Biology Practice Test 1

Created by Ali Durrani

MDCAT Practice Tests

Biology Practice Test 1

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1 / 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

2 / 100

Category: Biology Ch 1 Class 12

Deamination in the liver initially produces:

NTS 2010
Biology
Homeostasis
Elimination Tool:

A) Ammonia

B) Arginine

C) Ornithine

D) Urea

3 / 100

Category: Biology Ch 3 Class 12

Direction of reflex action is from:

NUMS 2019 Reconduct
Biology
Coordination and Control
Elimination Tool:

A) Receptor to sensory neuron to motor neuron and then through associative neurons to effect.

B) Receptor to sensory neuron to associative neuron and then through motor neurons to effector.

C) Effector to sensory neuron to associative neuron and then through motor neurons to Receptor.

D) Effector to sensory neuron to motor neuron and then through associative neurons to Receptor.

4 / 100

Category: Biology Ch 12 Class 11

Percentage of magnesium by mass in a human being is:

NUMS 2015
Biology
Nutrition
Elimination Tool:

A) 0.005%

B) 0.25%

C) 0.15%

D) 0.35%

5 / 100

Category: Biology Ch 12 Class 11

Which of the following nutrients is incorrectly paired with its function in a plant?

NTS 2016 SMBBMC
Biology
Nutrition
Elimination Tool:

A) Potassium – Formation of cell wall.

B) Magnesium – Constituent of chlorophyll.

C) Nitrogen – Constituent of protein.

D) Phosphorus – Component of nucleic acid.

6 / 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

7 / 100

Category: Biology Ch 3 Class 12

Chemically auxins are

Indole propionic acid.

Indole carboxylic acid.

Indole acetaldehyde

Indole acetic acid

8 / 100

Category: Biology

Q.7 A neuron located in the cential hervous system that projects its axon outside the CNS is called:

A. Motor nerve

B. Sensory nerve

C. Both A and B

D. Mixed nerve

9 / 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

10 / 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

11 / 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

12 / 100

Category: Biology Ch 13 Class 11

Carbon dioxide is carried in the blood, mainly as:

NUMS 2015
Biology
Gaseous Exchange
Elimination Tool:

A) Sodium bicarbonate

B) Potassium bicarbonate

C) Carbamino-haemoglobin

D) Dissolved gas in plasma

13 / 100

Category: Biology Ch 1 Class 12

Which of the following fishes excrete large volume of diluted urine?

Bony Marine fishes

Fresh water fishes

Both depending upon the surrounding water

None of these

14 / 100

Category: Biology Ch 9 Class 12

Tobacco plants, resistant to a nematode, have been developed by the introduction of DNA that produces (in the host cells):

PMC Practice 11
Biology
Biotechnology
Elimination Tool:

A) Both sense and antisense RNA

B) A particular hormone

C) An antifeedant

D) A toxic protein

15 / 100

Category: Biology Ch 9 Class 12

Lambda phage is

Virus

Bacterium

Plasmid

Host cell

16 / 100

Category: Biology

Q.27 In the process of esterification OH is derived from?

A. Ether

B. Alcohol

C. Water

D. Both A and B

17 / 100

Category: Biology

When the concentration of the external medium is equal to the concentration of the internal medium of a cell, the situation is called:

NUMS Mock 1
Biology
Biological Molecules

A) Hypertonic

B) Hypotonic

C) Isotonic

D) Heterotonic

18 / 100

Category: Biology Ch 1 Class 12

The place of attachment of leaf with the shoot is called:

Pith

Pit

Pulvinus

Ecdysone

19 / 100

Category: Biology Ch 10 Class 11

Coelom is lined by

Parietal mesoderm

Visceral mesoderm

Mesoderm

Both A & B

20 / 100

Category: Biology Ch 4 Class 11

Detoxification of drugs is the function of _____ in a cell.

NUMS 2016
Biology
Cell Structure and Function
Elimination Tool:

A) R.E.R

B) S.E.R

C) Liver cells

D) Lysosome

21 / 100

Category: Biology Ch 9 Class 11

Antherozoids the male gamete in bryophytes are attracted towards Archegonium i.e. female sex organ by

Phototactic phenomenon

Chemotactic phenomenon

. Geotropic phenomenon

Chemotropic movement

22 / 100

Category: Biology Ch 5 Class 12

Growth of multicellular plants occur in

Two phases

Three phases

Five phase

Four phases

23 / 100

Category: Biology Ch 3 Class 11

Cyanide for enzymes act as:

NUMS 2018
Biology
Enzymes
Elimination Tool:

A) Substrate

C) Cofactor

B) Prosthetic group

D) Inhibitor

24 / 100

Category: Biology Ch 3 Class 11

What is not true about the induced fit model:

NUMS 2018
Biology
Enzymes
Elimination Tool:

B

A) Explains mechanism of enzyme action

B) Enzyme is specific in nature

C) Enzyme is a flexible structure

D) Enzyme doesn’t show change during reaction

25 / 100

Category: Biology Ch 9 Class 11

The gametophyte of Ulva is:

NUMS 2014
Biology
Kingdom Plantae
Elimination Tool:

A) Haploid

B) Diploid

C) Triploid

D) Polyploidy

26 / 100

Category: Biology Ch 11 Class 11

Estimating relative CO2consumption or O2release during photosynthesis at different wavelengths of light, is termed as:

NUMS 2015
Biology
Bioenergetics
Elimination Tool:

A) Action spectrum

B) Absorption spectrum

C) Dark reaction

D) Light reaction

27 / 100

Category: Biology

Q.13 The frequency of allele if it is evolutionary successful is?

A. increased

B. Enzymes

C. no change

D. All of these

28 / 100

Category: Biology Ch 9 Class 11

The flower of family gramineae process contain two scales below ovary which are called:

NUMS 2014
Biology
Kingdom Plantae
Elimination Tool:

A) Glumes

B) Lemma and palea

C) Lodicule

D) Rochella

29 / 100

Category: Biology Ch 13 Class 12

Study of environmental relations is called:

NUMS 2018
Biology
Man and His Environment
Elimination Tool:

A) Physiology

B) Pulmonology

C) Morphology

D) Ecology

30 / 100

Category: Biology Ch 4 Class 12

Example of ovoviviparous

Reptiles

Mammal s

Duckbill platypus

Frog

31 / 100

Category: Biology Ch 10 Class 11

Which of the following phylum and its examples is NOT correct?

NUMS 2017
Biology
Kingdom Animalia
Elimination Tool:

A) Nematoda… Ascaris and hookworm

B) Annelid … Nereis and leech

C) Echinodermata … sea star and brittle star

E) Cnidaria … Euplectell and bath sponge

32 / 100

Category: Biology

Q.25 The substrate of the trypsin is:

A. Proteins

B. Dipeptides

C. Polypeptides

D. Amino acids

33 / 100

Category: Biology

Q.39 If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules?

A.5

B.6

C.7

D. 8

34 / 100

Category: Biology Ch 1 Class 12

Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.

Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment

Trimethyl alanine

Ammonia

Trimethylamine oxide

35 / 100

Category: Biology Ch 10 Class 12

In the Hardy – Weinberg principle, p2 + 2pq + q2 = 1 . q2 represents the frequency of the:

NTS 2010
Biology
Evolution
Elimination Tool:

A) Homozygous dominant

B) Heterozygous dominant

C) Heterozygous recessive

D) Homozygous recessive

36 / 100

Category: Biology

Q.56 Which of the following is nota viral disease?

A. Smallpox

Mumps

C. Tetanus

D. Cowpox

37 / 100

Category: Biology Ch 2 Class 11

Which of the following amino acids has single codon?

NUMS 2014
Biology
Biological Molecules
Elimination Tool:

A) Isoleucine

B) Tryptophan

C) Valine

D) Arginine

38 / 100

Category: Biology Ch 6 Class 12

In a typical nucleotide, the nitrogenous base is attached to _______ carbon of pentose sugar.

NTS 2010
Biology
Chromosomes and DNA
Elimination Tool:

B) 5th

C) 4th

D) 3rd

E) 1st

39 / 100

Category: Biology Ch 11 Class 12

Which statement is true?

Producers are heterotrophic organisms

Consumers are autotrophic organisms

Fungi and bacteria are decomposers

Consumers release chemical elements as ions

40 / 100

Category: Biology Ch 4 Class 12

Male and female sea urchins release their sperm and eggs Into the water where fertilization takes place. How can their reproduction be described?

NTS 2013
Biology
Reproduction
Elimination Tool:

A) asexual reproduction which results in genetically dissimilar offspring

B) asexual reproductlon whlch results In genetically identical offspring

C) Sexual reproduction which results in genetically dissimilar offspring

D) Sexual reproduction which results in genetically identical offspring

41 / 100

Category: Biology Ch 8 Class 11

Fungi whose growth is favored by fire is called:

NTS 2016 SMBBMC
Biology
Kingdom Fungi
Elimination Tool:

A) Pyrophilus

B) Prophilus

C) Philus

D) Prephylus

42 / 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

43 / 100

Category: Biology Ch 7 Class 12

Condensation of chromosomes reaches to the maximum during:

NUMS 2015
Biology
Cell Cycle
Elimination Tool:

A) Zygote

B) Pachytene

D) Diakinesis

C) Diplotene

44 / 100

Category: Biology Ch 4 Class 11

Lysosomes are also called:

NTS 2012
Biology
Cell Structure and Function
Elimination Tool:

A) Suicide Sacs

B) Chondriosome

C) Storage organelle

D) Dicytosome

45 / 100

Category: Biology Ch 4 Class 12

In cloning, nucleus is introduced into

Somatic cell

Egg cell

Sperm cell

None of thes

46 / 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

47 / 100

Category: Biology

The idea that opposed the idea of abiogenesis was proposed by?

NUMS Mock 4
Biology
Cell Structure and Function

A) Robert Hooke

B) Robert Brown

C) Rudolph Virchow

D) Lorenz Oken

48 / 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

49 / 100

Category: Biology Ch 3 Class 12

Which hormone is chemically a steroid?

NUMS 2020
Biology
Coordination and Control
Elimination Tool:

A) ADH

B) Thyroxin

C) Cortisone

D) Insulin

50 / 100

Category: Biology

Q.61 Herbivores always occupy :

A. T1

B. T3

C. T2

D. T4

51 / 100

Category: Biology

Which of the following RNA sequences would be transcribed from the DNA sequence ATGGCTAGGAC?

NUMS Mock 4
Biology
Chromosomes and DNA

A) TACGGATCCTG

B) UAGCGAUCCUG

C) AUGCCUAGGAC

D) UACCGAUCCUG

52 / 100

Category: Biology Ch 4 Class 12

Pituitary gland releases ______ hormone and _______ hormone while ovaries produce _______ and progesterone.

NTS 2019
Biology
Reproduction
Elimination Tool:

A) Follicle-stimulating and luteinizing, estrogen

B) Estrogen and follicle-stimulating, luteinizing

C) Luteinizing arid estrogen, follicle-stimulating

D) Follicle-stimulating and estrogen, luteinizing

53 / 100

Category: Biology Ch 13 Class 11

Most oxygen is transported in the blood:

NUMS 2018
Biology
Gaseous Exchange
Elimination Tool:

A) In the form of bicarbonate ions.

B) Bound to albumin compounds.

C) Dissolved in the plasma.

E) Bound to hemoglobin.

54 / 100

Category: Biology Ch 5 Class 12

Sertoli cells

Provide liquid medium to cells in testes

Provide protection and nourishment to cells

Secrete testosterone

Both a and b

55 / 100

Category: Biology

Q.6 All of the following are the functions of endoplasmic reticulum except:

A. Nerve impulse conduction

B. Transport of material

C. Mechanical support

D. Synthesis of conjugated molecules

56 / 100

Category: Biology Ch 13 Class 11

During breathing air from Pharynx enters to:

UHS 2018
Biology
Gaseous Exchange
Elimination Tool:

A) Trachea

B) Bronchioles

C) Alveoli

D) Bronchi

57 / 100

Category: Biology Ch 8 Class 11

Those fungi which can grow only on their living host and cannot be grown on available defined growth culture medium e.g. various mildews and most rust species are called?

PMC Sample 2
Biology
Kingdom Fungi
Elimination Tool:

A) Parasitic fungi

B) Facultative parasitic fungi

C) Obligate parasitic fungi

D) all of these

58 / 100

Category: Biology

The smaller (40S) of ribosome combines with larger subunit (60S) in the presence of Mg2+ ion to form _____ particle.

NUMS Mock 3
Biology
Cell Structure and Function

A) 100 S

B) 90 S

C) 80 S

D) 70 S

59 / 100

Category: Biology Ch 5 Class 12

A bean seed contains all of the following except:

NTS 2012
Biology
Growth and Development
Elimination Tool:

A) A seed coat

B) An epicotyl

C) A hypocoty

D) A hypha

60 / 100

Category: Biology Ch 1 Class 11

The atoms of different elements combine with each other through ionic or covalent bonding to produce compounds this stable form is called:

An organ

Tissue

Both a and c

61 / 100

Category: Biology Ch 2 Class 11

Cn(H2O)n. is a general formula of :

Monosaccharides

Oligosaccharides

Ploysacharides

62 / 100

Category: Biology Ch 10 Class 11

Despite the structural diversities, ____ are characterized by having a soft body protected by a calcareous shell developing from the mantle layer.

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Corals

B) Foraminiferos

C) Molluscs

D) None of these

63 / 100

Category: Biology Ch 7 Class 11

In which of the following growth phases, the number of bacteria increases the most rapidly?

NTS 2018
Biology
Kingdom Protista
Elimination Tool:

A) Lag phase

B) Log phase

C) Stationary phase

D) Death / Decline phase

64 / 100

Category: Biology

Q.57 Which of the following is paired correctly?

A. Pisces-jellyfish

B. Echinodermata- cuttlefish

C. Mollusca- starfish

D. Arthropoda- silver fish

65 / 100

Category: Biology Ch 1 Class 12

Which of the following types of transpiration account for 5 – 7 % of total transpiration that take place in plants?

NUMS 2019 Cancelled
Biology
Homeostasis
Elimination Tool:

A) Cuticular

B) Lenticular

C) Stomatal

D) Leaves

66 / 100

Category: Biology Ch 5 Class 11

Those organisms which can prepare their own food from simple inorganic material and can store energy are called

Autotrophs

Heterotrophs

Procariotique

Eu-cariotique

67 / 100

Category: Biology Ch 14 Class 11

What will happen, if there is an increase in plasma albumin?

NUMS 2014
Biology
Transport
Elimination Tool:

A) Increased blood pressure

B) Increased rate of heart

C) Greater accumulation of tissue fluid

D) Decreased filtration in glomerulus

68 / 100

Category: Biology Ch 11 Class 11

The process by which one molecule of Glucose splits up into molecules of Pyruvate is called:

NTS 2018
Biology
Bioenergetics
Elimination Tool:

A) Glycolysis

B) Oxidative Phospholyration

C) Electron Transport Chain

D) Kreb's Cycle

69 / 100

Category: Biology Ch 7 Class 12

Each kinetochore gets ________ fibers in mitosis

5

4

3

2

70 / 100

Category: Biology Ch 3 Class 11

Optimum temperature for enzymes of human body is:

NUMS 2018
Biology
Enzymes
Elimination Tool:

A) 90 F

B) 95 F

C) 98 F

D) 100 F

71 / 100

Category: Biology

The bacteria can cope in unfavorable condition by producing:

NUMS Mock 4
Biology
Kingdom Prokaryote

A) Mesosomes

B) Zygospores

C) Endospores

D) Hyphae

72 / 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

73 / 100

Category: Biology Ch 6 Class 12

What would be the number of nucleotides for a protein molecule of about 142 amino acids?

NUMS 2020
Biology
Chromosomes and DNA
Elimination Tool:

A) 430

B) 142

C) 426

D) 460

74 / 100

Category: Biology Ch 4 Class 12

Which method is of asexual reproduction?

Sporulation

Fission

Apomixis

All of these

75 / 100

Category: Biology Ch 14 Class 11

Which of the following are found in both arteries and capillaries?

NTS 2015 SMBBMC
Biology
Transport
Elimination Tool:

A) Collagen fibres

B) Elastic fibres

C) Endothelial cells

D) Smooth muscle cells

76 / 100

Category: Biology

What do we call the cell surface membrane of a muscle fibre?

NUMS Mock 3
Biology
Support and Movement

A) Sarcolemma

B) Plasma membrane

C) Sarcoplasm

D) Myofibrils

77 / 100

Category: Biology Ch 4 Class 12

Which of the following is correct in humans?

NUMS 2015
Biology
Reproduction
Elimination Tool:

A) Both sperm and egg contain yolk

B) All genetic information comes from sperm

C) Sperm contains little cytoplasm

D) Fertilization commonly occurs in the uterus

78 / 100

Category: Biology Ch 6 Class 12

Which is incorrect?

Chromosomes 1st observed by walther Fleming

Chromosomal theory of inheritance 1st formulated by Walter Sutton

1st evidence of hereditary nature of DNA provided by Friedrich Meischer

. Sex chromosomes discovered by Thomas Hunt Morgan

79 / 100

Category: Biology

The cells which play a very important role in developing immunity are:

NUMS Mock 4
Biology
Transport

A) Monocytes

B) Neutrophils

C) Lymphocytes

D) Thrombocytes

80 / 100

Category: Biology Ch 3 Class 12

Na+ -K+ ATPase pump is important for:

Maintenance of resting potential.

Massive out flux of K+ after depolarization.

Recovery of resting potential.

Conversion of resting potential into action potential.

81 / 100

Category: Biology Ch 11 Class 12

Secondary succession starts from A.

A bar rock sand

Clear glacial pool

From remains of previous ecosystem

Fire

82 / 100

Category: Biology Ch 6 Class 12

In DNA A.

A forms two bonds with T

G forms three bonds with C

A forms three bonds with T

Both a and b

83 / 100

Category: Biology Ch 12 Class 11

Which enzyme present in the stomach curdles the milk?

NUMS 2016
Biology
Nutrition
Elimination Tool:

A) Rennin

B) Trypsin

C) Pepsin

D) Lipase

84 / 100

Category: Biology Ch 2 Class 12

Poliomyelitis normally affects the:

NUMS 2014
Biology
Support and Movement
Elimination Tool:

A) Legs

B) Brain

C) Spinal cord

D) Both B and C

85 / 100

Category: Biology Ch 2 Class 12

Pectoral fins are enlarged in:

NUMS 2015
Biology
Support and Movement
Elimination Tool:

A) Whales

B) Sharks

C) Skates

D) Plaice

86 / 100

Category: Biology Ch 4 Class 11

The first layer of cell wall which is formed is:

Primary wall

Secondary wall

Middle lamella

All of these

87 / 100

Category: Biology Ch 9 Class 12

This enzyme is used to cut DNA molecule in rDNA technology

PMC Sample 2
Biology
Biotechnology
Elimination Tool:

A) ligase

B) phosphatase

C) ribonuclease

D) restriction enzyme

88 / 100

Category: Biology Ch 9 Class 12

Which statement is not true about PCR?

Developed by Kary Mullis

Take its name from DNA polymerase

Is not very specific

Taq polymerase is used

89 / 100

Category: Biology

Which trait is not sex-linked recessive:

NUMS Mock 2
Biology
Variation and Genetics

A) Haemophilia

B) Colour blindness

C) Hypophosphatemia

D) TFM syndrome

90 / 100

Category: Biology Ch 12 Class 12

Desert ecosystem of Mianwali is

Thar

Thal

Cholistan

None

91 / 100

Category: Biology Ch 10 Class 12

The genetic change in a population caused by natural selection is called?

PMC Sample 1
Biology
Evolution
Elimination Tool:

A) polymorphism

B) specialization

C) gene linkage

D) adaptation

92 / 100

Category: Biology Ch 9 Class 12

Transgenic plants are produced when foreign genes are introduced into

Mature plant embryo

Immature plant embryo

Roots

Leaves

93 / 100

Category: Biology Ch 9 Class 12

Which of the following is not necessary for PCR to occur?

PMC 2020
Biology
Biotechnology
Elimination Tool:

A) dATP

B) Primers

C) DNA fragments

D) Ribonucleotides

94 / 100

Category: Biology Ch 3 Class 11

An enzyme increases the speed of a reaction:

NTS 2012
Biology
Enzymes
Elimination Tool:

A) by adding activation energy requirements

B) by lowering the activation energy requirements

C) by decreasing the concentration of products

D) by increasing the concentration of products

95 / 100

Category: Biology

Q.38 Testosterone is produce by which of the following?

A. Sertoli cells

B. Germinal epithelial cells

C. Interstitial cells

D. Nurse cells

96 / 100

Category: Biology Ch 7 Class 11

Radiolarians belong to which of the following protozoal group?

Zooflagellates

Actinopods

Foraminifera

Apicomplexans

97 / 100

Category: Biology Ch 6 Class 11

Which of the following statement is incorrect regarding germ theory of diseases postulated by Robert Koch?

A specific organism can always be found in association with a given disease

The organism can be isolated and grown in pure culture in the laboratories

The pure culture cannot produce the disease when inoculated into susceptible animal however the causative organism isolated from pure culture can do so.

It is possible to recover the organism in pure culture from the experimentally infected animals.

98 / 100

Category: Biology Ch 2 Class 11

Which of the following is an unsaturated fatty acid?

PMC 2020
Biology
Biological Molecules
Elimination Tool:

A) Oleic acid

B) Palmitic acid

C) Butyric acid

D) Acetic acid

99 / 100

Category: Biology Ch 3 Class 12

Type of sensations carried by nociceptors are:

Touch

Temperature

Pressure

Pain

100 / 100

Category: Biology Ch 12 Class 11

Optimum pH for action of pepsin and salivary amylase is

NTS 2016 DUHS & JSMU
Biology
Nutrition
Elimination Tool:

A) 3.5 and 7.7 respectively

B) 1.8 and 6.8 respectively

C) 6.8 and 7.4 respectively

D) 1.8 and 7.4 respectively

Your score is

The average score is 52%

0%

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