Biology Practice Test 4

Biology Practice Test 4 is designed to help students strengthen their understanding of key biological concepts, theories, and processes for competitive entry tests like MDCAT, NUMS, AKU, UET, ECAT, NTS, as well as FSC Board Exams. This test covers topics from human anatomy, physiology, microbiology, and ecology, helping students improve accuracy and retention.

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Biology Practice Test 4

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1 / 100

Category: Biology

Which component enters into mitochondria after glycolysis?

NUMS Mock 1
Biology
Bioenergetics

A) Pyruvate

B) Acetate

C) Oxaloacetate

D) Acetyl – CoA

2 / 100

Category: Biology Ch 11 Class 11

Which component enters into mitochondria after glycolysis?

NUMS 2015
Biology
Bioenergetics
Elimination Tool:

A) Pyruvate

B) Acetate

C) Oxaloacetate

D) Acetyl – CoA

3 / 100

Category: Biology Ch 4 Class 12

During birth, central nervous system of infants can be damaged by

PMC Sample 3
Biology
Reproduction
Elimination Tool:

A) syphilis

B) genital herpes

C) gonorrhoa

D) HPV

4 / 100

Category: Biology Ch 6 Class 12

What will be the approximate length of a DNA strand having 500 nucleotides?

NUMS 2015
Biology
Chromosomes and DNA
Elimination Tool:

HIDE ELIMINATED OPTIONS

A) 100 nm

B) 130 nm

C) 170 nm

D) 150 nm

5 / 100

Category: Biology Ch 8 Class 12

A trait whose alleles are present in both males and females but prominent more in one sex than other is a:

NUMS 2016
Biology
Variation and Genetics
Elimination Tool:

A) Sex-linked trait

B) Sex limited trait

C) Sex influenced trait

D) X-linked trait

6 / 100

Category: Biology Ch 3 Class 11

Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called

Cofactor

Coenzymes

Activator

Enzymes

7 / 100

Category: Biology Ch 3 Class 11

Inactive enzyme precursors such as pepsinogen for pepsin are called as:

PMC Practice 1
Biology
Enzymes
Elimination Tool:

A) Holoenzymes

B) Actinases

C) Zymogens

D) Mucopolysaccharides

8 / 100

Category: Biology Ch 9 Class 12

The cells are held together by a Ca-pectate layer are called as:

NUMS 2016
Biology
Biotechnology
Elimination Tool:

A) Primary cell wall

B) Secondary cell wall

C) Middle lamella

D) Tertiary cell wall

9 / 100

Category: Biology

Q.15 Genes that affect growth rate in humans influencing both weight and height are?

A. Codominant

B. Epistasis

C. Polygene

D. Pleiotrop

10 / 100

Category: Biology Ch 7 Class 12

During interphase of the cell cycle, which of the following stage is for duplication of DNA:

NUMS 2019 Reconduct
Biology
Cell Cycle
Elimination Tool:

A) G0 phase

B) G1 phase

D) S phase

C) G2phase

11 / 100

Category: Biology Ch 6 Class 11

The presence of peptidoglycan in gram-positive bacteria is:

PMC Practice 3
Biology
Kingdom Prokaryote
Elimination Tool:

A) 40% of dry weight

B) 50% of dry weight

D) 80% of dry weight

C) 10% of dry weight

12 / 100

Category: Biology Ch 3 Class 12

The prolactin hormone, responsible for the activation of mammary glands to start producing milk, is a hormone of the:

NTS 2010
Biology
Coordination and Control
Elimination Tool:

A) Pituitary gland

B) Pancreas

C) Thyroid gland

D) Thymus gland

13 / 100

Category: Biology Ch 1 Class 12

In plants which of the following is a waste product produced both during photosynthesis and respiration

CO2

H2O

Both A and B

14 / 100

Category: Biology Ch 5 Class 11

The name Bacteriophage was coined by:

Charles Chamberland

Ivanowski

Twort

D Herelle

15 / 100

Category: Biology

Q.1 At which times there is no net gaseous exchange between leaves and the atmosphere?

A. Day

B. Night

C. Dawn and Dusk

D. Midnight

16 / 100

Category: Biology

Q.64 All of the following are the attributes of evolution except:

A. O3 began to filter UV radiations

B. Some organisms began to utilized O2 in the start of evolution

C. Nutrient supply is abundant

D. The reducing atmosphere slowly become oxidizing atmosphere

17 / 100

Category: Biology Ch 6 Class 11

Which of the following bacteria are thick rigid and spiral?

Vibrio

Spirillum

Spirochete

Coccus

18 / 100

Category: Biology Ch 9 Class 12

DNA analysis is done to

Diagnose viral infections

Identify criminals

Determine evolution

All of these

19 / 100

Category: Biology Ch 9 Class 11

Protonema is

Thallus like

Algae like

Fungus like

Plant like

20 / 100

Category: Biology Ch 1 Class 12

Sphincter muscle in urinary system present near the junction of:

NUMS 2019 Reconduct
Biology
Homeostasis
Elimination Tool:

A) Pelvis and ureter

B) Ureter and urinary bladder

C) Urinary bladder and urethra

D) Urethra and bladder

21 / 100

Category: Biology Ch 1 Class 11

In animals coordination is achieved by means of

Respiratory system

Nervous system

Endocrine system

Both b and c

22 / 100

Category: Biology

Q.21 The spent energy in the form pf ADP is regeneratèd by mitochondria into which of the following forni?

A. AMP

B.ATP

C.ADP

D.All of these

23 / 100

Category: Biology Ch 13 Class 11

Chest cavity is bounded by ribs and muscles on the sides, while the floor of chest cavity is called:

NUMS 2019 Reconduct
Biology
Gaseous Exchange
Elimination Tool:

A) Pleura

B) Alveoli

C) Chest cage

D) Diaphragm

24 / 100

Category: Biology Ch 11 Class 11

During cellular respiration NADH2 produces:

NUMS 2014
Biology
Bioenergetics
Elimination Tool:

A) 2 ATP

B) 3 ATP

C) 4 ATP

D) 5 ATP

25 / 100

Category: Biology Ch 3 Class 11

The lock and key model of enzyme action was proposed by:

PMC Sample 3
Biology
Enzymes
Elimination Tool:

A) Louis Pasteur

B) Emil Fischer

C) Daniel Koshland

D) Urey Miller

26 / 100

Category: Biology Ch 10 Class 12

Which of the following is a vestigial organ?

PMC Sample 2
Biology
Evolution
Elimination Tool:

A) Teeth

B) Nails

C) Body hair

D) Ears

27 / 100

Category: Biology Ch 5 Class 12

Fetus is human embryo from the beginning of which of the following?

PMC Sample 2
Biology
Growth and Development
Elimination Tool:

A) 2nd month

B) 3rd month

D) 5th month

C) 4th month

28 / 100

Category: Biology Ch 4 Class 11

Cellulose is the major component of

Primary wall

Secondary wall

Middle lamella

all of the above

29 / 100

Category: Biology Ch 12 Class 11

Stunted growth of roots is due to the deficiency of _____ in plants

Potassium

Magnesium

Phosphorus

Iron

30 / 100

Category: Biology

Q.63 Which hormone is produced mainly by corpus luteum in she ovary following ovulation?

A. Progesterone

B. FSH

C.LH

D. Chorionic gonadotrophic hormone

31 / 100

Category: Biology Ch 2 Class 11

Reactions in which simple substances are combined to form complex substances are called:

Metabolic reactions

Catabolic reactions

Anabolic reactions

None of these

32 / 100

Category: Biology Ch 1 Class 12

Which excretory product in produced in plants during autotrophic mode of life?

CO2

H2O

Both A and B

33 / 100

Category: Biology Ch 1 Class 11

Group of living organisms of the same species living in the same place at the same time is called

Community

Ecosystem

Biome

34 / 100

Category: Biology Ch 5 Class 11

Solanum tuberosum is a scientific name of:

Onion

Amaltas

Potato

Tomato

35 / 100

Category: Biology Ch 3 Class 11

Which statement is incorrect about Lock and Key Model?

Specific enzyme can transform only a specific substrate

Active site of an enzyme is a non flexible structure.

Active site does not change before during or even after the reaction.

It explains the mechanism of every chemical reaction.

36 / 100

Category: Biology Ch 9 Class 12

The genetically engineered vaccine is available for which of the following hepatitis virus?

PMC Practice 5
Biology
Biotechnology
Elimination Tool:

A) HBV

B) HAV

C) HCV

D) Options A and B are correct

37 / 100

Category: Biology Ch 5 Class 11

Genetically modified plants contain:

PMC Sample 2
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) No gene

B) No gene in transposition

C) Widely used in gene transfer

D) All of these options are correct

38 / 100

Category: Biology Ch 5 Class 11

The social organization of howling monkeys was studied by:

NUMS 2014
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Allen

B) Thorpe

C) Schjeldeup ebbe

D) Carpenter

39 / 100

Category: Biology Ch 3 Class 11

When inhibitor binds to enzyme other than active site and alters its structure, then it is called:

NUMS 2020
Biology
Enzymes
Elimination Tool:

A) Competitive inhibitor

B) Non-competitive inhibitor

C) Reversible inhibitor

D) Irreversible inhibitor

40 / 100

Category: Biology Ch 12 Class 11

Certain types of whales are also ______ feeder.

Fluid

Macrophagous

Filter

None of these

41 / 100

Category: Biology Ch 3 Class 11

The cofactor usually acts as “bridge” between:

NUMS 2018
Biology
Enzymes
Elimination Tool:

A) Enzyme & substrate

B) Enzyme & product

C) Coenzyme & substrate

D) Activator & substrate

42 / 100

Category: Biology Ch 1 Class 11

Oxygen accounts for ____ % of totals human body mass:

65%

18%

10%

43 / 100

Category: Biology

In the human cell, ______ is responsible for producing hydrogen peroxide.

NUMS Mock 2
Biology
Cell Structure and Function

A) Lysosomes

B) Mitochondria

C) Peroxisomes

D) Glyoxysomes

44 / 100

Category: Biology Ch 10 Class 11

Archaeopteryx is a connecting link between:

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Amphibians and reptiles

B) Reptiles and birds

C) Birds and mammals

D) None of these

45 / 100

Category: Biology Ch 5 Class 11

The virus can only survive and reproduce inside a:

NTS 2019
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Animal Cell

B) Bacterial cell

C) Living cell

D) Non-living cell

46 / 100

Category: Biology Ch 13 Class 11

When abdomen expands, the number of spiracles open is

47 / 100

Category: Biology

Q.56 Which of the following movements are possible in pivot joint?

A. Flexion and extension

B. Adduction and abduction

C. Rotation

D. Extension flexion and rotation

48 / 100

Category: Biology Ch 6 Class 11

Bacteria having a tuft of flagella at one end are called:

NTS 2017
Biology
Kingdom Prokaryote
Elimination Tool:

A) Peritrichous

B) Monotrichous

C) Lophotrichous

D) Amphitrichous

49 / 100

Category: Biology Ch 5 Class 11

Where can viruses replicate?

PMC Sample 1
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Animals

B) Plants

C) Bacteria

D) All of these options are correct

50 / 100

Category: Biology Ch 7 Class 12

Diplotene is the sub-stage of:

NTS 2011
Biology
Cell Cycle
Elimination Tool:

A) Anaphase

B) Telephase I

C) Prophase I

D) Metaphase

51 / 100

Category: Biology Ch 5 Class 12

Plasticity of cell wall increases during

Cell maturation

Cell elongation

Cell differentiation

Cell division

52 / 100

Category: Biology Ch 10 Class 11

All of the following are mammals EXCEPT the:

NTS 2017
Biology
Kingdom Animalia
Elimination Tool:

A) Porpoise

B) Shark

C) Whale

D) Walrus

53 / 100

Category: Biology Ch 10 Class 11

Among invertebrates, which possesses the greatest power of regeneration?

NUMS 2015
Biology
Kingdom Animalia
Elimination Tool:

A) Sponges

B) Platyhelminthes

C) Annelids

D) Echinoderms

54 / 100

Category: Biology Ch 9 Class 12

A weed engineered to produce a biodegradable plastic in cell granules is

. Mouse-cat cress

Mouse weed

Mouse-eared cress

None of these

55 / 100

Category: Biology Ch 10 Class 11

Pseudo coelomate animals are:

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Coelenterates

B) Nematodes

C) Annelids

D) None of them

56 / 100

Category: Biology Ch 6 Class 11

Select a method which causes the oxidation of chemical constituent of a bacterial cell:

PMC 2020
Biology
Kingdom Prokaryote
Elimination Tool:

A) Steam

B) Dry heat

C) Filtration

D) Radiation

57 / 100

Category: Biology

Q.23 Reflex action is type of

A. Voluntary action

B. Involuntary action

C. Saltatory conduction

D. None of these

58 / 100

Category: Biology Ch 2 Class 11

Antibodies are

NUMS 2019 Cancelled
Biology
Biological Molecules
Elimination Tool:

A) Primary proteins

B) Secondary proteins

C) Tertiary proteins

D) Quaternary proteins

59 / 100

Category: Biology Ch 8 Class 11

All of the following are characteristics of kingdom fungi except:

NUMS 2017
Biology
Kingdom Fungi
Elimination Tool:

A) Heterotrophy

B) Sessil

C) Cell wall

D) None of the above

60 / 100

Category: Biology Ch 6 Class 12

Rate of DNA replication by DNA polymerase is

2000 nucleotides / sec

1000 nucleotides / sec

150 nucleotides / sec

1050 nucleotides / sec

61 / 100

Category: Biology Ch 4 Class 11

Resolution power of a compound microscope is

2.0 ?m

2-4 A

24 ?m

24 A

62 / 100

Category: Biology

Q.11 In cocci, three plane division result in formation of sarcine which is a

A. Cuba of 8 cocci

B. Square of 4 cocci

C. Irregular structure

D. Triangular 6 cocci

63 / 100

Category: Biology Ch 7 Class 12

Microtubule subunits (for spindle fibers) are synthesized in _______ phase.

UHS 2019
Biology
Cell Cycle
Elimination Tool:

A) G1

B) M

C) G2

D) S

64 / 100

Category: Biology Ch 8 Class 12

Read the passage below to answer the question:

Haemophilia is a disorder in which blood fails to clot. Saad, a male haemophiliac, marries Sara, a normal woman and together they have four children, two boys (Ahmed and Ali) and two girls (Alia and Ayesha). None of the children display the symptoms of Haemophilia.

Ahmed, Ali, Ayesha, and Ali all marry normal individuals and have children. None of Ahmed’s or Ali’s children, male or female, display symptoms of haemophilia, but the sons of Alia and Ayesha display symptoms of haemophilia while the daughters of Alia and Ayesha do not.

Which of the following best explains the reason that Ahmed, Ali, Ayesha and Alia do not display symptoms of haemophilia, even though their father, Saad, is a haemophiliac.

NTS 2010
Biology
Variation and Genetics
Elimination Tool:

A) Haemophilia is an X-linked disorder, and Saad can only pass on his Y chromosome

B) Haemophilia is an X-linked disorder, and even though Alia and Ayesha receive a hemophiliac X-chromosome from Saad, Sara gave them a normal X-chromosome.

C) Haemophilia is a Y -linked disorder, and therefore cannot be displayed in females

D) Haemophilia is a Y-linked disorder ,and Ahmed and Ali must have received an X Chromosome from Saad

65 / 100

Category: Biology Ch 13 Class 11

Which of the following is not an infection of the lungs/respiratory tract?

NUMS 2015
Biology
Gaseous Exchange
Elimination Tool:

A) Histoplasmosis

B) Tuberculosis

C) Cystic fibrosis

D) None of the given options

66 / 100

Category: Biology Ch 9 Class 12

The DNA that has been altered and which now contains length of nucleotides from two different organisms is called a:

PMC 2020
Biology
Biotechnology
Elimination Tool:

A) Plasmid

B) Combined DNA

C) Vector

D) Recombinant DNA

67 / 100

Category: Biology

Q.66 Which one of the following is a non-protein group covalently bonded to a few respiratory enzymes among others?

A. Nicotine adenine dinucleotide

B. Flavin adenine dinucleotide

C. Nicotinamide adenine dinucleotide phosphate

D. All of the above

68 / 100

Category: Biology

The inhibitor which closely resembles the substrate in its molecular structure and inhibits the enzyme activity by binding to the active site of the enzyme is called:

NUMS Mock 4
Biology
Enzymes

A) Feedback inhibitor

B) Non-competitive inhibitor

C) Allosteric modulator

D) Competitive inhibitor

69 / 100

Category: Biology Ch 2 Class 11

Among the most abundant biomolecules, _____ is the most abundant one on earth.

NUMS 2016
Chemistry
Biological Molecules
Elimination Tool:

A) Proteins

B) Carbohydrates

C) Lipids

D) Vitamins

70 / 100

Category: Biology Ch 5 Class 11

It is very stable and allows viruses to exist in water, air, and the ground.

PMC Sample 1
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Nucleoproteins

B) Nucleocapsid

C) Tail of virus

D) Capsid

71 / 100

Category: Biology Ch 9 Class 12

By PCR we mean:

UHS 2018
Biology
Biotechnology
Elimination Tool:

A) Polymerase chronic reaction

B) Polymerase chain reaction

C) Polymerase copy reaction

D) Polymerase cross reaction

72 / 100

Category: Biology

Q.59 The last common ancestor of humans is known to be which of the following?

A. Homo neanderthalensis

B. Lemuroidea

Dromaeosaunas

D. Pan troglodytes

73 / 100

Category: Biology Ch 2 Class 12

Which of the following bones are present in the palm of the hand:

NTS 2010
Biology
Support and Movement
Elimination Tool:

A) Carpals

B) Metacarpals

C) Phalanges

D) Tarsal

74 / 100

Category: Biology Ch 5 Class 11

A bacteriophage consists solely of:

NTS 2011
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) DNA and protein

B) RNA and protein

C) RNA only

D) Protein only

75 / 100

Category: Biology Ch 3 Class 12

Which of the following is used in brewing industry to promote malting:

Gibberellins

Cytokinins

Auxins

Abscisic Acid

76 / 100

Category: Biology Ch 2 Class 11

Which bond provides stability to complex carbohydrate molecules?

C-H

C-O

C-C

C-N

77 / 100

Category: Biology

Four events in the transmission of nerve impulses across synapses are:

I. depolarisation of the presynaptic membrane

II. propagation of postsynaptic action potential

III. reabsorption of the transmitter substance

IV. release of transmitter substance into the synaptic cleft

In which sequence do these events occur?

FIRST -> LAST

NUMS Mock 4
Biology
Coordination and Control
D) IV, III, I and II

A) I, III, II, and IV

B) I, IV, II and III

C) IV, I, III and II

D) IV, III, I and II

78 / 100

Category: Biology Ch 3 Class 11

An example of competitive inhibition of an enzyme is the inhibition of;

UHS 2019
Biology
Enzymes
Elimination Tool:

A) Succinic dehydrogenase by malonic acid

B) Cytochrome oxidase by cyanide

C) Hexokinase by glucose

D) Carbonic anhydrase by carbon dioxide

79 / 100

Category: Biology

The structure of an enzyme is altered by which of the following inhibitors?

NUMS Mock 3
Biology
Enzymes

A) Reversible inhibitor.

B) Competitive inhibitor.

C) Non-competitive inhibitor.

D) Irreversible inhibitor.

80 / 100

Category: Biology Ch 3 Class 11

If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation:

Saturation

Denaturation

Composition

Inhibition

81 / 100

Category: Biology Ch 7 Class 11

The disease caused by Protozoal infection is:

NTS 2018
Biology
Kingdom Protista
Elimination Tool:

A) Rickets

B) Goiter

C) Malaria

D) Beri-beri

82 / 100

Category: Biology Ch 11 Class 11

Quantitative study of energy relationships in biological systems obeys.

Bioenergetics

Laws of thermodynamics

Laws of thermo chemistry

Laws of chemical energeti

83 / 100

Category: Biology Ch 4 Class 12

In asexual reproduction offspring are produced by which of the following?

PMC Sample 2
Biology
Reproduction
Elimination Tool:

A) meiosis

B) mitosis

C) both a and b

D) none of these

84 / 100

Category: Biology Ch 1 Class 11

Which character differentiates living things from non-living organisms?

They live in the same ecosystem.

They are acted upon by the same environment

They are highly organized and complex made of one or more cells and contain genetic material

Both a and b

85 / 100

Category: Biology Ch 4 Class 12

Viviparous animals are those in which

. Internal fertilization with external development in eggs

Internal fertilization with internal development inside female body

Internal fertilization and internal development followed by hatching of egg

External fertilization with external development

86 / 100

Category: Biology Ch 10 Class 11

Select an anamniote from the following:

PMC 2020
Biology
Kingdom Animalia
Elimination Tool:

A) Snake

B) Parrot

C) Frog

D) Crocodile

87 / 100

Category: Biology Ch 3 Class 11

In 1959, Koshland proposed which of the following?

PMC Practice 1
Biology
Enzymes
Elimination Tool:

A) Unit membrane model

B) Fluid mosaic model

C) Reflective index model

D) Induced fit model

88 / 100

Category: Biology Ch 4 Class 11

60S and 40S subunit combine to form ______ particle

100 S

90 S

80 S

70 S

89 / 100

Category: Biology Ch 7 Class 12

Meiosis occurs at the time of

Gamete formation in animals

Spore formattion in plants

Growth in animals

Both a and b

90 / 100

Category: Biology Ch 2 Class 11

Lecithin is formed by combining phosphatidic acid with ______:

NUMS 2020
Biology
Biological Molecules
Elimination Tool:

A) Serine

B) Choline

C) Inositol

D) Ethanolamine

91 / 100

Category: Biology Ch 12 Class 11

Which of the following is not the type of cells of gastric gland?

NUMS 2019 Cancelled
Biology
Nutrition
Elimination Tool:

A) Zymogenic

C) Sinusoidal

B) Parietal

D) Mucous neck

92 / 100

Category: Biology Ch 4 Class 11

A group of cells performing same function are known as:

NUMS 2016
Biology
Cell Structure and Function
Elimination Tool:

A) Organelles

B) Tissues

C) A system

D) Both A and B

93 / 100

Category: Biology Ch 2 Class 11

Which one is an organic compound?

CO2

Water

Lipids

HCI

94 / 100

Category: Biology Ch 8 Class 12

To check the homozygosity or heterozygosity of apparently dominant trait, we do the test cross by crossing it with:

NUMS 2019 Cancelled
Biology
Variation and Genetics
Elimination Tool:

A) Any Dominant trait

B) Homozygous dominant trait

C) Homozygous Recessive trait

D) Heterozygous dominant trait

95 / 100

Category: Biology

The thickest chamber of the human heart is:

NUMS Mock 4
Biology
Transport

A) Left atrium

B) Right atrium

C) Right ventricle

D) Left ventricle

96 / 100

Category: Biology

Q.54 Structures that were once functional in the past but no longer serve a purpose due to evolutionary adaptations and physiological changes are referred to as?

A Vestigial
B. Analogous structures
C. Homologous structures
D. None of these

A Vestigial

B. Analogous structures

C. Homologous structures

D. None of these

97 / 100

Category: Biology Ch 3 Class 11

Which of the following factors affect enzyme activity?

NTS 2011
Biology
Enzymes
Elimination Tool:

A) Temperature

B) pH

C) Concentration of substrate

D) Radiation

E) All of these

98 / 100

Category: Biology Ch 4 Class 11

A group of ribosomes attached to mRNA is known as

Polymer

Polypeptide

Polysomes

Monomer

99 / 100

Category: Biology Ch 9 Class 11

Which of the following features differentiate angiosperms from gymnosperms?

UHS 2010
Biology
Kingdom Plantae
Elimination Tool:

A) Pollens disperse by air

B) Haploid microspores

C) Ovaries

D) Pollen tubes

100 / 100

Category: Biology

Q.46 Which part of the brain connects the cerebrum with the spinal cord?

A. Forebrain

B. Cerebrum

C. Cerebellum

D. Brainstem

Your score is

The average score is 61%

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