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1 ï»¿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 dispersive B conservative C Â semiconservative D both (b) and (c)

✅ Correct Answer: 3

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

A Mutase B Ligase C Â Polymerase I D Ribonuclease

✅ Correct Answer: 3

3 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 one such molecule B two such molecules C four such molecules D eight such molecules

✅ Correct Answer: 2

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

A ATTGCA B UGGACC C UAACGG D ATCGCC

✅ Correct Answer: 3

5 Â The type of coiling in DNA is

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

✅ Correct Answer: 4

6 Â In DNA; the enzyme which breaks the H2Â bonds is

A Ligase B Helicase C Â Topoisomerase D Polymerase

✅ Correct Answer: 2

7 The total DNA comprises what amount of cytoplasmic DNA in cells?

A 95-99% B 65-75% C 45-50% D 1-5%

✅ Correct Answer: 4

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

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

✅ Correct Answer: 3

9 This factor contributes to the carbon cycle

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

✅ Correct Answer: 4

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

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

✅ Correct Answer: 3

11 The role of bacteria in the carbon cycle is

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

✅ Correct Answer: 1

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

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

✅ Correct Answer: 4

13 Â Respiration and photosynthesis are central to this process

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

✅ Correct Answer: 3

14 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 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

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

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

✅ Correct Answer: 2

16 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

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

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

✅ Correct Answer: 4

18 These entities sequester most carbon from the atmosphere

A Plants B Archaea C Bacteria D Insects

✅ Correct Answer: 1

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

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

✅ Correct Answer: 3

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

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

✅ Correct Answer: 3

21 Â In humans; the Alzheimer disease is linked with the deficiency of

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

✅ Correct Answer: 1

22 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 Â Schizoprenia D Borderline personality disorder (BPD)

✅ Correct Answer: 4

23 Â 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

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

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

✅ Correct Answer: 4

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

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

✅ Correct Answer: 2

26 This is the outermost cranial appendage

A Dura mater B Â Pia mater C Skull D Arachnoid

✅ Correct Answer: 1

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

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

✅ Correct Answer: 2

28 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 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

29 Entities exhibiting properties of both non-living and living are:

A diatoms B lichens C bacteria D Â viruses

✅ Correct Answer: 4

30 This has a smaller intestine

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

✅ Correct Answer: 1

31 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

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

A Â Veins B Heart C Capillaries D Arteries

✅ Correct Answer: 3

33 In photosynthesis; the chlorophyll is used for

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

✅ Correct Answer: 4

34 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

35 The respiratory pigment in human beings is

A insulin B enzymes C haemoglobin D none of these

✅ Correct Answer: 3

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

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

✅ Correct Answer: 2

37 Â Pick the correct one

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

✅ Correct Answer: 4

38 Reduction of blood pH will

A reduces the rate of heartbeat B 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

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

A Â Bryophyte B Algae C Pteridophyte D Gymnosperm

✅ Correct Answer: 3

40 Â In Pteridophytes; the dominant generation is

A Â gametophytic B haploid C Â diploid D Â triploid

✅ Correct Answer: 3

41 Reduction division in pteridophytes occurs in

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

✅ Correct Answer: 3

42 Prothallus represents

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

✅ Correct Answer: 2

43 Pteridophytes and Bryophytes differ in having

A Spermatozoids B Archegonia C Â Separate gametophytes D conducting system

✅ Correct Answer: 4

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

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

✅ Correct Answer: 1

45 Sporophytic and gametophytic phases are independent in

A Bryophytes B Pteridophytes C Phaeophytes D Gymnosperms

✅ Correct Answer: 2

46 â€˜Club mossâ€™ belongs to

A Â Fungi B Â Algae C Bryophyta D Â Pteridophyta

✅ Correct Answer: 4

47 Phloem is without ___________ in pteridophytes

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

✅ Correct Answer: 2

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

A Pteridophyta B Bryophyta C Â Angiosperms D Gymnosperms

✅ Correct Answer: 1

49 Mostly; the flesh of fruit is made of

A Â Collenchyma B Parenchyma C Meristem D Schlerids

✅ Correct Answer: 2

50 Prosenchyma is a type of

A Â Chlorenchyma B Collenchyma C Sclerenchyma D Â Parenchyma

✅ Correct Answer: 4

51 The tissue where cells are thin-walled; living; isodiametric along with intercellular spaces is

A Arenchyma B Prosenchyma C Â Collenchyma D Parenchyma

✅ Correct Answer: 4

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NEET Biology MCQS Mock Test Paper 16