Biology Practice Test 1

Created by Ali Durrani

MDCAT Practice Tests

Biology Practice Test 1

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1 / 100

Category: Biology

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

NUMS Mock 2
Biology
Gaseous Exchange

A) Histoplasmosis

B) Tuberculosis

C) Cystic fibrosis

D) None of the given options

2 / 100

Category: Biology Ch 7 Class 12

At the beginning of nuclear division, the number of microtubule triplets in two pairs of centrioles that migrate to opposite poles are:

UHS 2015
Biology
Cell Cycle
Elimination Tool:

A) 9

B) 18

C) 108

D) 36

3 / 100

Category: Biology Ch 1 Class 11

Biological sciences have a set methodology and it is based on

Experimental inquiry

Esthetic preference

Philosophical ideas

Imaginations

4 / 100

Category: Biology Ch 1 Class 11

A structure formed by groups of similar cells organized into loose sheetsor bundles performing similar functions is called as:

An organ

An organism

A Tissue

A Cell

5 / 100

Category: Biology Ch 6 Class 12

Locus is defined as:

NUMS 2019 Reconduct
Biology
Chromosomes and DNA
Elimination Tool:

A) Position of a gene on the chromosome

B) Appearance of a trait in an individual

C) Partner of a gene pair

D) Gene in an individual for a trait

6 / 100

Category: Biology Ch 7 Class 11

Stentor is a/an

Ciliate

Foraniniferan

Actinopods

Apicomplexan

7 / 100

Category: Biology Ch 3 Class 12

Which of the following is antagonist to Auxin in terms of promotion of stem growth?

Gibberellins

Cytokinins

Abscisic Acid

none of these.

8 / 100

Category: Biology

Which of the following single membranous organelle is absent in plant cells?

a. Vacuole

B. Golgi apparatus

C. Lysosomes

D. Endoplasmic reticulum

9 / 100

Category: Biology

Q.42 All of the following are paired facial bones except:

A. Maxilla

B. Lacrimal

C. Zygomatic

D. Mandible

10 / 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

11 / 100

Category: Biology Ch 10 Class 12

There existed two varieties of female freshwater Mollusks in which some were streamlined and some had a high bulge. Over the generations, male freshwater Mollusks learned that high bulge favors more production of offspring. So they started preferring to mate with females having high bulge as compared to streamlined. Will this affect Hardy Weinberg Equilibrium in the population?

NTS 2019
Biology
Evolution
Elimination Tool:

A) No, it will not affect the Hardy Weinberg equilibrium

B) Yes, it will affect the Hardy Weinberg equilibrium

C) It will help to balance equilibrium

D) The Hardy Weinberg equilibrium doesn't apply here

12 / 100

Category: Biology Ch 3 Class 11

If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of

Enzymes get denatured at higher substrate conc.

Rate of reaction is indirectly proportional to substrate concentration at this point.

All the active sites on enzyme molecule are occupied.

None of these.

13 / 100

Category: Biology Ch 5 Class 12

Over-secretion of cortical hormone causes a disease called;

UHS 2015
Biology
Growth and Development
Elimination Tool:

A) Cushing’s Disease

B) Diabetes Mellitus

C) Hypoglycemia

D) Addison’s Disease

14 / 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

15 / 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

16 / 100

Category: Biology

In human gut, chylomicrons are formed by the combination of:

NUMS Mock 1
Biology
Nutrition

A) Proteins and carbohydrates

B) Fats and proteins

C) Fats and carbohydrates

D) Vitamins and fats

17 / 100

Category: Biology Ch 10 Class 11

Which one of the following does not have intermediate host?

NUMS 2016
Biology
Kingdom Animalia
Elimination Tool:

A) Tapeworm

C) Liver fluke

B) Ascaris

D) Plasmodium

18 / 100

Category: Biology Ch 10 Class 11

Which one of the following is a fish?

NTS 2012
Biology
Kingdom Animalia
Elimination Tool:

A) Flying fish

B) Salmon

C) Sea horse

D) All of the above

19 / 100

Category: Biology Ch 14 Class 11

Which of the following blood vessels have the highest pressure of blood?

NUMS 2020
Biology
Transport
Elimination Tool:

A) Aorta

B) Pulmonary arteries

C) Pulmonary veins

D) Vena Cava

20 / 100

Category: Biology Ch 1 Class 12

Excretory system, consisting of protonephridia tubes, are present in phylum:

NUMS 2020
Biology
Homeostasis
Elimination Tool:

A) Porifera

B) Annelida

C) Platyhelminthes

D) Cnidaria

21 / 100

Category: Biology Ch 13 Class 12

Balance in the nutrient cycle can be upset when

Too much food is consumed

Not enough food is produced

Decayed nutrients are not returned to the ground

All of these

22 / 100

Category: Biology Ch 14 Class 11

Highest blood pressure is found in:

NUMS 2015
Biology
Transport
Elimination Tool:

A) Arteries

B) Veins

D) None of the given options

C) Capillaries

23 / 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

24 / 100

Category: Biology Ch 8 Class 12

A child with AB blood group who was born to a mother of the genotype IAIA cannot have the father of the genotype:

NUMS 2014
Biology
Variation and Genetics
Elimination Tool:

A) IA IA

B) IB IB

C) IB IO

D) IB IB and IB IO

25 / 100

Category: Biology Ch 12 Class 11

_____ is activated to ______ by enterokinase / enteropeptidase enzyme secreted the lining of duodenum:

NUMS 2019 Cancelled
Biology
Nutrition
Elimination Tool:

A) Pepsinogen, pepsin

B) Trypsinogen, trypsin

C) Pepsinogen, trypsin

D) Chymotrypsinogen, chymotrypsin

26 / 100

Category: Biology Ch 4 Class 12

A major constituent of contraceptive pills is:

NUMS 2016
Biology
Reproduction
Elimination Tool:

A) Estrogen

B) Progesterone

C) Prolactin

D) Testosterone

27 / 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

28 / 100

Category: Biology Ch 3 Class 11

Optimal temperature of enzymes present in human body is

27?C

37?C

47?C

30?C

29 / 100

Category: Biology Ch 12 Class 12

Desert ecosystem of Mianwali is

Thar

Thal

Cholistan

None

30 / 100

Category: Biology Ch 10 Class 12

According to the Hardy-Weinberg theorem, what will be the frequency of heterozygote when ‘p’ is 0.2?

NUMS 2019 Reconduct
Biology
Evolution
Elimination Tool:

A) 0.32

B) 0.38

C) 0.42

D) 0.48

31 / 100

Category: Biology Ch 8 Class 11

Saccharomyces cerevisiae is the scientific name of a:

NUMS 2017
Biology
Kingdom Fungi
Elimination Tool:

A) Fungus

B) Smut

C) Bacterium

D) Yeast

32 / 100

Category: Biology Ch 2 Class 11

Which one is the basic element of organic compounds ?

Oxygen

Hydrogen

Sulphur

Carbon

33 / 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

34 / 100

Category: Biology Ch 10 Class 11

An amphibian’s heart has ______ chambers:

NUMS 2016
Biology
Kingdom Animalia
Elimination Tool:

A) Two

B) Three

C) Four

D) Five

35 / 100

Category: Biology

How many fatty acid molecules are normally present in a fat or oil molecule?

NUMS Mock 4
Biology
Biological Molecules

A) 1

B) 2

C) 3

D) 4

36 / 100

Category: Biology Ch 6 Class 11

Flagella originate from

Cell membrane

Cell wall

Capsule

Basal body

37 / 100

Category: Biology Ch 13 Class 12

Flow of energy in an ecosystem is:

NUMS 2014
Biology
Man and His Environment
Elimination Tool:

A) Unidirectional

B) Tridirectional

C) Multidirectional

D) Bidirectional

38 / 100

Category: Biology

The spectrum of He is expected to be similar to that of:

NUMS Mock 4
Chemistry
Atomic Structure

A) Hydrogen

B) Sodium

C) Oxygen

D) Li+

39 / 100

Category: Biology Ch 6 Class 12

The length of okazaki fragments in eukayotes is

150–250 nucleotides long

200-300 nucleotides

1000-2000 nucleotde

100-200 nucleotides

40 / 100

Category: Biology Ch 7 Class 12

If a person has 44 autosomes + XXY, he will suffer from

UHS 2012
Biology
Cell Cycle
Elimination Tool:

A) Klinefelter’s syndrome

B) Down’s syndrome

C) Turner’s syndrome

D) Edward’s syndrome

41 / 100

Category: Biology Ch 11 Class 11

Molecular formula of chlorophyll ‘a’ molecule is:

C55H72O5N4Mg

C55H70O6N4Mg

C50H72O6N4Mg

C55H70O5N4Mg

42 / 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

43 / 100

Category: Biology Ch 7 Class 12

Reverse of prophase is

Interphase

Metaphase

Anaphase

Telophase

44 / 100

Category: Biology Ch 10 Class 11

In most triploblasts after embryonic development the three layers are represented as

Separate layers of cells

Structures formed from them

Structures associated with them

Their functions in body

45 / 100

Category: Biology

Q45 Which was the first virus to be successfully crystalized?

A. TMV

B. Smallpox

C. Poliovirus

D. Adenovirus

46 / 100

Category: Biology Ch 8 Class 11

The ecological role of fungi as decomposers is paralleled only by

UHS 2010
Biology
Kingdom Fungi
Elimination Tool:

A) Prions

B) Algae

C) Bacteria

D) Viruses

47 / 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

48 / 100

Category: Biology

Q.16 Which of the following changes length during sarcomere contraction?

A. Thick filaments

B. Thin filaments

C.H zone

D. all of these Inco

49 / 100

Category: Biology Ch 3 Class 11

Antibodies can be digested by using which of the following types of enzymes?

PMC Sample 3
Biology
Enzymes
Elimination Tool:

A) Lipase

B) Protease

C) Amylase

D) Polymerase

50 / 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

51 / 100

Category: Biology Ch 6 Class 12

During DNA replication ______ attaches the fragment to the lagging strand.

NUMS 2019 Reconduct
Biology
Chromosomes and DNA
Elimination Tool:

A) Ligase

B) Invertase

C) Helicase

D) Topoisomerase

52 / 100

Category: Biology Ch 8 Class 12

A continuously varying trait is encoded by alleles of two or more different genes located at different loci, all influencing the same trait in an additive way is known as ________.

NUMS 2019 Cancelled
Biology
Variation and Genetics
Elimination Tool:

A) Poly traits

B) Polygenes

C) Multiple alleles

D) Different gene

53 / 100

Category: Biology

Q.44 When calcium gates of the smooth endoplasmic reticulum are open, then calcium is released into:

A. Cytosol

B. Organelle lumen

C. Nucleoplasm

D. Directly taken up by myofilament

54 / 100

Category: Biology Ch 7 Class 11

Chalk is gradually formed of dead

Actinopods

Foraminiferans

Apicomplexans

Radiolarians

55 / 100

Category: Biology

A man who has type AB blood cannot father a child with type ___ blood, because he would pass on either the ___ or the B allele to all of his offspring.

NUMS Mock 4
Biology
Variation and Genetics

A) A,O

B) O,A

C) B, O

D) B, A

56 / 100

Category: Biology Ch 4 Class 11

Who opposed the idea the cell is an empty space bounded by thick wall?

Lorenz Oken

Schwann

Robert Brown

Rudolph Virchow

57 / 100

Category: Biology Ch 14 Class 11

Which of the following has oxygenated blood?

NUMS 2014
Biology
Transport
Elimination Tool:

A) Renal veins

B) None

C) Pulmonary artery

D) Hepatic portal veins

58 / 100

Category: Biology

Q.18 Which of these is not a reflex action?

A, Secretion of sweat

B. salivation

C. Flexion due to needle prick

D. blinking of eyes due to strong light

59 / 100

Category: Biology

The function of respiratory passage, Cilia is to keep the airways clear of:

NUMS Mock 4
Biology
Gaseous Exchange

A) Carbon dioxide

B) Oxygen

C) Dust

D) Carbon Monoxide

60 / 100

Category: Biology Ch 11 Class 12

Plants growing in xeric conditions are called

Spherophytes

Mesophytes

Xerophytes

Teridophytes

61 / 100

Category: Biology Ch 11 Class 11

Which of the following statement about the head of a chlorophyll molecule is incorrect:

It is a porphyrin ring or tetrapyrrole ring structure

It is flat, square and light absorbing

Composed of carbon and nitrogen atoms with Magnesium as central metal ion, which is coordinated with nitrogen.

It is hydrophobic

62 / 100

Category: Biology Ch 14 Class 11

An example of passive acquired immunity is?

NTS 2015 DUHS and JSMU
Biology
Transport
Elimination Tool:

B) use of polio vaccine

C) passing of certain antibodies to the foetus by the pregnant women

D) inoculation of antitoxin in the case of puncture wound

E) both C and D

63 / 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

64 / 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

65 / 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

66 / 100

Category: Biology

DNA fingerprinting is basically done for:

NUMS Mock 1
Biology
Biotechnology

A) DNA cloning

B) DNA analysis

C) DNA sequencing

D) DNA splicing

67 / 100

Category: Biology Ch 11 Class 11

How does chemosynthesis differ from photosynthesis?

NUMS 2020
Biology
Bioenergetics
Elimination Tool:

A) Source of energy to carry out the reaction

B) Production of organic compounds

C) Reduction of CO2

D) Carried out by bacteria

68 / 100

Category: Biology

Q.39 Which of the following genetic diseases is caused by mutations in a membrane protein?

A. Alzheimer's disease

B. Parkinson's disease

C. Anemia

D. Hemolytic anemia

69 / 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

70 / 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

71 / 100

Category: Biology Ch 12 Class 11

Amylase is not produced by the following type(s) of salivary gland:

NUMS 2015
Biology
Nutrition
Elimination Tool:

A) Parotid

B) Submandibular

C) Sublingual

D) None of the given options are correct

72 / 100

Category: Biology Ch 3 Class 11

Enzymes work by which of the following?

PMC Practice 1
Biology
Enzymes
Elimination Tool:

A) Increasing the activation energy

B) Reducing the activation energy

C) Making exergonic reactions endergonic

D) Making endergonic reactions exergonic

73 / 100

Category: Biology Ch 10 Class 11

The animals in which coelom is formed due to splitting of mesocerm are known as

Pseudocoelous

Schizocoelous

Enterocoelous

Emphicoelous

74 / 100

Category: Biology

Pick the correct option about Drosophila.

NUMS Mock 3
Biology
Variation and Genetics

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

75 / 100

Category: Biology

A person got an infection, he became ill but then he survived. What do you think which of immunity he would have developed?

NUMS Mock 1
Biology
Transport

A) Active immunity

B) Artificially induced active immunity

C) Passive immunity

D) Naturally induced active immunity

76 / 100

Category: Biology

Q4 The branch that deals with the study of viruses fs known as?

A.. Entomology

B. Bacteriology

Virology

D. Epidemiology

77 / 100

Category: Biology Ch 13 Class 11

Oxygen contents per liter of air is

10 ml

100 ml

200 ml

100ml

78 / 100

Category: Biology Ch 11 Class 11

Which of the following is a chemical link between catabolism and anabolism?

AMP

ADP

ATP

All of these

79 / 100

Category: Biology Ch 7 Class 12

The term bivalent means:

NUMS 2014
Biology
Cell Cycle
Elimination Tool:

A) Two chromatids

B) Two chromosomes

C) Four chromatids

D) Four chromosomes

80 / 100

Category: Biology Ch 8 Class 12

Phenotype for both TT and Tt is tall, so the allele T is known as:

NUMS 2019 Cancelled
Biology
Variation and Genetics
Elimination Tool:

A) Dominant

B) Recessive

C) Homozygous

D) Heterozygous

81 / 100

Category: Biology Ch 11 Class 11

3-Phosphoglycerate in the presence of ATP and reduced NADP (from the light-dependent stage) is reduced to:

NUMS 2020
Biology
Bioenergetics
Elimination Tool:

A) Ribulose bisphosphate

B) 6 carbon compound

C) 5 carbon compound

D) 3 carbon compound

82 / 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

83 / 100

Category: Biology Ch 12 Class 11

Chlorosis refers to the lack of:

NUMS 2016
Biology
Nutrition
Elimination Tool:

A) Growth

B) Chlorophyll

C) Yellowing of leaf margin

D) Width of leaf

84 / 100

Category: Biology Ch 2 Class 12

Pseudopodia are:

NTS 2016 DUHS & JSMU
Biology
Support and Movement
Elimination Tool:

A) False feet developed in some unicellular organisms

B) Small hairlike structures present on the unicellular organisms

C) Long, like structures coming out of the mouth

D) Suckers which are attached to the walls of intestines

85 / 100

Category: Biology

Which type of protein structure contains the three dimensional structure?

NUMS Mock 3
Biology
Biological Molecules

A) Primary

B) Secondary

C) Tertiary

D) Quaternary

86 / 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

87 / 100

Category: Biology Ch 3 Class 11

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

PMC Practice 3
Biology
Enzymes
Elimination Tool:

A) Coenzyme

B) Prosthetic group

C) Cofactor

D) Apoenzyme

88 / 100

Category: Biology

Q.18 Pick the incorrect pair:

A. Lovastatin – Lowers blood cholesterol

B. Cyclosporine – Prevents transplant rejection

C. Ergotine -Migraine relieve

D. Griseofulvin – Inhibit bacterial growth

89 / 100

Category: Biology

The Latin words of the name given to a human being, Homo Sapiens, include the:

NUMS Mock 1
Biology
Bio-diversity | Variety of Life

B) Family and order

C) Order and class

D) Genus and class

E) Genus and species

90 / 100

Category: Biology

Q.22 What are T Cells and their rolelin IHV infection?

A. A type lymphocytes

B. Present in blood and work as detence systein

C.They kill the ioreign invader

D. All of these

91 / 100

Category: Biology

Q.32 Which one of the following is not a feature of the nervous system of Planaria?

A. Neurons are differentiated into sensory, motor and associative neurons.

B. Nerves are present.

C. No specialized sensory organs are present

D. All of the above.

92 / 100

Category: Biology

An enzyme that helps in the conversion of RNA to DNA is called:

NUMS Mock 3
Biology
Chromosomes and DNA

A) Transcriptase

B) Polymerase

C) Reverse transcriptase

D) Synthetase

93 / 100

Category: Biology Ch 12 Class 11

Digestion of which food components starts from the oral cavity?

NUMS 2020
Biology
Nutrition
Elimination Tool:

A) Proteins

B) Fats

D) Vitamins

C) Carbohydrates

94 / 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

95 / 100

Category: Biology Ch 4 Class 12

Which disorder among the following CANNOT be detected by amniocentesis?..

NTS 2019
Biology
Reproduction
Elimination Tool:

A) Haemophilia

B) Heart defects

D) Cystic fibrosis

C) Tay-Sachs disease

96 / 100

Category: Biology

Consider the following statements about biological communities.

I. Their members share a common gene pool

II. The community remains stable even though some physical aspect of the environment may undergo a change

III. It consists of all the populations living in a particular area.

IV. A community interacts with a non-living environment and both function together to form an ecosystem

Which two of the above statements are true?

NUMS Mock 4
Biology
Evolution

A) 1 and 2

B) 1 and 3

C) 2 and 4

D) 3 and 4

97 / 100

Category: Biology Ch 6 Class 11

The size of Spirochete is

0.1 -600 um

100-200 nm

500 um

0.75-1.25 um

98 / 100

Category: Biology

Q.51 The water splitting step of photosynthesis is called?

A Hydrolysis

B. Chemiosmosis

C. Photolysis

D. Photosynthesis

99 / 100

Category: Biology Ch 9 Class 11

Sporophyte is

Monoploid

Haploid

Diploid

Polyploidy

100 / 100

Category: Biology Ch 6 Class 12

Chromosomes are composed of

40% protein and 60% DNA

50% protein and 50% DNA

70% protein and 30% DNA

60% protein and 40% DNA

Your score is

The average score is 52%

0%

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