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1 ï»¿DNA fingerprinting recognizes the differences in

A satellite DNA B bulk DNA C Â Repetitive DNA D Â both (a) and (c)

✅ Correct Answer: 4

2 This force can stabilize a DNA double-helixÂ

A Â Hydrophilic sugar-phosphate groups are found on the exterior of the helix where interaction with water occurs B Hydrophobic bases are present in the interior of the helix; each base-pair is stabilized by the same number of hydrogen bonds C covalent base stacking interactions may take place between neighbouring bases within the same strand in the helix D Â non-covalent N-glycosidic bonds may form between nitrogenous bases in opposite strands in the helix

✅ Correct Answer: 1

3 In this type of DNA replication; of the two newly formed molecules; one is purely a new one and the other is an old one

A Â dispersive B conservative C semiconservative D both (b) and (c)

✅ Correct Answer: 3

4 Â The process of DNA replication is affected by an enzyme known as

A Mutase B Ligase C Polymerase I D Ribonuclease

✅ Correct Answer: 3

5 Â A DNA molecule in which both strands have radioactive thymidine is permitted to replicate in an environment that contains non-radioactive thymidine. What is the right number of DNA molecules which possess some radioactive thymidine post three duplications?

A Â one such molecule B two such molecules C Â four such molecules D eight such molecules

✅ Correct Answer: 2

6 If the DNA strand has nitrogenous base sequence ATTGCC; the mRNA will have?

A Â ATTGCA B UGGACC C UAACGG D ATCGCC

✅ Correct Answer: 3

7 The type of coiling in DNA is

A Zig-zag B Â Left-handed C Â Opposite D Â Right-handed

✅ Correct Answer: 4

8 In DNA; the enzyme which breaks the H2Â bonds is

A Â Ligase B Â Helicase C Topoisomerase D Polymerase

✅ Correct Answer: 2

9 Â The total DNA comprises what amount of cytoplasmic DNA in cells?

A Â 95-99% B 65-75% C 45-50% D 1-5%

✅ Correct Answer: 4

10 The bases are held together in a DNA double helix by hydrogen bonds. These bonds are

A Ionic bonds B Â Covalent bonds C Non-covalent bonds D Â Van der Waals forces

✅ Correct Answer: 3

11 This factor contributes to the carbon cycle

A fossil fuel combustion B respiration C photosynthesis D all of these

✅ Correct Answer: 4

12 The source of carbon to plants in the carbon cycle is

A fossil fuels B Â carbonate rocks C atmospheric carbon dioxide D all of the above

✅ Correct Answer: 3

13 The role of bacteria in the carbon cycle is

A Breakdown of organic compounds B Chemosynthesis C Â Photosynthesis D Assimilation of nitrogen compounds

✅ Correct Answer: 1

14 In the carbon cycle; the human body returns carbon to the atmosphere through this way:

A formation of glucose B waste products C photosynthesis D cellular respiration

✅ Correct Answer: 4

15 Respiration and photosynthesis are central to this process

A Â nitrogen cycle B phosphorous cycle C Â carbon cycle D sulphur cycle

✅ Correct Answer: 3

16 The difference between the phosphorous cycle and carbon cycle lies in the fact that

A the phosphorous cycle does not include a gaseous phase but the carbon cycle does B phosphorous does not enter living entities but carbon enters C Â the phosphorous cycle includes a solid phase; the carbon cycle does not D primary reservoir of the phosphorous cycle is the atmosphere; but rocks are the primary reservoirs for carbon cycle

✅ Correct Answer: 1

17 Most of the global warming is due to the perturbation of which of these cycles?

A Global nitrogen cycle B Â Global carbon cycle C Global water cycle D All of these cycles equally contribute

✅ Correct Answer: 2

18 This carbon isotope is radioactive and very rare

A Carbon â€“ 11 B Carbon â€“ 12 C Carbon â€“ 13 D Carbon â€“ 14

✅ Correct Answer: 4

19 By this method; the majority of carbon moves from the lithosphere to the atmosphere

A Â erosion B Â deposition C weathering D fossil fuel burning

✅ Correct Answer: 4

20 These entities sequester most carbon from the atmosphere

A Plants B Â Archaea C Bacteria D Insects

✅ Correct Answer: 1

21 The stimulation of a muscle fibre by a motor neuron occurs at the

A myofibril B Â transverse tubules C neuromuscular junction D sarcoplasmic reticulum

✅ Correct Answer: 3

22 An injury sustained by the hypothalamus is most likely to interrupt

A Â coordination during locomotion B Â short term memory C regulation of body temperature D executive function like decision making

✅ Correct Answer: 3

23 In humans; the Alzheimer disease is linked with the deficiency of

A acetylcholine B dopamine C glutamic acid D Gamma Amino Butyric Acid (GABA)

✅ Correct Answer: 1

24 What is the person with these symptoms suffering from? Outbursts of emotions; unpredictable moods; quarrelsome behaviour; conflicts with others

A Mood disorders B Â Addictive diroders C Schizoprenia D Borderline personality disorder (BPD)

✅ Correct Answer: 4

25 Even after the brain of a frog has been crushed; it still responds to a pinch on the leg by drawing it away. This act is an example of

A Â Conditioned reflex B Simple reflex C Automated motor response D Neurotransmitter induced response

✅ Correct Answer: 2

26 Which of these functions will be affected if the medulla oblongata is damaged?

A Vision B Thermoregulation C Memory D Tactile sensation â€“ response when prickled with a needle

✅ Correct Answer: 4

27 This part of the human brain is also known as the emotional brain

A Epithalamus B Â Limbic system C Â Brocaâ€™s area D Corpus callosum

✅ Correct Answer: 2

28 Â This is the outermost cranial appendage

A Â Dura mater B Â Pia mater C Â Skull D Arachnoid

✅ Correct Answer: 1

29 This cranial meninges is in close proximity of the brain tissue

A Dura mater B Pia mater C Arachnoid D Skull tissue

✅ Correct Answer: 2

30 This statement is not associated with midbrain

A the ventral portion of the midbrain is composed of mainly four; round swellings known as corpora quadrigemina B Â located between thalamus of the forebrain and pons of the hindbrain C the canal called cerebral aqueduct passes through the midbrain D hindbrain and midbrain constitute the brain stem

✅ Correct Answer: 1

31 Â Entities exhibiting properties of both non-living and living are:

A Â diatoms B Â lichens C Â bacteria D viruses

✅ Correct Answer: 4

32 This has a smaller intestine

A Â carnivore B herbivore C Â both (a) and (b) D none of the above

✅ Correct Answer: 1

33 Â Which of these substances is transported by the blood plasma?

A Carbon dioxide B Nitrogenous waste C Food D All of the above

✅ Correct Answer: 4

34 Here; the maximum exchange of material between blood and surrounding cells takes place

A Veins B Heart C Â Capillaries D Arteries

✅ Correct Answer: 3

35 In photosynthesis; the chlorophyll is used for

A No function B reduction of carbon dioxide C breaking down the water molecule D absorbing light

✅ Correct Answer: 4

36 Â The enzymes found in intestinal juice finally convert

A fats into fatty acids and glycerol B proteins to amino acids C complex carbohydrates into glucose D all of these

✅ Correct Answer: 4

37 The respiratory pigment in human beings is

A Â insulin B enzymes C Â haemoglobin D none of these

✅ Correct Answer: 3

38 This structure guards the opening of the hepatopancreatic duct into the duodenum

A Pyloric sphincter B Sphincter of Oddi C Semilunar valve D Ileocaecal valve

✅ Correct Answer: 2

39 Pick the correct one

A Â Serum = Blood + Fibrinogen B Â Lymph = Plasma + RBC + WBC C Â Plasma = Blood â€“ Lymphocytes D Blood = Plasma + RBC + WBC

✅ Correct Answer: 4

40 Â Reduction of blood pH will

A reduces the rate of heartbeat B Â reduces the blood supply to the brain C releases bicarbonate ions by the liver D decrease the affinity of haemoglobin with oxygen

✅ Correct Answer: 4

41 In which of the following groups would you place a plant that produces spores; lacks seeds and has vascular tissue?

A Bryophyte B Â Algae C Â Pteridophyte D Gymnosperm

✅ Correct Answer: 3

42 In Pteridophytes; the dominant generation is

A Â gametophytic B haploid C diploid D triploid

✅ Correct Answer: 3

43 Â Reduction division in pteridophytes occurs in

A Prothallus is formed B Gametes are formed C spores are formed D sex organs are formed

✅ Correct Answer: 3

44 Prothallus represents

A sporophytic phase in a fern B gametophytic phase in a fern C sporophytic phase in a gymnosperm D gametophytic phase in a gymnosperm

✅ Correct Answer: 2

45 Â Pteridophytes and Bryophytes differ in having

A Spermatozoids B Archegonia C Separate gametophytes D conducting system

✅ Correct Answer: 4

46 Â Which of the following is deemed to be vital in the development of seed habit?

A Heterospory B Dependant sporophyte C Free-living gametophyte D Haplontic life cycle

✅ Correct Answer: 1

47 Â Sporophytic and gametophytic phases are independent in

A Bryophytes B Pteridophytes C Phaeophytes D Gymnosperms

✅ Correct Answer: 2

48 Â â€˜Club mossâ€™ belongs to

A Fungi B Algae C Bryophyta D Pteridophyta

✅ Correct Answer: 4

49 Phloem is without ___________ in pteridophytes

A Bast fibres B Companion cells C Phloem parenchyma D sieve cells

✅ Correct Answer: 2

50 This group does not have seeds but has vascular tissues and produces spores

A Â Pteridophyta B Bryophyta C Â Angiosperms D Â Gymnosperms

✅ Correct Answer: 1

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NEET Biology MCQS Mock Test Paper 17