Biology Practice Test 2

Created by Ali Durrani

MDCAT Practice Tests

Biology Practice Test 2

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1 / 100

Category: Biology Ch 13 Class 12

Overgrazing results in:

NUMS 2019 Cancelled
Biology
Man and His Environment
Elimination Tool:

A) Totally barren lands

B) Good pastured lands

C) Salinity

D) Rocky areas

2 / 100

Category: Biology Ch 5 Class 11

HIV is a:

NUMS 2018
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Virus

B) Prions

C) Viroid

D) Venom

3 / 100

Category: Biology Ch 3 Class 12

Which body function is controlled through a positive feedback mechanism?

PMC 2020
Biology
Coordination and Control
Elimination Tool:

A) Labor contractions

B) Body temperature

C) Insulin production

D) Thyroxine release

4 / 100

Category: Biology Ch 1 Class 12

In a hot summer after noon, if your body’s Homeostatic machinery keep your internal temperature quite lower than that of external than this is an example of

Positive feed back

Negative feed back

. Feed back

Osmoregulation

5 / 100

Category: Biology Ch 2 Class 11

The branch of biology which deals with the study of chemical compounds and the chemical processes in the fliving organisms is called:

Chemistry

Biochemistry

Molocular biology

Both a and b

6 / 100

Category: Biology Ch 12 Class 11

Autotrophic organisms can exist in an exclusively ______ environment.

Organic

Inorganic

Wet

Terrestrial

7 / 100

Category: Biology Ch 9 Class 11

Antheridiophore and archegoniophore are found in

Marchantia

Funaria

Both of these

None of these

8 / 100

Category: Biology Ch 10 Class 11

Which one of the following coelenterate is also called the Portuguese man of war?

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Hydra

B) Velella

C) Obelia

D) Physalis

9 / 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

10 / 100

Category: Biology Ch 6 Class 12

Which statement is correct?

Leading strand elongates away from the replication fork

Lagging strand elongates towards the replication fork

Lagging strand is constructed discontinuously.

Both a and b

11 / 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

12 / 100

Category: Biology Ch 1 Class 12

Among the followings which is the most longest supportive cell?

Tracheids

Sclereids

Trachea

Collenchyma cells

13 / 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

14 / 100

Category: Biology Ch 6 Class 12

The chromosomes with equal arms are called:

NTS 2018
Biology
Chromosomes and DNA
Elimination Tool:

A) Metacentric

B) Submetacentric

C) Acrocentric

D) Telocentric

15 / 100

Category: Biology Ch 3 Class 12

Which type of the receptors are present in the ear?

Chemoreceptors

Mechanoreceptors

Photoreceptors

Thermoreceptors

16 / 100

Category: Biology

Q.7 The thalamus and the hypothalamus are located in which region of the brain?

A. brain stem

B. cerebrum

C. cerebellum

D. Diencephalon

17 / 100

Category: Biology

Q.19 Sm0oth endoplasmic reticulum is abundant in which types of cells?

A. lipid metabolism

B. protein metabolism

C. glucose metabolism

D. calcium metabolism

18 / 100

Category: Biology Ch 4 Class 11

Who coined the term CELL?

Schwann

Schleiden

Robert Hook

Both a and b

19 / 100

Category: Biology Ch 9 Class 11

What is an example of sperms of liverworts, mosses, ferns which move towards archegonia, in response to nucleic acid released by the ovum?

PMC Practice 7
Biology
Kingdom Plantae
Elimination Tool:

A) Chemotropic movement

B) Chemonastic movement

C) Haptonastic movement

D) Chemotactic movement

20 / 100

Category: Biology

Q.6 The uterus of the female reproductive system opens into the?

A. placenta

B. birth canal

C. cervix

D. all of these

21 / 100

Category: Biology Ch 2 Class 11

Haemoglobin exhibits a:

NUMS 2016
Biology
Biological Molecules
Elimination Tool:

A) Secondary structure

B) Primary structure

C) Quaternary structure

D) Tertiary structure

22 / 100

Category: Biology Ch 11 Class 11

Aerobic respiration results in how much ATP?

NUMS 2016
Biology
Bioenergetics
Elimination Tool:

A) 2

B) 36

C) 18

D) 32

23 / 100

Category: Biology

Q.56 During cyclic photophosphorylation, electrons are diverted back to:

A. Plastoquinone

B. Cytochrome complex

C. Plastocyanin

D. Ferredoxin

24 / 100

Category: Biology Ch 5 Class 11

Syphilis is caused by:

NUMS 2018
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Coccus

B) Bacillus

C) Spirillum

D) Spirochete

25 / 100

Category: Biology Ch 9 Class 12

DNA analysis is done to

Diagnose viral infections

Identify criminals

Determine evolution

All of these

26 / 100

Category: Biology Ch 8 Class 11

An association between two organisms benefiting both is called

UHS 2010
Biology
Kingdom Fungi
Elimination Tool:

A) Commensalism

B) Parasitism

C) Predation

D) Symbiosis

27 / 100

Category: Biology

Q.60 The part of spinal cord where interneurons present is called:

A. White matter

B. Gray mater

C. lumbar enlargement

D. cervical enlargement

28 / 100

Category: Biology Ch 9 Class 12

In recombinant DNA technology, the copies of recombinant DNA are increased by:

NTS 2018
Biology
Biotechnology
Elimination Tool:

A) Restriction enzyme

B) Ligase

C) Selection of host with rDNA

D) Multiplication of host with rDNA

29 / 100

Category: Biology

Which one of the following is common to all neurons?

NUMS Mock 3
Biology
Coordination and Control

A) A cell body which contains a nucleus

B) A thick myelin sheath

C) Presence of node of Ranvier

D) Presence of Schwann cells

30 / 100

Category: Biology Ch 3 Class 12

The sense organs of taste in tongue are known as:

NUMS 2014
Biology
Coordination and Control
Elimination Tool:

A) Olfactory receptors

B) Gustatory receptors

C) Cutaneous receptors

D) All of these

31 / 100

Category: Biology Ch 10 Class 12

Modification in the organization of the basic pentadactyl limb structure found in vertebrates provides good evidence for the principle of:

NUMS 2020
Biology
Evolution
Elimination Tool:

A) Adaptive radiation

B) Convergent evolution

C) Genetic drift

D) Inheritance of acquired characters

32 / 100

Category: Biology Ch 5 Class 11

The size of smallest virus is:

10 nm

20 nm

30 nm

40 nm

33 / 100

Category: Biology Ch 10 Class 12

Mating with non-relatives is known as?

PMC Sample 2
Biology
Evolution
Elimination Tool:

A) Inbreeding

B) Outbreeding

C) Breeding

D) None of these options is correct

34 / 100

Category: Biology

Q.54 Which of the following elements are not found in carbohydrates?

A.C

B.H

C.N

D. O

35 / 100

Category: Biology Ch 9 Class 11

Below the point at which the cotyledons are attached, the embryo axis is called _______.

NTS 2016 SMBBMC
Biology
Kingdom Plantae
Elimination Tool:

A) Radicle

B) Epicotyl

C) Hypocotyl

D) Coleoptile

36 / 100

Category: Biology Ch 11 Class 11

Many substances which are urgently required by the cell while cell absorbs them against the concentration gradient by utilizing energy in the form of:

NUMS 2019 Reconduct
Biology
Bioenergetics
Elimination Tool:

A) ATP

B) Heat

C) GTP

D) Light

37 / 100

Category: Biology Ch 4 Class 11

Resolution power of a compound microscope is

2.0 ?m

2-4 A

24 ?m

24 A

38 / 100

Category: Biology Ch 1 Class 12

Ammonia is chief excretory product in:

NUMS 2014
Biology
Homeostasis
Elimination Tool:

A) Reptiles

B) Turtles

C) Mammals

D) Fish

39 / 100

Category: Biology Ch 12 Class 11

Which of the following have both internal and external digestion?

NUMS 2016
Biology
Nutrition
Elimination Tool:

A) Hydra

B) Jelly fish

C) Cockroach

D) All of these

40 / 100

Category: Biology

Q.68 Enzymes are globular proteins because

A. They have a primary structure.

B. They have a secondary structure.

C They have a tertiary structure,

D. All of the above.

41 / 100

Category: Biology Ch 4 Class 12

The sexually transmitted disease, that can affect both the male and the female genitals and may damage the eyes of babies born of infected mothers is:

PMC Sample 1
Biology
Reproduction
Elimination Tool:

A) AIDS

B) Hepatitis

C) Gonorrhoea

D) All of these

42 / 100

Category: Biology Ch 3 Class 11

Identify the wrong statements.

(a) The substrate binds to active site of enzyme and not fitting into active site

(b) The binding of substrate induces the enzyme to alter its shape

(c) Chemical bonds of substrate break down not to form new enzyme-product complex

(d) The enzyme releases the products of the reaction and runs through catalytic cycle once again

NUMS 2019 Reconduct
Biology
Enzymes
Elimination Tool:

A) A, C

B) B, D

C) B, C

D) A, D

43 / 100

Category: Biology Ch 3 Class 11

Extreme change in pH results in:

Change in ionization of amino acids at the active site of the enzyme.

Change in the ionization of the substrate.

Denaturation of the enzyme

IncreaseIncrease in the reaction rate. in the reaction rate.

44 / 100

Category: Biology Ch 2 Class 12

The plants having thick cuticle, needle like reduced leaves and sunken stomata are termed as:

NUMS 2019 Reconduct
Biology
Support and Movement
Elimination Tool:

A) Hydrophytes

B) Neophytes

C) Mesophytes

D) Xerophytes

45 / 100

Category: Biology

Q.14 Protein coat of a virus enclosing nucleic acid is called?

A. Vector

B. Capsid

C. Plasmid

D. Genome

46 / 100

Category: Biology Ch 8 Class 12

Which traits are most likely to affect men than women?

PMC 2020
Biology
Variation and Genetics
Elimination Tool:

A) X linked recessive

B) X linked dominant

C) Autosomal dominant

D) Autosomal recessive

47 / 100

Category: Biology Ch 8 Class 12

______ are more common in human males than females.

NUMS 2016
Biology
Variation and Genetics
Elimination Tool:

A) X-linked dominant traits

B) X-linked recessive traits

C) Y-linked dominant traits

D) Autosomal linked recessive traits

48 / 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

49 / 100

Category: Biology Ch 9 Class 12

A method of DNA sequencing in which DNA threads are chemically cut into pieces of different sizes is

Sanger's method

Maxam-Gilbert method

Hamilton's method

Vortex method A

50 / 100

Category: Biology

The sympathetic nervous system causes which of the following?

NUMS Mock 2
Biology
Coordination and Control

A) Constriction of the pupil

B) Decreased heart rate

C) Increased gastric section

E) Increased respiration

51 / 100

Category: Biology Ch 2 Class 11

Which of the following has the ability to develop ester linkage with OH group of Pentose sugar?

NUMS 2019 Reconduct
Biology
Biological Molecules
Elimination Tool:

A) Purine

B) Pyrimidine

C) H3PO4

D) HNO3

52 / 100

Category: Biology Ch 3 Class 12

Which of the following statement about neuron is incorrect?

They not only conduct impulses but also generate them.

They are not the only cellular component of nervous system.

They may show limited regenerative capabilities.

Like all the living cell, when they mature and divide to form similar cells.

53 / 100

Category: Biology Ch 2 Class 12

Which one of the following forms the blk of exoskeleton of an arthropod?

Epicuticle

Procuticle

Ectocuticle

None of these

54 / 100

Category: Biology Ch 7 Class 12

Which of the following is a type of cell division that plays an important role in evolution?

NTS 2019
Biology
Cell Cycle
Elimination Tool:

A) meiosis

B) mitosis

C) apoptosis

D) amitosis

55 / 100

Category: Biology Ch 12 Class 11

Plants absorb it in the form of soluble phosphates. It is present abundantly in the growing and storage organs of plants. What is it?

NTS 2012
Biology
Nutrition
Elimination Tool:

A) H2O

B) CO2

C) K

D) P

56 / 100

Category: Biology Ch 12 Class 12

One of the most important cause of desertification is

Floods

Wind blowing

Raining

Deforestation

57 / 100

Category: Biology

HIV is a:

NUMS Mock 3
Biology
Bio-diversity | Variety of Life

A) Virus

B) Prions

C) Viroid

D) Venom

58 / 100

Category: Biology Ch 9 Class 11

“Vascular System absent; gametophyte dominant, sporophyte attached to gametophyte; homosporous” are distinguishing characters of

UHS 2010
Biology
Kingdom Plantae
Elimination Tool:

A) Psilopsida

B) Pteropsida

C) Angiosperms

D) Bryophyta

59 / 100

Category: Biology Ch 8 Class 12

Mendel concluded that each organism has two hereditary factors for each trait, now called:

NTS 2015 SMBBMC
Biology
Variation and Genetics
Elimination Tool:

A) Chromatids

B) Alleles

C) Chromosomes

D) None of the above

60 / 100

Category: Biology Ch 2 Class 12

Which of the following statement is incorrect about Molluscans?

They are surrounded by single or double pieces of hard skeleton.

Their shell grows as the animal grows.

They have hydrostatic skeleton

They move by tube feet

61 / 100

Category: Biology Ch 13 Class 11

Pharynx leads air into _____ through glottis.

NTS 2012
Biology
Gaseous Exchange
Elimination Tool:

A) Trachea

B) Bronchus

C) Alveoli

E) Larynx

62 / 100

Category: Biology Ch 10 Class 12

______ occurs because natural selection gives some alleles a better chance of survival than others:

PMC 2020
Biology
Evolution
Elimination Tool:

A) Fitness

B) Evolution

C) Crossing over

D) Artificial Selection

63 / 100

Category: Biology Ch 6 Class 11

Which of the following statements about the systemic effect of bacterial cells is true?

PMC Practice 3
Biology
Kingdom Prokaryote
Elimination Tool:

A) Gram-negative bacteria are more likely to cause systemic effects because they lack an outer membrane which means they can more quickly to infect host cells

B) Gram-negative bacteria are more likely to cause systemic effects because their outer membrane protects them from antibiotics

D) None of these options is correct

C) Both Options A and B are correct

64 / 100

Category: Biology

Q.25 For respiratory metabolism, bacterial cell membrane contains

A. Proteins

B. Lipids

C.Enzymes

D. Chemicals

65 / 100

Category: Biology Ch 5 Class 11

The complete, mature and infection virus particle is known as:

PMC 2020
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Venome

B) Genome

C) Virion

D) Capsid

66 / 100

Category: Biology

Q.61 Herbivores always occupy :

A. T1

B. T3

C. T2

D. T4

67 / 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

68 / 100

Category: Biology Ch 12 Class 11

Intrinsic factor is secreted by:

NUMS 2020
Biology
Nutrition
Elimination Tool:

A) Pancreas

B) Liver

C) Stomach

D) Duodenum

69 / 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

70 / 100

Category: Biology Ch 1 Class 12

Rapid movement of leaves of mimosa on touching is an example of :

Turgor movement

Nastic movement

Tropic movements.

Growth movement

71 / 100

Category: Biology Ch 1 Class 12

Which of the following reduces the rate of transpiration by adaptations in xerophytes?

NUMS 2019 Cancelled
Biology
Homeostasis
Elimination Tool:

A) Large surface area of leaves

B) Increase number of stomata

C) Thick waxy cuticle

D) Excessive loss of water

72 / 100

Category: Biology Ch 12 Class 11

The process of swallowing is controlled by:

NUMS 2016
Biology
Nutrition
Elimination Tool:

A) Hypothalamus

B) Hormones

C) Medulla oblongata

D) Sympathetic nervous system

73 / 100

Category: Biology Ch 9 Class 11

The most successful land adapting plants are:

NUMS 2020
Biology
Kingdom Plantae
Elimination Tool:

A) Mosses

B) Ferns

C) Gymnosperms

D) Angiosperms

74 / 100

Category: Biology Ch 11 Class 11

The main process that occurs in the dark reaction in photosynthesis is:

NTS 2010
Biology
Bioenergetics
Elimination Tool:

A) That water is split.

B) Light energy is converted into chemical energy.

C) That glucose is oxidized.

D) That carbon-dioxide is fixed.

75 / 100

Category: Biology Ch 12 Class 11

A psychological condition usually seen in girls and young women, with loss of appetite is:

NTS 2011
Biology
Nutrition
Elimination Tool:

A) Obesity

B) Malnutrition

C) Anorexia Nervosa

D) Dyspepsia

76 / 100

Category: Biology Ch 9 Class 11

Gymnosperms are referred to as “naked seeded plants”, because

NUMS 2016
Biology
Kingdom Plantae
Elimination Tool:

A) They lack ovule

B) They lack ovaries

C) The embryo is unprotected

D) They have no seed coat

77 / 100

Category: Biology Ch 5 Class 11

Vaccines for all of these have been developed EXCEPT:

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

A) Polio

B) Mumps

C) Measles

D) Cancer

78 / 100

Category: Biology Ch 8 Class 12

J. Seiler in 1914 discovered which type of sex determination in moths?

NUMS 2015
Biology
Variation and Genetics
Elimination Tool:

A) XO – XX

B) XY – XX

C) ZZ – ZW

D) None of the given options

79 / 100

Category: Biology Ch 4 Class 12

In cloning, nucleus is introduced into

Somatic cell

Egg cell

Sperm cell

None of thes

80 / 100

Category: Biology Ch 5 Class 11

Viruses are ______ smaller than bacteria

10 – 100 times

10 – 1000 times

1000 – 10000 times

81 / 100

Category: Biology Ch 1 Class 12

The condition of a stable internal environment in an organism is:

NTS 2015 SMBBMC
Biology
Homeostasis
Elimination Tool:

A) Coordination

B) Organisation

C) Homeostasis

D) Integration

82 / 100

Category: Biology Ch 4 Class 11

The basic structural framework of all types of membranes are:

NUMS 2020
Biology
Cell Structure and Function
Elimination Tool:

A) Phospholipids

B) Glycoproteins

C) Lipoproteins

D) Nucleoproteins

83 / 100

Category: Biology Ch 6 Class 12

A fern has _____ pairs of chromosomes.

NTS 2012
Biology
Chromosomes and DNA
Elimination Tool:

A) 23

B) 40

C) 500

D) 13

84 / 100

Category: Biology Ch 5 Class 12

The reason plants are considered totipotent is:

NUMS 2019 Cancelled
Biology
Growth and Development
Elimination Tool:

A) Each cell has full genetic potential of the organism

B) A single cell could become a complete plant

C) Because they have lesser potential for tissue culturing

D) Both each cell has full genetic potential of the organism and a single cell could become a complete plant

85 / 100

Category: Biology Ch 4 Class 11

Magnifying power of electron microscope as compared to eye is

500 X

250000X

500000X

250X

86 / 100

Category: Biology Ch 9 Class 11

Which type of leucoplasts store lipids?

NUMS 2020
Biology
Kingdom Plantae
Elimination Tool:

A) Amyloplast

B) Elaioplast

C) Proteinoplast

D) Etioplast

87 / 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

88 / 100

Category: Biology Ch 11 Class 11

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

Day time.

Night time

Dawn & Dusk

Mid night

89 / 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

90 / 100

Category: Biology Ch 12 Class 11

Dietary fiber passes through to several structures after leaving the stomach. In which order does the dietary fiber pass through the structures?

NTS 2015 DUHS and JSMU
Biology
Nutrition
Elimination Tool:

A) Duodenum -> jejunum -> ileum -> rectum -> colon

B) ileum -> duodenum -> colon -> jejunum -> rectum

C) ileum -> duodenum -> jejunum -> rectum -> colon

E) duodenum -> jejunum -> ileum -> colon -> rectum

91 / 100

Category: Biology Ch 1 Class 11

Which one is not correct for a productive theory?

It is predictive

It has explanatory power

It discourage s suggestion of different hypotheses

It discourages suggestion of different hypotheses

92 / 100

Category: Biology

DNA made by joining pieces from two or more different sources:

NUMS Mock 3
Biology
Biotechnology

A) Probes

B) Restriction endonuclease

C) Mutated DNA

D) Recombinant DNA

93 / 100

Category: Biology Ch 14 Class 11

The favourite host cells of the HIV-Virus are:

NUMS 2014
Biology
Transport
Elimination Tool:

A) Lymphocytes

B) RBCs

C) T-cells

D) B-cells

94 / 100

Category: Biology

Which of the following statements are true for mitochondria and chloroplasts?

A. ATP synthesis is seen in both
B. Outer membrane has more surface area in both
C. Circular naked DNA, RNA, and 70 ribosomes are seen in both
D. Oxidative phosphorylation occurs in both

NUMS Mock 4
Biology
Cell Structure and Function

A) A and B

B) B and C

C) A and C

D) A and D

95 / 100

Category: Biology Ch 12 Class 11

The leaf is bilobed with midrib between them. The plant is

Saraccnia

Dionaea

Pitcher plant

None of these

96 / 100

Category: Biology Ch 4 Class 11

The second most abundant bio element in the human body is:

NUMS 2020
Biology
Cell Structure and Function
Elimination Tool:

A) Oxygen

B) Carbon

C) Hydrogen

D) Nitrogen

97 / 100

Category: Biology Ch 8 Class 11

Parasitic fungi absorb nutrients directly from the living host cytoplasm with the help of special hyphal tips called

Mildew

Constricting ring

Haustoria

All of thes

98 / 100

Category: Biology Ch 7 Class 11

Which of the following bacteria are able to release oxygen into the environment?

NTS 2018
Biology
Kingdom Protista
Elimination Tool:

A) Saprotrophic bacteria

B) Parasitic bacteria

C) Cyanobacteria

D) Pathogenic bacteria

99 / 100

Category: Biology Ch 4 Class 12

Female rabbits are:

NUMS 2014
Biology
Reproduction
Elimination Tool:

A) induced ovulators

B) spontaneous ovulators

C) seasonal ovulators

D) indifferent ovulators

100 / 100

Category: Biology

Q.44 To produce ATP (adenosine triphosphate) in muscles, creatine phosphate (CP) transfers__________________ to adenosine diphosphate (ADP).

A. Oxygen

B. Adenosine

C. Cytosine

D. Phosphate

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