👉 NEET Biology Examination
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Instruction
- Total 20 question
- Total Marks 80
- Each Question 4 marks
- Negative marking -1 for each wrong Question
NEET CONCEPT TEST -9 | BIOLOGY | STD 12 | MANISH MEVADA
1. 3 ' AAA TGC GCG ATA 5' is the sequence of nucleotides on a gene ; after transcription the mRNA formed against it and the sequence of bases in the corresponding binding anticodons will be
( a ) 5 UUU ACG CGC UAU 3 ' and ' AAA - UGC - GCG - AUA 5
( b ) 5UAU CGC GCA UUU 3 ' and 3'AUA - GCG - CGU - AAA 5
( c ) 5 UUU ACC TUG UAU 3 ' and 3 AAA - UGG - UAC - AUA 5
( d ) 5 UAU GUT CCA UUU 3 ' and ' AUA - CAU - GGU - AAA 5 ' .
2. Which one of the following statements about morula in humans is incorrect ?
( a ) 5 UUU ACG CGC UAU 3 ' and ' AAA - UGC - GCG - AUA 5
( b ) 5UAU CGC GCA UUU 3 ' and 3'AUA - GCG - CGU - AAA 5
( c ) 5 UUU ACC TUG UAU 3 ' and 3 AAA - UGG - UAC - AUA 5
( d ) 5 UAU GUT CCA UUU 3 ' and ' AUA - CAU - GGU - AAA 5 ' .
2. Which one of the following statements about morula in humans is incorrect ?
( a ) It is formed of similar cells .
( b ) It is a solid ball like structure which looks like a little mulberry .
( c ) It is 4 - celled stage .
( d ) Zona pellucida remains intact .
3. Albinism is known to be due to an autosomal recessive mutation . The first child of a couple with normal skin pigmentation was an albino . What is the probability that their second child will also be an albino ?
( a ) 50 % ( b ) 75 % ( c ) 100 % ( d ) 25 %
4. Fill in the blanks by choosing the correct option depicting A to D.
( b ) It is a solid ball like structure which looks like a little mulberry .
( c ) It is 4 - celled stage .
( d ) Zona pellucida remains intact .
3. Albinism is known to be due to an autosomal recessive mutation . The first child of a couple with normal skin pigmentation was an albino . What is the probability that their second child will also be an albino ?
( a ) 50 % ( b ) 75 % ( c ) 100 % ( d ) 25 %
4. Fill in the blanks by choosing the correct option depicting A to D.
( a ) A - Outbreeding Inbreeding , C - Outcrossing , D - Emasculation
( b ) A - Inbreeding , B - Outbreeding , C - Outcrossing , D - Inter specific hybridisation
( c ) A - Cross between animals of same breed , B - Cross between animals of different breeds , C - Emasculation , D - Outcrossing
( d ) A - Cross between animals of different breeds , B - Cross between animals of same breed , C - Outcrossing , D - Interspecific hybridisation
5. Localised inflammatory response at the site of infection producing redness , swelling , pain and heat is due to
( a ) histamine and serotonin ( b ) prostaglandins and cerumen
( c ) cerumen and prostaglandins ( d ) cerumen and mucus .
6. Select the correct statement regarding protein synthesis .
( a ) At the end of translation the release factor binds to the initiation codon .
( b ) Peptidase catalyzes the formation of peptide bond .
( C ) UTRs are present between the start codon and stop codon .
( d ) When the small subunit of the ribosome encounters an mRNA , the process of translation begins .
7. Which of the following statements about breeding is incorrect ?
( a ) By inbreeding purelines cannot be evolved .
( b ) Continued inbreeding , especially close inbreeding reduces fertility and productivity .
( c ) Cross - breeding allows desirable qualities of two different breeds to be combined .
( d ) Inbreeding exposes harmful recessive genes that are eliminated by selection .
8. The inner glandular layer of the uterus that undergoes cyclical changes during menstrual cycle is
( a ) myometrium ( b ) perimetrium ( c ) endometrium ( d ) infundibulum .
9. Greenhouse gases are
( a ) absorbers of long - wave heat radiations from earth
( b ) transparent to both solar radiations and long - wave radiations from earth ( c ) absorbers of solar radiations for warming the atmosphere of earth
( d ) transparent to escape of heat from the earth's surface to outer space .
10. A biologist studied the population of rats in a barn . He found that the average natality was 280 , average mortality 260 , immigration 20 and emigration 40. The net increase in population is
( a ) 5 ( b ) zero ( c ) 10 ( d ) 15 .
11. In a fertilised embryo sac , the haploid , diploid and triploid structures are respectively
( a ) synergid , zygote and primary endosperm nucleus
( b ) synergid , antipodal and polar nuclei
( c ) antipodal , synergid and primary endosperm nucleus
( d ) synergid , polar nuclei and zygote .
12. Which one of the following animals may occupy more than one trophic level in the same ecosystem at the same time ?
( a ) Sparrow ( b ) Hawk ( c ) Goat ( d ) None of these
13. Which of the following statements is incorrect ?
( a ) Eco Rl cuts the DNA between bases G and A.
( b ) Each Eco Rl restriction endonuclease recognises a specific palindromic nucleotide sequence in DNA .
( c ) When cut by same restriction enzyme , the resultant DNA fragments do not have the compatible kind of sticky ends .
( d ) Making multiple identical copies of any template DNA is called gene cloning .
14. Some crop varieties bred by hybridisation and selection , for disease resistance to fungi , bacteria and virus are shown in the table given below . Fill up the blanks , A to D.
( a ) A - Wheat , B - White rust , C - Pusa Komal , D - Chilli
( b ) A - Chilli , B - Black rust , C - Pusa Komal , D - Wheat
( c ) A - Rice , B - White rust , C - Pusa Karan , D - Wheat
( d ) A - Maize , B - Brown rust , C - Pusa Karan , D - Millet
15. Given : 1 = natural selection ; 2 = variations and their inheritance ; 3 = survival of the fittest ; 4 = struggle for existence . According to Darwinism , which of the following represents the correct sequence of events in the origin of new species ?
( a ) 3,4 , 1,2 ( b ) 2,3,1,4 ( c ) 1 , 2 , 3 , 4 ( d ) 4,2,1,3 36.
16. A human protein which is being obtained from transgenic animals and is used to treat emphysema is
( a ) alpha - lactalbumin ( b ) thyroxine ( c ) a - 1 - antitrypsin ( d ) insulin .
17. Study the given pedigree carefully and select the correct option regarding it . The given pedigree shows
16. A human protein which is being obtained from transgenic animals and is used to treat emphysema is
( a ) alpha - lactalbumin ( b ) thyroxine ( c ) a - 1 - antitrypsin ( d ) insulin .
17. Study the given pedigree carefully and select the correct option regarding it . The given pedigree shows
( a ) inheritance of sex linked inborn error of metabolism like phenylketonuria
( b ) criss - cross inheritance of sex - linked character like colourblindness
( c ) inheritance of a condition like Alzheimer's disease as an autosomal dominant genes
( d ) inheritance of autosomal recessive genetic disorder like Gaucher's disease .
18. Bacillus thuringiensis forms protein crystals which contain insectidical protein . This protein
( a ) binds with epithelial cells of midgut of the insect pest ultimately killing it
( b ) is activated by acidic pH of the gut of the insect pest
( c ) does not kill the carrier bacterium which is itself resistant to this toxin
( d ) all of these .
19. Which of the following ecosystems is most productive in terms of net primary production ?
( a ) Deserts ( b ) Tropical rainforests
( c ) Deep oceanic ecosystem ( d ) Estuaries
20. Which of the following is a post - fertilisation event in flower ?
( a ) Transfer of pollen grains ( b ) Formation of flower
( c ) Formation of pollen grains ( d ) Embryo development
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ANSWER KEY
1. ( a ) 2. ( c ) 3. ( d ) 4. ( b ) 5. ( a ) 6. ( d ) 7. ( a ) 8. ( c ) 9. ( a ) 10. ( b ) 11. ( a ) 12. ( a ) 13. ( c ) 14. ( a ) 15. ( d ) 16. ( c ) 17. ( b ) 18. ( a ) 19. ( b ) 20. ( d )
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