Biology Practice Test 5

Created by Ali Durrani

MDCAT Practice Tests

This is the Free Access to Limited MCQs. Enroll to PLS Boost Premium Bundle to Get More MCQs HERE

1 / 100

Category: Biology

Erythroblastosis foetalis occurs when:

NUMS Mock 2
Biology
Variation and Genetics

A) Mother is Rh-positive and baby is Rh-negative

B) Mother is Rh-negative and the baby is Rh-positive

C) Both mother and baby are Rh-negative

D) Both mother and baby are Rh-positive

2 / 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

3 / 100

Category: Biology Ch 1 Class 12

In humans, the temperature regulation control center is located in:

PMC 2020
Biology
Homeostasis
Elimination Tool:

A) Kidneys

B) Brain

C) Lungs

D) Liver

4 / 100

Category: Biology Ch 5 Class 11

Binomial nomenclature was proposed for the first time by:

NTS 2010
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Charles Darwin (1859)

B) Rudolph virchow (1855)

C) Louis Pasteur (1862)

D) Carolus Linnaeus (1707)

5 / 100

Category: Biology Ch 12 Class 11

When the liver fat content of our body increases, the condition leads to:

NUMS 2014
Biology
Nutrition
Elimination Tool:

A) Fatty liver

B) Necros liver

C) Jaundice

D) None of them

6 / 100

Category: Biology Ch 13 Class 12

Wind blows from area of

Low pressure to high pressure

High pressure to low pressure

Moderate pressure to high pressure

Low pressure to low pressure

7 / 100

Category: Biology Ch 2 Class 11

Which of the following processes is the reverse of condensation?

NTS 2016 SMBBMC
Biology
Biological Molecules
Elimination Tool:

A) Hydrolysis

B) Dehydration synthesis

C) Polymerization

D) Vapourization

8 / 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 3
Biology
Coordination and Control

A) I, III, II, and IV

B) I, IV, II and III

C) IV, I, III and II

D) IV, III, I and II

9 / 100

Category: Biology Ch 12 Class 11

Bile is used in:

NUMS 2016
Biology
Nutrition
Elimination Tool:

A) Protein digestion

B) Starch digestion

C) Fat emulsification

D) Both A and B

10 / 100

Category: Biology Ch 4 Class 11

Resolution power of a compound microscope is

2.0 ?m

2-4 A

24 ?m

24 A

11 / 100

Category: Biology Ch 2 Class 12

Hinge joint occurs in:

NTS 2015 SMBBMC
Biology
Support and Movement
Elimination Tool:

A) Elbow

B) Skull

C) Ankle

D) Backbone

12 / 100

Category: Biology Ch 1 Class 12

Most of the marine invertebrates are

Osmoconformers

Osmoregulators

Both depend upon the concentration of sea water

None of these

13 / 100

Category: Biology Ch 12 Class 11

The structure which prevents the entry of food particles into the respiratory passage is:

NUMS 2019 Cancelled
Biology
Nutrition
Elimination Tool:

A) Hard palate

B) Epiglottis

C) Soft palate

D) Larynx

14 / 100

Category: Biology

Q.28 The vocal cords are stretched across:

A. Larynx

B. Glottis

C. Pharynx

D. Trachea

15 / 100

Category: Biology Ch 5 Class 12

The most abundant organic molecule on the planet earth is:

NUMS 2016
Biology
Growth and Development
Elimination Tool:

A) Starch

B) Glycogen

C) Glucose

D) Cellulose

16 / 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

17 / 100

Category: Biology Ch 4 Class 12

Hydra reproduces asexually by:

NUMS 2014
Biology
Reproduction
Elimination Tool:

A) Binary fission

B) Multiple fission

D) Regeneration

C) Budding

18 / 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

19 / 100

Category: Biology Ch 9 Class 11

Bryophtes are called amphiabians of plant world because

Bryophytes like amphibian ancestors are one of the most primitive organisms in this world.

Bryophytes like amphibian live in damp shady places and close to water body.

Amphibians have close relation with bryophytes in their habitat.

All of these

20 / 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

21 / 100

Category: Biology Ch 10 Class 12

Change in frequency of alleles that occurs by chance Is called as:

UHS 2019
Biology
Evolution
Elimination Tool:

A) Genetic drift

B) Mutation

C) Migration

D) Natural selection

22 / 100

Category: Biology

The enzyme found in saliva responsible for the digestion of carbohydrates is:

NUMS Mock 4
Biology
Enzymes

A) Lysozyme

B) Amylase

C) Pepsin

D) Trypsinogen

23 / 100

Category: Biology Ch 11 Class 11

Molecular formula of chlorophyll ‘a’ molecule is:

C55H72O5N4Mg

C55H70O6N4Mg

C50H72O6N4Mg

C55H70O5N4Mg

24 / 100

Category: Biology

Q.47 The chemical nature of oxytocin is:

A. Protein

B. Amino acid derivative

C. Polypeptide

D. Steroid Incorrect

25 / 100

Category: Biology Ch 12 Class 11

Carbohydrates, fats & proteins are essential for:

Metabolic processes of an organism

Providing energy

Formation of sturctures

All of these

26 / 100

Category: Biology Ch 6 Class 12

Transfer of genetic material from one cell to another that can alter the genetic makeup of recipient cell is called

Mutation

Transuction

Replication

Variation

27 / 100

Category: Biology

Given figures shows:

NUMS Mock 4
Biology
Gaseous Exchange

A) Structure of Lenticel

B) Hydathode showing gaseous vapour exchange

C) Fungus reproducing by spore formation

D) Algae reproducing by spore formation

28 / 100

Category: Biology

Q.41 The period during which a girl sexually matures is called

A. Menstrual cycle

B. Puberty

C. Childhood

D. Teens

29 / 100

Category: Biology Ch 4 Class 12

In cloning, nucleus is introduced into

Somatic cell

Egg cell

Sperm cell

None of thes

30 / 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

31 / 100

Category: Biology Ch 2 Class 12

The number of muscles in a human body is about:

NTS 2012
Biology
Support and Movement
Elimination Tool:

A) 200

B) 300

C) 400

E) 600

32 / 100

Category: Biology

On receiving the news of the sudden demise of a close friend; which is the most probable hormone that is secreted at that time?

NUMS Mock 1
Biology
Coordination and Control

A) Prostaglandin

B) Growth inhibitors

C) Estrogen

D) Adrenaline

33 / 100

Category: Biology Ch 5 Class 12

All of the followings are the effects of red light on plant, EXCEPT:

NTS 2016 SMBBMC
Biology
Growth and Development
Elimination Tool:

A) Causes epicotyl (plumule) hook to unbend

B) Induces increase in leaf area

C) Elongation of internodes is promoted

D) Stimulate flowering in long day plants

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 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

36 / 100

Category: Biology

Q.17 Teichoic acids are the characters of:

A. Gram Positive bacteria

B. Mycoplasma

C. Gram Negative bacteria

D. Archaeobacteria

37 / 100

Category: Biology Ch 13 Class 11

Functional units of lungs are called

Alveoli

Air sacs

Parabronchi

None of these

38 / 100

Category: Biology

Q.65 Which of the following statements about the systemic affect of bacterial cells are true?

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

B. Gram-negative bacteria are more likely to cause Systemic effects because the outer membrane protects them from antibiotics

C. Both A and B

D. None of these

39 / 100

Category: Biology Ch 3 Class 12

Chemically auxins are

Indole propionic acid.

Indole carboxylic acid.

Indole acetaldehyde

Indole acetic acid

40 / 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

41 / 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

42 / 100

Category: Biology

Optimum pH for action of pepsin and salivary amylase is

NUMS Mock 2
Biology
Nutrition

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

43 / 100

Category: Biology Ch 11 Class 11

Cyanides are potent poisons of the living organism and can kill by inhibiting _____, essential for cellular respiration:

NUMS 2020
Biology
Bioenergetics
Elimination Tool:

A) Cytochrome oxidases

B) Dehydrogenases

C) Hydrolases

D) Nucleases

44 / 100

Category: Biology Ch 7 Class 11

Chalk is gradually formed of dead

Actinopods

Foraminiferans

Apicomplexans

Radiolarians

45 / 100

Category: Biology

The end product of glycolysis in anaerobic respiration is:

NUMS Mock 4
Biology
Bioenergetics

A) Ethanol and Carbon dioxide

B) Lactate

C) Pyruvate

D) Both A and B

46 / 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

47 / 100

Category: Biology Ch 9 Class 11

Which of the following is not a parasitic fungus of plants?

NUMS 2015
Biology
Kingdom Plantae
Elimination Tool:

A) Rust

B) Mildews

C) Armillaria

D) None of the given options

48 / 100

Category: Biology Ch 5 Class 11

Solanum tuberosum is a scientific name of:

Onion

Amaltas

Potato

Tomato

49 / 100

Category: Biology

Q.18 The internal buds are known as which of the following?

A. Spicules

B. Choanocytes

C. Gemmules

D. Both A and B

50 / 100

Category: Biology

In which of the following phases of bacterial growth, is the death rate more rapid than the multiplication rate?

NUMS Mock 2
Biology
Kingdom Prokaryote

A) Stationary phase

B) LAG phase

C) Decline phase

D) LOG phase

51 / 100

Category: Biology Ch 2 Class 11

Which of the following basic structural level of proteins is indicated by an association of two alpha and two beta chains in the haemoglobin molecule?

NTS 2018
Biology
Biological Molecules
Elimination Tool:

A) Primary structure

C) Tertiary structure

B) Secondary structure

D) Quatenary Structure

52 / 100

Category: Biology Ch 13 Class 12

When resources gets scarce, the population growth?

PMC Practice 1
Biology
Man and His Environment
Elimination Tool:

A) Becomes fast

B) Slows down

C) Remains same

D) None of these

53 / 100

Category: Biology Ch 8 Class 12

A man with blood group “A” marries a woman of blood group “B”. Both are heterozygous. What is the off-springs having phenotype “O”

Zero

25%

50%

75%

54 / 100

Category: Biology Ch 5 Class 12

Lateral meristems are present in

All plants

Gymnosperms and dicots

Monocots

In aquatic plants

55 / 100

Category: Biology Ch 3 Class 12

_________ is sometimes given by injection as an emergency treatment in cardiac arrest:

NUMS 2020
Biology
Coordination and Control
Elimination Tool:

A) Acetylcholine

B) Dopamine

C) Serotonin

D) Epinephrine

56 / 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

57 / 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

58 / 100

Category: Biology Ch 11 Class 11

Which of the following light is least absorbed by the plants:

Orange

Red

Blue

Green

59 / 100

Category: Biology

_____ are more common in human males and females.

NUMS Mock 3
Biology
Variation and Genetics

A) X-linked dominant traits

B) X-linked recessive traits

C) Y-linked dominant traits

D) Autosomal linked recessive traits

60 / 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

61 / 100

Category: Biology Ch 11 Class 11

Carbon dioxide joins the photosynthetic pathway at:

NTS 2018
Biology
Bioenergetics
Elimination Tool:

A) PSI

B) PSII

C) Light reaction

D) Dark reaction

62 / 100

Category: Biology Ch 9 Class 12

Chimaeric DNA is also known as

Recombinant DNA

Complementary DNA

Vector

Plasmid

63 / 100

Category: Biology Ch 10 Class 12

The following observations refer to evolution:

Inherited variations which are favored in a particular environment are passed on
There is a struggle for existence
Across time, inherited variations may accumulate causing gradual changes in the organism
Although populations tend to overproduce, they remain more or less constant in numbers from generation to generation
In what sequence should the statement be placed to support the Darwin theory of evolution?

NTS 2015 DUHS and JSMU
Biology
Evolution
Elimination Tool:

A) I, II, III, IV

B) II, I, III, IV

C) III, I, IV, II

E) IV, II, I, III

64 / 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.

65 / 100

Category: Biology Ch 13 Class 11

Oxygen is transported by combining with ……….. in Hb.

NUMS 2015
Biology
Gaseous Exchange
Elimination Tool:

A) Nitrogen

B) Iron

D) Hydrogen

C) Carbon

66 / 100

Category: Biology

Lecithin is formed by combining phosphatidic acid with ______:

NUMS Mock 1
Biology
Biological Molecules

A) Serine

B) Choline

C) Inositol

D) Ethanolamine

67 / 100

Category: Biology

The element in basic structure of proteins which differentiate them from carbohydrates is?

NUMS Mock 1
Biology
Biological Molecules

A) Carbon.

B) Hydrogen.

C) Nitrogen.

D) None of these options is correct.

68 / 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

69 / 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

70 / 100

Category: Biology Ch 13 Class 11

Diaphragm is a sheet of:

NUMS 2019 Cancelled
Biology
Gaseous Exchange
Elimination Tool:

A) Smooth muscles

B) Cardiac muscles

C) Skeletal muscles

D) All of these

71 / 100

Category: Biology

Enzymes work by lowering the ______ of the reactions they catalyse:

NUMS Mock 4
Biology
Enzymes

A) Kinetic energy

B) Activation energy

C) Heat energy

D) Potential energy

72 / 100

Category: Biology Ch 3 Class 12

The correct option about spinal nerves is:

NUMS 2020
Biology
Coordination and Control
Elimination Tool:

A) 33 pairs

B) Mostly mixed nerves

C) Dorsal root contains sensory neurons

D) Ventral root contains motor neurons

E) C and D both

73 / 100

Category: Biology Ch 8 Class 12

In nature, Garden pea is

Self-fertilized

Cross fertilized

Cross pollinated

None of these

74 / 100

Category: Biology Ch 9 Class 12

Transgenic organisms:

PMC 2020
Biology
Biotechnology
Elimination Tool:

A) Have a foreign gene inserted into them

B) Have an important role in the large scale production of medicinal products

C) Are considered beneficial to humans

D) All of the above

75 / 100

Category: Biology Ch 5 Class 11

Vaccine Was discovered by :

Louis Pasteur

Edward Jennar

Ivanowski

Stanely

76 / 100

Category: Biology Ch 11 Class 11

What is the function of Ribulose?

PMC 2020
Biology
Bioenergetics
Elimination Tool:

A) Intermediates in photosynthesis

B) Respiratory fuel

C) Intermediates in cellular respiration

D) Component of DNA and RNA

77 / 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

78 / 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

79 / 100

Category: Biology Ch 2 Class 11

According to the fluid mosaic model of cell membrane, which zone is embedded inside?

PMC 2020
Biology
Biological Molecules
Elimination Tool:

A) Hydrophobic

B) Hydrophilic

C) Globular

D) Filamentous

80 / 100

Category: Biology

Haploid and monoploid numbers of chromosomes of hexaploid wheat are:

NUMS Mock 4
Biology
Chromosomes and DNA

A) 21 and 42

B) 7 and 21

C) 21 and 7

D) 42 and 21

81 / 100

Category: Biology Ch 9 Class 11

Antheridiophore and archegoniophore are found in

Marchantia

Funaria

Both of these

None of these

82 / 100

Category: Biology Ch 12 Class 11

Certain types of whales are also ______ feeder.

Fluid

Macrophagous

Filter

None of these

83 / 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

84 / 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

85 / 100

Category: Biology

Movement of the Hip joint is which type of synovial joints?

NUMS Mock 1
Biology
Support and Movement

A) Gliding joint

B) Ball and socket joint

C) Pivot joints

D) Hinge joint

86 / 100

Category: Biology Ch 10 Class 11

The mammals termed as the connecting link between reptilians and mammals are:

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Marsupials

B) Eutherians

C) Monotremes

D) Metatherians

87 / 100

Category: Biology Ch 7 Class 11

Photosynthesis is absent in which of the following:

PMC 2021 Tested
Biology
Kingdom Protista
Elimination Tool:

A) Bacteria

B) None of these

C) Seaweeds

D) Mushrooms

88 / 100

Category: Biology Ch 14 Class 11

The function of papillary muscles is to:

NUMS 2020
Biology
Transport
Elimination Tool:

A) Move blood from semilunar valve into pulmonary vein

B) Prevent the backward flow of blood from the ventricle

C) Push the blood from right atrium to left atrium

D) Push the blood from left atrium to aorta

89 / 100

Category: Biology Ch 4 Class 11

Anthocyanins are various types of colorful pigments present in the:

NUMS 2014
Biology
Cell Structure and Function
Elimination Tool:

A) Chloroplasts

B) Chromoplasts

C) Leucoplasts

D) Vacuoles

90 / 100

Category: Biology Ch 12 Class 11

Earthworm is an example of ______ feeder

Detritus

Fluid

Macrophageus

Filter

91 / 100

Category: Biology

Q.46 Identify the property which is not related to cardiac muscle:

A. Irregular strips

B. Spontaneous contraction

C. Branched

D. Slow speed of contraction

92 / 100

Category: Biology

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

A Hydrolysis

B. Chemiosmosis

C. Photolysis

D. Photosynthesis

93 / 100

Category: Biology Ch 7 Class 11

Which part of bacteria is most delicate and damage to it can kill the bacteria?

PMC 2021 Tested
Biology
Kingdom Protista
Elimination Tool:

A) Cell wall

B) Slime

C) Capsule

D) Cell membrane

94 / 100

Category: Biology Ch 1 Class 12

The only possible treatment in end stage renal failure is:

NUMS 2018
Biology
Homeostasis
Elimination Tool:

A) Hemodialysis

B) Peritoneal dialysis

C) Lithotripsy

D) Kidney transplantation

95 / 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

96 / 100

Category: Biology

Q.26 Two pea plants are crossed. One plant is homozygous dominant for purple flowers, and the other is homozygous recessive for white lowers. What fraction of the F2 population will have white lowers?

A. 1/4

B. 1/2

C. 1/8

D. 1/16

97 / 100

Category: Biology Ch 4 Class 12

In human females, oocytes are held in the second metaphase until ________.

NUMS 2019 Reconduct
Biology
Reproduction
Elimination Tool:

A) Death

B) Birth

C) Ovulation

D) Fertilization

98 / 100

Category: Biology Ch 4 Class 12

Testes are structures that produce:

NTS 2015 SMBBMC
Biology
Reproduction
Elimination Tool:

A) Spores

B) Sperms

C) Seeds

D) Ova

99 / 100

Category: Biology Ch 5 Class 12

A plant has a growth pattern called

Closed growth

Open growth

In between the two

100 / 100

Category: Biology Ch 7 Class 11

Which of the protozoa has a striking resemblance to collar cells in sponges?

Zooflagellates

Choanflagellates

Trypanosomoa

Trichonymphas

Your score is

The average score is 60%

0%

PLS Boost Bundle