Biology Practice Test 1

Created by Ali Durrani

MDCAT Practice Tests

Biology Practice Test 1

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1 / 100

Category: Biology Ch 9 Class 12

The process of replacing or supplementing the defective allele with a functional, normal allele is known as ______.

NTS 2012
Biology
Biotechnology
Elimination Tool:

A) Allele transplant

B) Physiotherapy

C) Gene therapy

D) Mutation

2 / 100

Category: Biology

Q.39 The fertilization of ovum takes place at:

A. Distal part of the oviduct

B. Proximal part of the oviduct

C. Middle part of the oviduct

D. Anywhere in the oviduct

3 / 100

Category: Biology Ch 6 Class 11

Which of the following structure is not present in all the bacteria?

Cell membrane

Chromatin bodies

Ribosomes

Capsule

4 / 100

Category: Biology Ch 8 Class 12

A cross between F1 hybrids and either of parents is called:

NUMS 2014
Biology
Variation and Genetics
Elimination Tool:

A) Back cross

B) Test cross

C) Reverse cross

D) None of the above

5 / 100

Category: Biology Ch 2 Class 12

In presence of muscle contraction, ______ is brought closer, _____ shortens and ______ disappears.

NUMS 2019 Reconduct
Biology
Support and Movement
Elimination Tool:

A) Z – line, H – zone, I – band

B) I – band, Z – line, H – zone

C) Z – line, I – band, H – zone

D) H – zone, I – band, Z – line

6 / 100

Category: Biology Ch 11 Class 12

Sequence of changes in community and its non-living environment over a period of time is

Niche

Succession

Alterations

Neo-ecology

7 / 100

Category: Biology

Q.9 A surfactant is essential for:

A. Efficient gas exchange

B. Maintaining structural integrity of alveoli

C. Both A and B

D. None of these

8 / 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

9 / 100

Category: Biology Ch 11 Class 11

1 NADH in respiratory chain produces:

NUMS 2015
Biology
Bioenergetics
Elimination Tool:

A) 1 ATP

B) 2 ATP

C) 3 ATP

D) 4 ATP

10 / 100

Category: Biology Ch 9 Class 11

Leaves of ……….. are used to cure cough and cold in horses.

NUMS 2015
Biology
Kingdom Plantae
Elimination Tool:

A) Glycyrrhiza glabra

B) Cassia alata

C) Bamboo

D) Both bamboo and Glycyrrhiza glabra

11 / 100

Category: Biology

Which one of the following muscles are considered as “Voluntary muscles”?

NUMS Mock 1
Biology
Support and Movement

A) Smooth muscles

B) Cardiac muscles

C) Skeletal muscles

D) Glandular muscles

12 / 100

Category: Biology Ch 8 Class 12

The genes which do not follow law of independent assortment

Crossed genes

Linked genes

Recessive genes

Dominant genes

13 / 100

Category: Biology

Q.25 The substrate of the trypsin is:

A. Proteins

B. Dipeptides

C. Polypeptides

D. Amino acids

14 / 100

Category: Biology Ch 4 Class 12

In which organism males are haploid

Aphids

Honey bee

Mosquito

Butterfly

15 / 100

Category: Biology Ch 9 Class 12

Cystic fibrosis patients lack a gene that codes for a transmembrane carrier of:

NTS 2017
Biology
Biotechnology
Elimination Tool:

A) Na+ ions

B) K+ ions

C) CI- ions

D) Ca2+ ions

16 / 100

Category: Biology Ch 6 Class 12

Genetic information in the DNA is encoded as:

NTS 2018
Biology
Chromosomes and DNA
Elimination Tool:

A) Deoxyribose sugar

B) Ribose sugar

C) Phosphate group

D) Sequence of nitrogenous bases

17 / 100

Category: Biology Ch 12 Class 11

In planaria, numerous small branches which end blindly are called as

Digestive tract

Intestinal caeca

Hepatic caeca

Both B & C

18 / 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

19 / 100

Category: Biology

_________ hormone is released from the posterior lobe of the pituitary gland.

NUMS Mock 3
Biology
Coordination and Control

A) Adrenaline

B) Thyroid stimulating hormone

C) FSH

D) Antidiuretic hormone

20 / 100

Category: Biology Ch 2 Class 12

Roots of a plant show

Positive phototropism and negative geotropism.

Negative phototropism and positive geotropism.

Negative tactic movement and positive tropic movement.

Positive geotropism of stem and roots

21 / 100

Category: Biology Ch 4 Class 12

In humans, ovaries after birth contain:

NUMS 2018
Biology
Reproduction
Elimination Tool:

A) Oogonia

B) Primary oocyte

C) Secondary oocyte

D) Ova

22 / 100

Category: Biology Ch 2 Class 12

Pick the mismatched pair for birds:

NUMS 2015
Biology
Support and Movement
Elimination Tool:

A) Air spaces – lighter body

B) Pectoral muscles – strong pull of wings

C) Urinary bladder – producing semisolid urine

D) Keel – attachment of muscles

23 / 100

Category: Biology Ch 7 Class 12

Most critical phase of mitosis is

Prophase

Anaphase

Metaphase

Telophase

24 / 100

Category: Biology Ch 8 Class 12

Pick the correct option about Drosophila.

NUMS 2015
Biology
Variation and Genetics
Elimination Tool:

A) The Male is larger with a pointed abdomen

B) The female has sex combs on its front legs

C) It has a generation time of just eight weeks

D) Salivary gland cells have giant chromosomes in their nuclei

25 / 100

Category: Biology Ch 5 Class 12

Germ layers are formed in which stage of development?

NUMS 2020
Biology
Growth and Development
Elimination Tool:

A) Morulation

B) Blastulation

C) Gastrulation

D) Organogenesis

26 / 100

Category: Biology

Which one of the following is most likely to occur in a boy during puberty?

NUMS Mock 4
Biology
Reproduction

A) He produces eggs

B) His shoulders broaden

C) The colour of his eyes change

D) None of these options is correct

27 / 100

Category: Biology Ch 1 Class 11

It is possible to date the rocks by comparing the amount of specific radioactive isotopes they contain. Which of the statement is correct in this respect:

Older sediment layers have equal amount of these reaioactive isotopes as that of the young ones

Older sediment layers have less amount of these reaioactive isotopes as that of the young ones.

Older sediment layers have greater amount of these radioactive isotopes as that of the young ones.

Older sediment layers did not have these radioactive isotopes

28 / 100

Category: Biology

Q.51 The heavy and light chains of an antibody molecule is held together by:

A. H-bonds

B. Disulphide bridges

C. Ionic interactions

D. Hydrophobic interactions

29 / 100

Category: Biology Ch 11 Class 11

The inner membrane of mitochondrion has many infoldings into the inner chamber, these folding are called as:

NUMS 2019 Reconduct
Biology
Bioenergetics
Elimination Tool:

A) Cristae

B) Cisternae

C) Matrix

D) F1 particles

30 / 100

Category: Biology

Q.24 Pepsinogen is produce by:

A. Mucous cells

B. Zymogen cells

C. Parietal cells

D. None of these

31 / 100

Category: Biology Ch 4 Class 12

Example of ovoviviparous

Reptiles

Mammal s

Duckbill platypus

Frog

32 / 100

Category: Biology Ch 13 Class 11

Vocal cords are stretched across

Larynx

Pharynx

Golttis

None of these

33 / 100

Category: Biology Ch 10 Class 11

Opposable thumbs are characteristic features of

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Lagomorpha

B) Primates

C) Ederitate

D) None of these

34 / 100

Category: Biology Ch 5 Class 12

When a fetus is in the uterus, what carries oxygen away from the placenta?

NTS 2013
Biology
Growth and Development
Elimination Tool:

A) The amniotic fluid

B) The amniotic sac

C) The lining of the uterus

D) The umbilical cord

35 / 100

Category: Biology Ch 4 Class 12

The human cells affected in HIV are which of the following?

PMC Sample 1
Biology
Reproduction
Elimination Tool:

A) RBCs

B) WBCs

C) Platelets

D) stem cells

36 / 100

Category: Biology Ch 13 Class 12

In air nitrogen is

57%

20%

79%

30%

37 / 100

Category: Biology Ch 10 Class 12

This theory says that “mitochondria and chloroplasts are, in effect, ancient bacteria which now live inside the larger cells”:

PMC 2020
Biology
Evolution
Elimination Tool:

A) Darwin’s theory of evolution

B) Lamarckism

C) Neo – darwinism

D) Endosymbiont theory

38 / 100

Category: Biology Ch 9 Class 12

First restriction enzyme was isolated by

Kary Mullis B

Hamilton O. Smith

Maxam Gilbert

Hamilton John

39 / 100

Category: Biology Ch 3 Class 12

The _____ may be a cell, neuron ending or an organ that receives the stimulus.

NUMS 2019 Reconduct
Biology
Coordination and Control
Elimination Tool:

A) Effector

B) Receptor

C) Adopter

D) Stimuli

40 / 100

Category: Biology Ch 9 Class 11

Excess water in plants is forced out in the form of droplets through?

PMC 2021 Tested
Biology
Kingdom Plantae
Elimination Tool:

A) Lenticles

B) Stomata

C) Hydathodes

D) Cuticle

41 / 100

Category: Biology Ch 12 Class 11

Ileum is about ______ long:

NTS 2010
Biology
Nutrition
Elimination Tool:

A) 3.6 centimeters

B) 3.6 mllimeters

C) 3.6 inches

D) 3.6 meters

42 / 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

43 / 100

Category: Biology Ch 3 Class 12

Which one of the following is a neurotransmitter?

NUMS 2020
Biology
Coordination and Control
Elimination Tool:

A) Dopamine

B) Hydrochloric acid

C) Sodium ions

D) Calcium ions

44 / 100

Category: Biology Ch 4 Class 12

Menstrual cycle can be divided into:

NUMS 2015
Biology
Reproduction
Elimination Tool:

A) Single phase

B) Two phases

C) Three phases

D) Four phases

45 / 100

Category: Biology

Genetic information in the DNA is encoded as:

NUMS Mock 1
Biology
Chromosomes and DNA

A) Deoxyribose sugar

B) Ribose sugar

C) Phosphate group

D) Sequence of nitrogenous bases

46 / 100

Category: Biology Ch 1 Class 12

Malpighian tubules are involved in excretion in:

NTS 2011
Biology
Homeostasis
Elimination Tool:

A) Cockroach

B) Earthworm

C) Human

D) Planaria

47 / 100

Category: Biology Ch 6 Class 12

The total of all the alleles in a population is called a:

NUMS 2014
Biology
Chromosomes and DNA
Elimination Tool:

A) Genetic drift

B) Genotype

C) Gene pool

D) Gene mutation

48 / 100

Category: Biology Ch 9 Class 11

The release of droplets of water from hydathodes is called:

PMC 2021 Tested
Biology
Kingdom Plantae
Elimination Tool:

A) Respiration

B) Guttation

C) Vaporization

D) Transportation

49 / 100

Category: Biology Ch 13 Class 12

A lullaby is a song. No song is prose. Some proses are epics.

Conclusions:

I. Some proses are songs.

II. Some epics are lullabies.

III. Some songs are lullabies.

Which of the following is most appropriate in the above case?

a) Only II

b) Only III

c) I, II, and III are inappropriate

a

b

c

none

50 / 100

Category: Biology

Q.30 Arterial blood contains ___________of CO2/100 ml of blood:

54

50

64

60

51 / 100

Category: Biology Ch 9 Class 11

The space between the overtopped dichotomous branches was occupied by a sheet of which cells during evolution of megaphylls?

PMC Sample 2
Biology
Kingdom Plantae
Elimination Tool:

A) Sclerenchyma

B) Parenchyma

C) Collenchyma

D) Chlorenchyma

52 / 100

Category: Biology Ch 10 Class 11

Which of the following phyla of Kingdom Animalia do humans belong to?

NTS 2018
Biology
Kingdom Animalia
Elimination Tool:

A) Mollusca

B) Arthropoda

C) Echinodermata

D) Chordata

53 / 100

Category: Biology Ch 4 Class 11

70S sized ribosomes are found in the cytoplasm of:

PMC 2020
Biology
Cell Structure and Function
Elimination Tool:

A) Algae

B) Fungi

C) Protozoans

D) Bacteria

54 / 100

Category: Biology Ch 12 Class 11

Secretion of pancreatic juice is stimulated by:

NUMS 2019 Cancelled
Biology
Nutrition
Elimination Tool:

A) Secretin

B) Gastrin

C) Pepsinogen

D) Both secretin and gastrin

55 / 100

Category: Biology Ch 6 Class 12

Part of the amino acid sequences In normal and sickle cell hemoglobin are shown.

Normal haemoglobin

Thr – pro – glu – glu

Sickle cell haemoglobin

thr – pro – val – glu

mRNA codons for these amino acids are

Glutamine (glu) GAA GAG

Threonine (thr) ACU ACC

Proline (pro) CCU CCC

Valine (val) GUA GUG

Which transfer RNA molecule is Involved in the formation of this part of the sickle cell haemoglobin?

NTS 2016 DUHS & JSMU
Biology
Chromosomes and DNA
Elimination Tool:

A) GUG

B) CAU

C) UGC

D) GAG

56 / 100

Category: Biology

Q.52 A chromosome in which a centromere stays at one end is called?

A. Metacentric

Telocentric

C. Acrocentric

D. All of these

57 / 100

Category: Biology Ch 4 Class 12

Duration of menstrual cycle is how many days on average?

PMC Sample 1
Biology
Reproduction
Elimination Tool:

A) 25

B) 26

C) 27

D) 28

58 / 100

Category: Biology

During cell division, the spindle fibres get attached to condensing chromosome at a highly differentiated region. This region is called as:

NUMS Mock 1
Biology
Cell Cycle

A) Chromosome

B) Chromocentre

C) Centriole

D) Kinetochore

59 / 100

Category: Biology Ch 12 Class 12

In which zone plant community is most diverse

Limnetic zone

Littoral zon

Profundal zone

All of these

60 / 100

Category: Biology Ch 3 Class 11

Malonic acid is an example of:

Irreversible inhibitor

Reversible inhibitor

Competitive inhibitor

Non-competitive inhibitor

61 / 100

Category: Biology

The branch of science dealing with the fossil record is called:

NUMS Mock 2
Biology
Biology and its Major Fields of Specialization

A) Genetics

B) Taxonomy

C) Archeology

D) Palentology

62 / 100

Category: Biology

What part of the brain integrates sensory information such as pain and temperature?

NUMS Mock 2
Biology
Coordination and Control

A) Forebrain

B) Midbrain

C) Hindbrain

D) Spinal cord

63 / 100

Category: Biology Ch 7 Class 12

Which statement is incorrect?

In human, cell cycle is about 24 hrs

Mitosis takes 30 min

G2 5.5 hrs

Yeast cell only 90 min

64 / 100

Category: Biology Ch 7 Class 11

Golden algae are also known as

Chrysophyta

Phaeophyta

Pyrrophyta

Rhodophyta

65 / 100

Category: Biology

The region of the chromosome or, more specifically, the length of the DNA molecule, which has a particular function is called _______.

NUMS Mock 2
Biology
Chromosomes and DNA

A) Kinetochore

B) Locus

C) Allele

D) Gene

66 / 100

Category: Biology Ch 13 Class 11

Lungs are spongy due to the presence of million of

Air sacs

Alveoli

Bronchioles

Parabronchi

67 / 100

Category: Biology Ch 4 Class 11

Magnifying power of electron microscope as compared to eye is

500 X

250000X

500000X

250X

68 / 100

Category: Biology Ch 6 Class 11

When was the bacteriophage phenomena rediscovered by D’Herelle?

PMC Practice 4
Biology
Kingdom Prokaryote
Elimination Tool:

B) 1917

A) 1918

C) 1920

D) 1990

69 / 100

Category: Biology Ch 8 Class 11

Coenocytic hyphae are also known as

Septate

. Perforated hyphae

Aseptate

Uninucleate hyphae

70 / 100

Category: Biology

Now-a-days every newborn gets regular shots of vaccine for polio. It contains _________ for polio to make a child immune against this disease.

NUMS Mock 4
Biology
Bio-diversity | Variety of Life

A) Antibiotics

B) Antibodies

C) Antigens

D) Antisera

71 / 100

Category: Biology

Q.21 All of the following are true for platyhelminthes except:

A. Flatworms

B. Triploblastic

C. Coelomates

D. Bilateral symmetry

72 / 100

Category: Biology Ch 9 Class 12

Which one has antibiotic resistance gene for tetracycline and ampicillin?

pSC 101

pBR 322

pCR 322

None of these

73 / 100

Category: Biology Ch 7 Class 12

In meiosis II, ______ differentiate into sperms.

NUMS 2019 Reconduct
Biology
Cell Cycle
Elimination Tool:

A) Spermatocytes

B) Spermatids

C) Sertoli cells

D) Polar bodies

74 / 100

Category: Biology Ch 8 Class 11

Mycorrhizae are found in about ______ vascular plants

90%

95%

98%

96%

75 / 100

Category: Biology Ch 3 Class 12

The _____ is the main nutritional part and it’s concerned with the biosynthesis of materials necessary for neurons.

NUMS 2019 Reconduct
Biology
Coordination and Control
Elimination Tool:

A) Nerves

B) Axon

C) Soma

D) Dendrites

76 / 100

Category: Biology Ch 3 Class 12

The region where the impulse moves from one neuron to another is called ______.

NTS 2012
Biology
Coordination and Control
Elimination Tool:

A) Axon

B) Dendrites

C) Synapse

D) Thalamus

77 / 100

Category: Biology

Which of the following compounds possesses a single covalent bond between carbon and hydrogen?

NUMS Mock 4
Chemistry
Hydrocarbons

A) CH4

B) C2H2

C) C2H4

D) All of the above

78 / 100

Category: Biology Ch 13 Class 11

The most important cause of many of the respiratory disorders is:

NUMS 2019 Cancelled
Biology
Gaseous Exchange
Elimination Tool:

A) Bacterial infection

B) Pollution

C) Smoking

D) Drinking

79 / 100

Category: Biology

The passageways of the respiratory system have mucous secreting cells called:

NUMS Mock 3
Biology
Gaseous Exchange

A) Tracheal cells

B) Goblet cells

C) Surfactant cells

D) Pleural cells

80 / 100

Category: Biology Ch 12 Class 12

Productivity of an ecosystem is indicated by

Number of plants in that ecosystem

The density of that ecosystem

Consumption of carbon dioxide and evolve of oxygen

Both a and b

81 / 100

Category: Biology Ch 4 Class 12

Follicle – stimulating hormone, which is produced by the pituitary gland, stimulates the ovaries to produce:

NUMS 2019 Cancelled
Biology
Reproduction
Elimination Tool:

A) Estrogen

B) Estrogen and progesterone

C) Progesterone

D) Oxytocin

82 / 100

Category: Biology Ch 10 Class 12

Which of the following scientists contributed a lot to “modern synthetic theory of organic evolution:

NUMS 2014
Biology
Evolution
Elimination Tool:

A) Theodosius Dobzhansky 1937

B) Fischer 1958

C) Wright 1968

D) All of above

83 / 100

Category: Biology Ch 13 Class 12

Wild life refers to

All plants of the world

All non cultivated plant

Non domesticated animals

Both b and c

84 / 100

Category: Biology

Q.3 Which statement about cell membrane is incorrect?

A. Proteins are embedded in lipid bilayer

B. Cholesterol molecules are present in hydrophobic core

C. Central core is hydrophobic

D. Carbohydrates are present on both inner and outer face of the membrane

85 / 100

Category: Biology Ch 1 Class 12

Purine and pyrimidine catabolism results in production of

Creatinine

Trimethyamine oxide

Xanthine

None of these

86 / 100

Category: Biology Ch 9 Class 11

In plants chlorosis is caused by the deficiency of:

PMC Sample 3
Biology
Kingdom Plantae
Elimination Tool:

A) chlorophyll

B) magnesium

C) nitrogen

D) all of above

87 / 100

Category: Biology Ch 7 Class 11

Which type of chlorophyll is found in all types of algae?

NUMS 2015
Biology
Kingdom Protista
Elimination Tool:

A) Chlorophyll a

B) Chlorophyll b

C) Chlorophyll c

D) Chlorophyll d

88 / 100

Category: Biology

Q.32 In the ascent of sap, water moves up in:

A. Xylem

B. Cambium

C. Phloem

D. Endodermis

89 / 100

Category: Biology

Q.66 Which of the following provides the strong evidence in support of evolution:

A. Fossil record

B. Comparative embryology

C. Comparative anatomy

D. Molecular biology

90 / 100

Category: Biology

Q.34 If the non-protien part is loosely attached to the protein part in the enzyme, it is known as

A. coenzyme

B. prosthetic group

C. cofactor

D. apoenzyme

91 / 100

Category: Biology Ch 6 Class 11

Which of the following bacteria do not have flagella commonly?

Cocci

Bacilli

Streptobacilli

Vibrio

92 / 100

Category: Biology Ch 14 Class 11

Autoimmune diseases act as the principle of:

PMC 2020
Biology
Transport
Elimination Tool:

A) Self against antigens

C) Self against self

B) Antigen against self

D) Antigen self destroyed

93 / 100

Category: Biology Ch 13 Class 12

Conversion of ammonium into nitrates is:

UHS 2018
Biology
Man and His Environment
Elimination Tool:

A) Nitrification

B) Nitrogen Fixation

C) Ammonification

D) Denitrification

94 / 100

Category: Biology Ch 6 Class 12

Which of the following enzymes is used to join DNA fragments?

NTS 2016 DUHS & JSMU
Biology
Chromosomes and DNA
Elimination Tool:

A) DNA polymerase

B) Ligase

C) Primase

D) Endonuclease

95 / 100

Category: Biology

Q.40 Which of the following is true of both bacterial conjugation and meiosis?

A. Both processes produce four haploid cells

B. Both processes are a form of asexual reproduction

C. Both processes involve genetic recombination

D. None of these

96 / 100

Category: Biology

Why do some vegetables lose water when salt is applied to them?

NUMS Mock 3
Biology
Transport

A) Due to the less negative water potential of the external environment than the cell.

B) Due to the more negative water potential of the external environment that the cell

C) . Due to the less positive water potential of the external environment than the cell

D) Due to more positive water potential of the external environment than the cell

97 / 100

Category: Biology Ch 4 Class 12

Colour of corpus luteum is:

NUMS 2018
Biology
Reproduction
Elimination Tool:

A) Red

B) Yellow

C) Grey

D) Black

98 / 100

Category: Biology Ch 10 Class 11

Coelom is lined by

Parietal mesoderm

Visceral mesoderm

Mesoderm

Both A & B

99 / 100

Category: Biology

Q.35 Ribose is a monosaccharide constituent of man

A. Enzymes

B. Coenzymes

C. Vitamin

D. Antibiotics

100 / 100

Category: Biology Ch 1 Class 11

The branch of biology which deals with the study of social behavior and communal life of human beings living in any environment is called :

Environmental biology

Human biology

Both b and c

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