Biology Practice Test 1

Created by Ali Durrani

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1 / 100

Category: Biology Ch 6 Class 12

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

NTS 2017
Biology
Chromosomes and DNA
Elimination Tool:

A) TACGGATCCTG

B) UAGCGAUCCUG

C) AUGCCUAGGAC

D) UACCGAUCCUG

2 / 100

Category: Biology Ch 10 Class 12

If allele frequency for a dominant allele is 0.4. What will be the number of heterogeneous individuals if the population is of 100 individuals with diploid traits.

NUMS 2015
Biology
Evolution
Elimination Tool:

A) 36

B) 48

C) 52

D) 74

3 / 100

Category: Biology Ch 10 Class 12

During aristotle time, it was thought that

PMC Sample 3
Biology
Evolution
Elimination Tool:

A) oranisms ranged from simple to complex

B) one type of organisim give rise to another type of organism

D) all living things specially created by nature

C) both a & b

4 / 100

Category: Biology Ch 13 Class 12

Which of the following statements is true about Savannah?

NTS 2015 DUHS and JSMU
Biology
Man and His Environment
Elimination Tool:

A) Dry season is very long and the temperature ranges more than 18 C throughout the year

B) Its plants do not shed off their leaves

C) The subsoil is permanently frozen

D) Rainfall is up to 200 cm per year

5 / 100

Category: Biology Ch 6 Class 12

The true E.Coli replicating enzyme is

DNA polymerase I

DNA polymerase II

DNA polymerase III

All of these

6 / 100

Category: Biology Ch 10 Class 11

Of the following which one is non-cellular in most cases in animals?

Mesenchyme

Sclerenchyma

Chlorenchyma

Mesoderm

7 / 100

Category: Biology Ch 3 Class 11

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:

NTS 2013
Biology
Enzymes
Elimination Tool:

A) Feedback inhibitor

B) Non-competitive inhibitor

C) Allosteric modulator

D) Competitive inhibitor

8 / 100

Category: Biology

Q.52 The plasma pool of antibodies is synthesized from:

A. T- lymphocytes

B. Plasma cells

C. B- lymphocytes

D. Fibroblasts

9 / 100

Category: Biology Ch 7 Class 11

Which of the following statement is incorrect about algae?

Their zygote unlike plants is protected by parental tissue.

Their classification is based on pigment composition.

Most of them have different morphological forms in-different stages of their life cycle.

Almost all of them are aquatic.

10 / 100

Category: Biology Ch 2 Class 11

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

NUMS 2017
Biology
Biological Molecules
Elimination Tool:

A) Purine

B) Pyrimidine

C) H3PO4

D) HNO3

11 / 100

Category: Biology Ch 11 Class 11

The end product of glycolysis in anaerobic respiration is:

PMC 2020
Biology
Bioenergetics
Elimination Tool:

A) Ethanol and Carbon dioxide

B) Lactate

C) Pyruvate

D) Both A and B

12 / 100

Category: Biology Ch 1 Class 12

High level of _____ and _____ in the blood and the contributing factors in the formation of kidney stones.

NUMS 2018
Biology
Homeostasis
Elimination Tool:

A) Calcium, oxalate

B) Calcium, magnesium

C) Calcium, sodium

D) Sodium, sulphate

13 / 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

14 / 100

Category: Biology Ch 6 Class 11

Cyanobacteria help in nitrogen fixation because they have:

PMC 2021 Tested
Biology
Kingdom Prokaryote
Elimination Tool:

A) Sodium channels

B) Heterocysts

C) Harmogonia

D) Nitrogenase

15 / 100

Category: Biology Ch 11 Class 11

Its membranes are the sites where sunlight energy is trapped and where glucose is formed.

Which organelle is this?

NUMS 2014
Biology
Bioenergetics
Elimination Tool:

A) Chloroplast

B) Leucoplast

C) Chromoplast

D) Cytosol

16 / 100

Category: Biology Ch 13 Class 12

Endangered species are

Dangerous for the life of humans

Reduced in number

Already extinct

All of these

17 / 100

Category: Biology Ch 5 Class 11

The shape of the tobacco mosaic virus is:

NUMS 2016
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Spring shape

B) Rod shape

C) Comma shape

D) Spherical shape

18 / 100

Category: Biology Ch 5 Class 12

The major sign and symptoms of microcephaly is:

NTS 2010
Biology
Growth and Development
Elimination Tool:

A) Sexual defects

B) Excessive number of toes

C) Mental retardation

D) Small skull in proportion to the normal body size

19 / 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

20 / 100

Category: Biology Ch 9 Class 11

Antheridia and archegonia are _____ organs in bryophytes.

NTS 2015 DUHS and JSMU
Biology
Kingdom Plantae
Elimination Tool:

A) Reproductive

B) digestive

C) respiratory

D) none of the above

21 / 100

Category: Biology Ch 8 Class 11

How many species of fungi are known till now

10000

100000

10000000

1000

22 / 100

Category: Biology Ch 9 Class 12

A weed engineered to produce a biodegradable plastic in cell granules is

. Mouse-cat cress

Mouse weed

Mouse-eared cress

None of these

23 / 100

Category: Biology Ch 12 Class 11

Midgut in cockroach is a short narrow tube called

Hepatic caeca

Gizzard

Stomach

Rectum

24 / 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

25 / 100

Category: Biology Ch 2 Class 11

Which chemical component has the same % in bacterial as well as the mammalian cell?

Water

Carbohydrate

Proteins

Lipids

26 / 100

Category: Biology

Which of the following photosystems is involved in cyclic photophosphorylation?

NUMS Mock 2
Biology
Bioenergetics

A) PS II

B) PS I

C) PS I and PS II

D) PS III

27 / 100

Category: Biology Ch 13 Class 12

Total area of the world under cultivation is

5%

11%

21%

31%

28 / 100

Category: Biology Ch 3 Class 11

Which of the following statements about enzymes is false?

PMC Sample 1
Biology
Enzymes
Elimination Tool:

A) The Keq of a reaction remains unchanged in the presence of an enzyme

B) Enzymes speed up the rate of reaction in DNA synthesis

C) Harsh, acidic conditions can completely denature an enzyme

D) An enzyme is completely converted to product during metabolism

29 / 100

Category: Biology Ch 13 Class 11

Parabronchi are open at ______ end/s

Single

Both

Do not have opening

None of these

30 / 100

Category: Biology Ch 3 Class 11

Which of the following statements is incorrect?

PMC Sample 1
Biology
Enzymes
Elimination Tool:

A) The competitive inhibitor affects the rate of breakdown of the enzyme-substrate complex.

B) The presence of the competitive inhibitor decreases the Km of the enzyme for the substrate.

C) A competitive inhibitor reacts reversibly with the enzyme to form an enzyme-inhibitor complex.

D) In competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.

31 / 100

Category: Biology Ch 3 Class 11

A/An _______ is mostly a non-protein chemical compound that is required for the protein’s biological activity.

NTS 2019
Biology
Enzymes
Elimination Tool:

A) Active site

B) Substrate

C) Cofactor

D) Enzyme

32 / 100

Category: Biology Ch 13 Class 11

Vocal cords are stretched across

Larynx

Pharynx

Golttis

None of these

33 / 100

Category: Biology Ch 8 Class 11

In rhizopus, zygote forms temporary, dormant, thick-walled resistant structure called:

UHS 2015
Biology
Kingdom Fungi
Elimination Tool:

A) Zygospore

B) Spore

D) Hydra

C) Sporangia

34 / 100

Category: Biology

Q.15 Urethra and vagina have openings to the exterior:

A. common

B. independent

C. Both A and B

D. None of these

35 / 100

Category: Biology Ch 5 Class 12

Higher plants grow through

Growing points

Whole plant body is capable of growing

Only roots grow

None of these

36 / 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

37 / 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

38 / 100

Category: Biology Ch 5 Class 11

Virus is a _____ entity among living and non-living.

PMC Sample 2
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) Balanced

B) Transitional

C) Threshold

D) None of these options is correct

39 / 100

Category: Biology Ch 7 Class 11

Which of the following is TRUE about Amoebae?

PMC 2020
Biology
Kingdom Protista
Elimination Tool:

A) They have flagella

B) They are multicellular

C) They do not cause any disease in humans

D) They move by forming specialized cytoplasmic projections called pseudopodia

40 / 100

Category: Biology Ch 4 Class 11

Whone is not the function of endoplasmic reticulum?

Nerve impulse conduction

Transport of material

Mechanical support

Synthesis of conjugated molecules

41 / 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

42 / 100

Category: Biology Ch 11 Class 11

The oxidation of PGAL during glycolysis yields ____ molecules.

NUMS 2019 Reconduct
Biology
Bioenergetics
Elimination Tool:

A) ATP

B) FAD

C) FADH

D) ADP

43 / 100

Category: Biology Ch 4 Class 12

Which one is not a day neutral plant?

Cucumber

Maize

Cotton

Tobacco

44 / 100

Category: Biology

Q37 The muscle contraction depends on:

A. Nerve impulse

B. Energy

C. Calcium

D. All of these

45 / 100

Category: Biology Ch 1 Class 11

The concept that various organisms dominated this planet during various geological time period and thus placing organisms in a time squence came from the studies by

Environmental biologist

Paleontologist

Marine biologist

Social biologist

46 / 100

Category: Biology Ch 3 Class 12

Thyroid gland requires high amount of:

NUMS 2016
Biology
Coordination and Control
Elimination Tool:

A) Phosphate

B) Calcium

C) Iodine

D) Sodium

47 / 100

Category: Biology Ch 2 Class 11

Antibodies are

NUMS 2019 Cancelled
Biology
Biological Molecules
Elimination Tool:

A) Primary proteins

B) Secondary proteins

C) Tertiary proteins

D) Quaternary proteins

48 / 100

Category: Biology Ch 9 Class 11

The simplest of all bryophytes are

Thallophytes

Embryophytes

Mosses

Liverworts

49 / 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

50 / 100

Category: Biology Ch 1 Class 12

The water content of mammalian blood is regulated by antidiuretic hormone(ADH). In which part of the nephron does regulation occur ?

NTS 2015 SMBBMC
Biology
Homeostasis
Elimination Tool:

A) The ascending limb of the loop of gentle

B) The collecting duct

C) The descending limb of the loop of gentle

D) The proximal convoluted tubule

51 / 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

52 / 100

Category: Biology

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

A. Vector

B. Capsid

C. Plasmid

D. Genome

53 / 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

54 / 100

Category: Biology Ch 6 Class 11

The word Archaeobacteria (a division of bacteria) derived from Greek means

True bacteria

False bacteria

Recent bacteria

Ancient bacteria

55 / 100

Category: Biology

Which organ(s) in the male reproductive system produce gametes?

NUMS Mock 4
Biology
Reproduction

A) Vas deferens

B) Malpighian tubule system

C) Seminiferous tubules

D) Ejaculatory duct

56 / 100

Category: Biology

Q.58 Which of the following is incorrect for ascent of sap?

A. water potential

B. Cohesion tension

C. root pressure

D. imbibition

57 / 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

58 / 100

Category: Biology

Q.66 Which type of sensory structures carrying the touch sensations are present in papillae extending into ridges of the finger tips?

A. Hair end organs

B. Pacinian corpuscles

C. Meissner's Corpuscles

D. All of these

59 / 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

60 / 100

Category: Biology Ch 5 Class 12

A plant has a growth pattern called

Closed growth

Open growth

In between the two

61 / 100

Category: Biology Ch 6 Class 12

Which statement correctly describes the transcription of DNA?

PMC 2020
Biology
Chromosomes and DNA
Elimination Tool:

A) It produces amino acids

B) It produces messenger RNA

C) It results in increased DNA synthesis

D) It is a semi conservative process

62 / 100

Category: Biology Ch 2 Class 11

The helical structure of a protein is kept by the formation of hydrogen bond between amino acid molecules which are:

NUMS 2015
Biology
Biological Molecules
Elimination Tool:

A) Adjacent to each other

B) In successive spiral turns

C) Between two different polypeptide chains

D) None of the given options

63 / 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

64 / 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

65 / 100

Category: Biology Ch 13 Class 12

Greenhouse gases are those that:

NUMS 2015
Biology
Man and His Environment
Elimination Tool:

A) Prevent entry of ultraviolet rays

B) Prevent rainfall

C) Prevent heat to escape

D) All given options are correct

66 / 100

Category: Biology Ch 3 Class 11

The active site of an enzyme:

Never changes

Forms no chemical bond with substrate

Determined by structure and the specificity of the enzyme.

They are non specific in their action.

67 / 100

Category: Biology Ch 13 Class 11

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

NUMS 2015
Biology
Gaseous Exchange
Elimination Tool:

A) Histoplasmosis

B) Tuberculosis

C) Cystic fibrosis

D) None of the given options

68 / 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

69 / 100

Category: Biology

Q.17 Teichoic acids are the characters of:

A. Gram Positive bacteria

B. Mycoplasma

C. Gram Negative bacteria

D. Archaeobacteria

70 / 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

71 / 100

Category: Biology

Q.19 Darwins theory mainly focuses o

A. Origin of life

B. How Orgais extinct

C. How new Species arise

D How organism form

72 / 100

Category: Biology Ch 3 Class 12

Which of the following is not secreted by thyroid gland?

NTS 2015 SMBBMC
Biology
Coordination and Control
Elimination Tool:

A) Thyroxin

B) Triiodothyronine

C) Calcitonin

D) Glucagon

73 / 100

Category: Biology Ch 5 Class 12

Tails can be regenerated in:

NUMS 2015
Biology
Growth and Development
Elimination Tool:

A) The larvae of amphibians

B) Lizards

C) Both lizards and the larvae of amphibians

D) None of the given options

74 / 100

Category: Biology

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

A.. Entomology

B. Bacteriology

Virology

D. Epidemiology

75 / 100

Category: Biology Ch 1 Class 12

Which of the following fish drink large amount of sea water and excrete concentrated urine resulting in maximum salt excretion and minimal water loss?

Hagfish

Fresh water fishes

Bony fishes

None of these

76 / 100

Category: Biology Ch 11 Class 11

Chlorophyll molecule resemble the haem group of hemoglobin, the main difference between these two molecule is that chlorophyll has ____ ion.

NUMS 2019 Reconduct
Biology
Bioenergetics
Elimination Tool:

A) Fe2+

B) Mg2+

C) Mn2+

D) Ca2+

77 / 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

78 / 100

Category: Biology Ch 5 Class 12

Cells elongate by

Mitosis

Uptake of water

Stretching

Formation of cell wall

79 / 100

Category: Biology Ch 8 Class 11

The most common example of members of the kingdom fungi is/are:

NUMS 2015
Biology
Kingdom Fungi
Elimination Tool:

A) Star fish

B) Mushrooms

C) Algae

D) Human

80 / 100

Category: Biology Ch 3 Class 11

The optimum pH for the enzyme arginase is which of the following?

PMC Sample 2
Biology
Enzymes
Elimination Tool:

A) 9.0

B) 9.3

C) 9.7

D) 10

81 / 100

Category: Biology

The photosynthetic pigments of plants are arranged as clusters in thylakoid membranes. The reaction centers of these clusters consist of _____ molecules.

NUMS Mock 3
Biology
Bioenergetics

A) Chlorophyll

B) ATP

C) Carotenoids

D) Glucose

82 / 100

Category: Biology Ch 10 Class 12

According to the theory of natural selection, organisms produce:

UHS 2019
Biology
Evolution
Elimination Tool:

A) Offspring according to the resources available

B) Offspring to create resources

C) To create resources

D) More offspring than supported

83 / 100

Category: Biology Ch 1 Class 12

________ are animals that do not adjust their internal osmolality and are isotonic with their environment.

NUMS 2019 Cancelled
Biology
Homeostasis
Elimination Tool:

A) Osmoconformers

B) Osmoregulators

C) Thermoregulators

D) Thermoconformers

84 / 100

Category: Biology Ch 6 Class 12

A typical human chromosome contains _________ nucleotides in its DNA

240 million

140 million

150 million

160 million

85 / 100

Category: Biology Ch 3 Class 11

Lock and Key Model for enzyme action propose by Emil Fischer suggests that:

PMC 2020
Biology
Enzymes
Elimination Tool:

A) Enzymes are unbiased for the substrate

B) Enzymes can modify their active sites

C) Enzymes are restricted to one reaction type

D) An enzyme can catalyze variety of reactions

86 / 100

Category: Biology Ch 5 Class 12

In multicellular plants cell division occur by

Binary fission

Conjugation

Meiosis

Mitosis

87 / 100

Category: Biology Ch 5 Class 12

Thyroxine deficiency in adults’ results in a condition called:

UHS 2015
Biology
Growth and Development
Elimination Tool:

A) Cretinism

B) Hypothyroidism

C) Thyrotoximia

D) Myxoedema

88 / 100

Category: Biology Ch 6 Class 11

Vibrio cholera is an example of ______ type of bacteria.

NUMS 2017
Biology
Kingdom Prokaryote
Elimination Tool:

A) Cocci

B) Bacilli

C) Spirilla

D) Commas

89 / 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

90 / 100

Category: Biology

In genetics, the term locus refers to the ______ of the gene on the chromosome.

NUMS Mock 4
Biology
Chromosomes and DNA

A) Position

B) Frequency

D) Inversion

C) Copy

91 / 100

Category: Biology Ch 7 Class 11

Which of the following results from conjugation in paramecium?

PMC Practice 3
Biology
Kingdom Protista
Elimination Tool:

A) Cell death

B) Cell division

C) Budding

D) Recombination

92 / 100

Category: Biology Ch 2 Class 12

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

PMC 2020
Biology
Support and Movement
Elimination Tool:

A) Smooth muscles

B) Cardiac muscles

C) Skeletal muscles

D) Glandular muscles

93 / 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

94 / 100

Category: Biology Ch 6 Class 11

Purple non-sulphur bacteria is an example of which of the following?

PMC Practice 2
Biology
Kingdom Prokaryote
Elimination Tool:

A) Heterotrophic bacteria

B) Saprotrophic bacteria

C) Chemosynthetic bacteria

D) Photosynthetic bacteria

95 / 100

Category: Biology Ch 10 Class 12

The actual remains or traces of organisms that lived in ancident geological times

Vestigial remains

Fossils

Fuel

None of these

96 / 100

Category: Biology Ch 4 Class 12

In biennials and perennials, low temperature stimulus is not received by

Shoot apex of mature stem

Embryo of the seed

Leaves of the plants

None of the above

97 / 100

Category: Biology Ch 14 Class 11

In human heart, the left atrium receives:

PMC 2020
Biology
Transport
Elimination Tool:

A) The superior vena cava

B) The inferior vena cava

C) The coronary sinus

D) The four pulmonary veins

98 / 100

Category: Biology

Q.40 Which statement is incorrect:

A. Syphilis is caused by Treponema pallidum

B. Genital herpes produces genital soreness and ulcers

C. Syphilis affects bones, eyes and CNS

D. Gonorrhea is a viral infection

99 / 100

Category: Biology Ch 8 Class 11

Tetracycline and penicillins are:

NUMS 2018
Biology
Kingdom Fungi
Elimination Tool:

A) Disinfectants

B) Antibiotics

C) Antiseptics

D) Antigens

100 / 100

Category: Biology Ch 13 Class 12

Hydroelectricity is generated by using ______ of falling water.

Potential energy

Gravitational energy

Kinetic energy

. All of these

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3 responses to “Biology Practice Test 1”