative DNA replication :

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Solution :The TWO of DNA STRANDS would separate and act as a template for the synthesis of new complementary strands. After the COMPLETION of replication, each DNA molecule would have ONE parental and one NEWLY synthesized strand. This scheme was termed as semiconservative DNA replication.
Discussion
18279.

Question : Definitions/Explanation Sanctuary

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SOLUTION :A sanctuary is an area which is reserved for the conservation of animals and only OPERATIONS such as, harvesting of timber, collection of minor forest PRODUCTS and private ownership rights are allowed with the CONDITION that they do not AFFECT the animal adversely.
Discussion
18280.

Question : Definitions/Explanation Sciophytes

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SOLUTION :PLANTS GROWING in lower light INTENSITIES. They are also called as shade plants.
Discussion
18281.

Question : Definitions/Explanation Saprotrophs :

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SOLUTION :The ORGANISMS which get NUTRITION by decomposition DEAD remains or dead organic MATTER.
Discussion
18282.

Question : Definitions/Explanation Replication fork :

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Solution :For long DNA MOLECULES, since the two strands of DNA cannot be separated in its entire LENGTH the REPLICATION occur within a small opening of the DNA helix referred to as replication fork.
Discussion
18283.

Question : Definitions/Explanation Regulatorgene :

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SOLUTION :It CONTROLS ACTIVITY of operator gene by producing REPRESSOR molecules.
Discussion
18284.

Question : Definitions/Explanation Productivity :

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Solution :The AMOUNT of biomass PRODUCTION is CALLED PRODUCTIVITY
Discussion
18285.

Question : Definitions/Explanation Promotergene :

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SOLUTION :It is an initiation point for transcription and the SITE for binding of RNA POLYMERASE.
Discussion
18286.

Question : Definitions/Explanation Pyrolysis :

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Solution :Pyrolysis is BURNING without oxygen.It consumes a LARGE amount of ENERGY. It is very costly MEANS of disposing of the wastes.
Discussion
18287.

Question : Definitions/Explanation Probe :

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Solution :A LABELLED SINGLE STRANDED DNA or RNA segment that can hybridize with a DNA or RNA of interest in a screening procedure.
Discussion
18288.

Question : Definitions/Explanation Point sources of water pollution :

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Solution :POINT sources of WATER pollution discharge their pollutant at a SPECIFIC site e.g domestic sewage and industrial effluents.
Discussion
18289.

Question : Definitions/Explanation Operator gene :

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SOLUTION :It GIVES PASSAGE to RNA polymerase moving from promotor to structural GENE i.e. it CONTROL activity of structural gene.
Discussion
18290.

Question : Definitions/Explanation Nucleosome :

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Solution :The negatively CHARGED DNA is wrapped around the positively charged histone octomer to FORM a structure called NUCLEOSOME.
Discussion
18291.

Question : Definitions/Explanation Non-point sources of pollution :

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Solution :Non-point sources of pollution discharge their EFFLUENTS over a LARGE area e.g CITY storm water flow, agriculture RUN off etc.
Discussion
18292.

Question : Definitions/Explanation Noise :

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Solution :An UNPLEASANT sound DETRIMENTAL to HUMAN HEALTH.
Discussion
18293.

Question : Definitions/Explanation National parks

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Solution :A national park is an area which is strictly reserved for the WELFARE of wild life and where ACTIVITIES such as FORESTRY, grazing or CULTIVATION are not allowed.
Discussion
18294.

Question : Definitions/Explanation Key stone species

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Solution :Few ANIMALS that produces LONG lasting CHANGES which ALTER or maintain their environment.
Discussion
18295.

Question : Definitions/Explanation Introns :

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Solution :INTERVENING sequences which do not appear in MATURE or processed RNA. They only internupt EXONS.
Discussion
18296.

Question : Definitions/Explanation Hotspot

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Solution :These are AREAS that are EXTREMELY rich in SPECIES DIVERSITY, have HIGH endemism and are under constant threat.
Discussion
18297.

Question : Definitions/Explanation Insertional Inactivation :

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Solution :In plasmid, various genes producing antibiotic are seen which ACT as a selectable marker when FOREIGN gene is CONNECTED with this part, gene producing antibiotic becomes inactive. It is called insertional INACTIVATION.
Discussion
18298.

Question : Definitions/Explanation In-situ conservation

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SOLUTION :The conservation of genetic resources in their NATURAL HABITAT is CALLED in-situ conservation.
Discussion
18299.

Question : Definitions/Explanation Histones :

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SOLUTION :There is a set of positively charged BASIC protein CALLED Histones. Histones are rich in the basic amino acids RESIDUES LYSINES and arginincs.
Discussion
18300.

Question : Definitions/Explanation Histone octomer :

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Solution :Histones are organised to form a UNIT of EIGHT molecules CALLED as HISTONE octomer.
Discussion