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23001.

Question : A segment of DNA has a total of 1500 nucleotides, out of which 280 are adenine containing nucleotides. With suitable reasons and step by step calculation, determine the number of pyrirnidines bases possessed by this segment of DNA.

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SOLUTION :Ratio of PURINES to pyrimidines is equal according to Chargaff RULE, number of adenine (A) will be equal to the number of thymine (T)/A=T=280, G + C = Total number of nucleotides - Nucleotides CONTAINING A and T nitrogenous bases = 1500 - 560 = 940, number of cytosine (C) will be equal to the number of guanine (G), G = C = 470, the number of pyrimidines that the segment possess is C + T = 280 + 470 = 750
23002.

Question : A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is:

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symbiosis
commensalism
amensalism
ectoparasitism

Answer :B
23003.

Question : A sedentary sca ancmone gets attached to the shell lining of hermit crab. The association is

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ECTOPARASITISM 
SYMBIOSIS 
COMMENSALISM 
amensalism

Answer :C
23004.

Question : A secretion that digests both carbohydrates and proteins is -

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ptyalin
pepsin
pancreatic juice
saliva

Answer :C
23005.

Question : A scruber in the exhaust of a chemical industrial plant removes:

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GASES like ozone and methane
Particulate matter of SIZE 2.5 micrometer or less
Gases like sulphur dioxide
Particulate matter of size 5 micrometer or above 

ANSWER :C
23006.

Question : A scrubber in the exhaust of a chemical industrial plant removes(A) Gases like sulphur dioxide(B) Particulate matter of the size 5 micrometer or above(C) Gases like ozone and methane(D) Particulate matter of the size 2.5 micrometer or less

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GASES like sulphur dioxide
Particulate matter of the SIZE 5 MICROMETER or above 
Gases like ozone and methane
Particulate matter of the size 2.5 micrometer or less

Answer :A
23007.

Question :A scrubber in the exhaust of a chemical industrial plant removes

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Particulate matter of the size 2.5 MICROMETER or less
GASES like sulphur DIOXIDE
Particulate matter of the size 5 micrometer or above
Gases like OZONE and methane

Solution :A SCRUBBER in the exhaust of a chemical industrial plant removes gases like sulphur dioxide.
23008.

Question : A scrubber in the exhaust of a chemical industrial plant removes :

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gases like SULPHUR dioxide
particulate MATTER of the size 5 MICROMETER or above
gases like OZONE and methane
particulate matter of the size 2.5 micrometer of less

Answer :A
23009.

Question : A scion is grafted to a stock . The quality of fruits produced will be determinel by the genotype of :

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STOCK
SCION
Both stock and scion
NEITHER stock or scion

Answer :B
23010.

Question : A scientistwas studying an in vitro euckaryotic transcription system, which producedboth capped and uncapped mRNAs.For an experiment, he incubated these mRNAs with mammalian cell nuclear extract and quantified the different products as shown . Whichof the following graphs represents the expected result correctly ?

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ANSWER :d
23011.

Question : A scientist performed studies on a couple of restriction enzymes of E.coli bacterium that produced DNA with sticky ends. This scientist was

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HERBERT Boyer
Stanley Cohen
Boyer and Cohen
Chain and Florey

Answer :A
23012.

Question : A scientist found that a particular gene was mutated but the polypeptide coded by this gee had not changed. The mutation probably involved, which of the following?

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DELETION of one nucleotide
Addition of a nucleotide
SUBSTITUTION of a nucleotide
Addition of three nucleotides, which form a CONDON

Answer :C
23013.

Question : A sceintist added a chemiacal (cyanide) to an animal cell to stop aerobic respiration.Which of the following is most likely to have been affected by this tratment?

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Active transport of substrances ACROSS the plasma membrane
Passive transport of substrances across the plasma mambrane
Diffusion of SUBSTANCES across the plasma membrane
The thickness of the plasma membrane

SOLUTION :NA
23014.

Question : A sacred plant is

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OCIMUM BASILICUM
FICUS bengalensis
Prosopis cineraria
Aloe vera.

Answer :C
23015.

Question : A : Root pressure is dynamic and is alwaysa positive hydrostatic pressure . R : It is universal phenomenon and develops under absorption lag.

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If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
If both Assertion & Reason are true but the reason is notthe correct explanation of the assertion, then mark (2)
Assertion is true statement but Reason is FALSE, then mark (3)
If both Assertion and Reason are false statements , then mark (4)

Answer :C
23016.

Question :A root hair cell under ordinary conditions have a water potential in the range of

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-1 to -4 ATM
) -1 to + 4 atm
1 to 2 atm
-1 to 2 atm.

Answer :A
23017.

Question : (A) : RNAi takes place in all eukaryotic organisms as a method of cellular defence. (R) : This method involves silencing of aspecific mRNA due to a complementary dsRNA molecule.

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If both (A) and (R) are TRUE and (R) is the correct explanation of (A).
If both (A) and (R) are true but (R) is not THECORRECT explanation of (A).
If (A) is true but (R) is false.
If both (A) and (R) are false.

Answer :B
23018.

Question : A river with an inflow of domestic sewage rich in organic waste may result in

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INCREASED POPULATION of aquatic food web organisms 
an increased production of fish due to BIODEGRADABLE nutrients 
death of fish due to lack of oxygen 
drying of the river very soon due to ALGAL bloom 

Solution :death of fish due to lack of oxygen
23019.

Question : A ring of three chromosomes and six bevalents are observed in pea plant. What type of cytological abnormality is present in this plant?

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TRIPLOID
PRIMARY trisomic
Secondary trisomic
Inversion HOMOZYGOTE

ANSWER :B
23020.

Question : A ring of htree chromosomes and six bivalents are oberved in pea plant ,what type of cytogical abnormalityis present in this plant ? It is :

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triploid
primary trisomic
secondary trisomic
inversion homozgote

Answer :B
23021.

Question : (a) Rhizocarpon (b) Lecariora (c) Parmelia (d) Sonneratia

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Solution :REASON: It is a MANGROVE plant but the OTHERS are examples of lichens,
23022.

Question : [A] : Retinene is a constituent of vitamin A (re- tinol). [R]: Vitamin A deficiency naturally causes de- ficiency of rhodopsin inducing night blind- ness (Nyctalopia).

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If both A and R are true and R is the CORRECT EXPLANATION of A
If both A and R are true but R is not the correct explanation of A
If A is true and R is FALSE
If both A and R are false

ANSWER :A
23023.

Question : A restriction enzyme digests DNA into fragments. Name the technique used to check the progression of this enzyme and to separate the DNA fragments.

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SOLUTION :GET ELECTROPHORESIS
23024.

Question : (A) : Restriction endonuclease are referred to as the immune system of prokaryotes. (R) : These enzymes protect the genetic material of bacteria from 'invasion' by foreign DNAs.

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If both (A) and (R) are TRUE and (R) is the CORRECT EXPLANATION of (A).
If both (A) and (R) are true but (R) is not THECORRECT explanation of (A).
If (A) is true but (R) is false.
If both (A) and (R) are false.

Answer :A
23025.

Question : A restriction enzyme called ECORI fromE. coli is expected to cleave DNA at the following sequence.

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AAGTTC
GAATTC
AAGCTT
GTATATC

Answer :B
23026.

Question : (a) Restriction endonuclease : fragmentation of DNA (b) DNA ligase : _____

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SOLUTION :JOINING of DNA FRAGMENTS.
23027.

Question : A: Restitutional nucleus can be observed in endothecium cells R: Endothecium cells are usually triploid

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if both ASSETION A REASON are ture and the reason is the correct explanation of the assertion then mark
if both assertion & reason are ture and the reason is not the correct explanation of the assertin then mark
if assertion is TRUE statement but reason is false then mark
if both assertion and reason are flase statements then mark

ANSWER :D
23028.

Question : A research student collected certain alga and foundthat its cells contained both chlorophyll-a,b,cand chlorophyll-das well as phycoerythrin. The alga belongs to

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Rhodophyceae
Bacillariophyceae
Chlorophyceae
Phaeophyceae

Solution :(a) Members of Rhodophyceae (red algae) contains chlorophyll-a,d,r-phycoerythrin, r-phycocyanin, `alpha` and `BETA`-carotene PIGMENTS.
Members of chlorophyceae (green algae) contain chloropyll-a,B, and `beta`-carotene, `alpha`-carotene pigments. Members of CYANOPHYCEAE (cyanobacteria blue-green algae) contain chlorophyll-a,c-phycocyanin, c-phycoerythrini and `beta`-carotene pigments.
23029.

Question : A resting axonal membrane is comparatively more permeable to....... and nealy impermeable to.

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`NA^(+)` IONS and `K^(+)` ions
`K^(+)` ions and `Na^(+)` ions
`CA^(+)` ions and `Na^(+)`ions
`K^(+)` ions and `Ca^(+)` ions

Answer :B
23030.

Question : A :Reproductive health is considered as a social goal. R :In reproductive health emotion, physical , behaviour related aspects are covered.

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A & R are correct , R is explanation of A
A & R are correct , R is not the explanation of A
A is correct, R is incorrect
A is incorrect , R is correct

ANSWER :A
23031.

Question : A regulatory body working for the release of transgenic crops is(A) ICWMI(B) IARI(C) IRRI(D) GEAC

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ICWMI
IARI
IRRI
GEAC

Solution :GEAC
23032.

Question : A relevant portion of beta-chain of haemoglobin of a normal human is given below:

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Solution : Due to mutationA , GAG mutates to GAA. Both GAG and GAA code for glutamic acid and hence there is no change in RBCs. WHEREAS GUG formed due to mutationBcodes for valine and so the RBCs become sickle-shaped.
23033.

Question : A renewable exhaustible natural resource is :

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Coal
Petroleum 
Minerals
Forest 

ANSWER :D
23034.

Question : A regularity gene produces some kind of protein through its m-RNA that controls the activity of the operator gene which signals the fomation of specific enzyme required for the metabolic breakdown of the food. How does that protein regulate the activity of the operator gene?

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The MUTATED repressor PROTEIN produces activates the OPERATOR gene
The catabolic ACTIVATOR protein (CAP) produces activates the operator gene
The repressor protein produced, after combining with an inducer LEADS to activation of the operator gene

Answer :D
23035.

Question : A reduction in the number of which formed element of blood can lead to clotting disorders

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`CA^(2+)`
VIT K
Platelets
haemophilia

Answer :C
23036.

Question : [A] : Reduced blood can carry more CO_2 than oxygenated blood. [R]: Blood containing more CO_2 will take up relatively less C_2

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If both A and R are TRUE and R is the CORRECT EXPLANATION of A
If both A and R are true but R is not the correct explanation of A
If A is true and R is false
If both A and R are false

Answer :A
23037.

Question : A reduction in the quantity of oxygen evolution during photosynthesis may be observed at

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Light having wavelength more than 680 nm
Light having wavelength less than 680 nm
Light having wavelength 560 nm
Light having wavelength less than 360 nm

Answer :A
23038.

Question : A red pigment leghaemoglobin in root nodules a legumes is helpful in nitrogen fixation by :

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PROVIDING oxygen
Helping all AEROBIC respiration
Removal of oxygen
None of the above

Answer :C
23039.

Question : A recombinant DNA molecule was created by ligating a gene to a plasmid vector. By mistake, an exonuclease was added to the tube containing the recombinant DNA. How does this affect the next step in the experiment, i.e., bacterial transformation?

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Solution :The experiment will not be affected because the DNA of RECOMBINANT plasmid is circular, Le., without FREE ends, and EXONUCLEASE removes NUCLEOTIDES from the free ends of DNA.
23040.

Question : [A]: Recombinant DNA contains DNA from two or more sources. [R]: Plasmids are small extra rings of DNA in bacteria that carry genes not present in the bacterial chromosome

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If both A and R are TRUE and R is the correct explanation of A
If both A and R are true but R is not the correct explanation of A
If A is true and R is FALSE
If both A and R are false

Answer :B
23041.

Question : A recombinant DNA molecule was created by ligating a gene to a plasmid vector. By mistake, an exonuclease was added to the tube containing the recombinant DNA. How does this affect the next step in the experiment, i.e. bacterial transformation ?

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Solution :The experiment will not likely to be AFFECTED as recombinant DNA molecule is CIRCULAR closed, with no free ends. Hence, it will not be a substrate for exonuclease enzyme which removes NUCLEOTIDES from the free ends of DNA.
23042.

Question : A recessive sex-linked trait in human will be expressed :

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Only in MALES
More OFTEN in males than in FEMALES
More often in females than in males
Equally in both males and females

Answer :B
23043.

Question : [A] : Receptors located in tendons, joints and skeletal muscle give information regarding theposition and movement of various parts of body. [R]: These are called Algest receptors.

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If both A and R are TRUE and R is the correct EXPLANATION of A
If both A and R are true but R is not the correct explanation of A
If A is true and R is FALSE
If both A and R are false

Answer :C
23044.

Question : A recently discovered ecosystem is :

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Crater
Tundra
Floating lceberg
Vent

Answer :A
23045.

Question : [A]: Raphanobrassica is an excellent ex- ample of allotertraploidy. [R]: It involves intergeneric cross between radish genus- Raphanus and cabbage ge- nus- Brassica, each of which has a diplid chromosome number of 18.

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If both A and R are TRUE and R is the correct explanation of A
If both A and R are true but R is not the correct explanation of A
If A is true and R is FALSE
If both A and R are false

ANSWER :A
23046.

Question : An F_2 genotypic ratio of 1:4:6:4:1 instead of 9:3:3:1indicates :

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Monogenic
Qualitative
Quantitative
Incomplete

Answer :C
23047.

Question : A range of loudness of sound of 70 -90 decibels is rated as:

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very LOUD
painful
quiet
uncomfortable

Answer :D
23048.

Question : [A]: Random mutations together with genetic drifts and selection pressure establish ge- netic difference and morphological and physiological variations in formerly identical populations.[R]: These differences generally accumulate and thus lead to the establishment of clines, geographical races and finally distinct sub- species.

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If both A and R are TRUE and R is the CORRECT explanation of A
If both A and R are true but R is not the correct explanation of A
If A is true and R is FALSE
If both A and R are false

ANSWER :A
23049.

Question : [A]: Radioactive carbon ^(14)Cmethod is quite accurate for relatively recent fossils, not older than 40,000 years.[R]: It was discovered by Libby.

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If both A and R are true and R is the correct explanation of A
If both A and R are true but R is not the correct explanation of A
If A is true and R is FALSE
If both A and R are false

ANSWER :B
23050.

Question : A pygostyle bone is the :-

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Part of pelvic girdle of Rabbit
Last few CAUDAL vertebrae in birds
Part of SKULL of Frog
Last caudal vertebrae of Frog

Answer :B