Biology Practice Test 1

Created by Ali Durrani

MDCAT Practice Tests

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1 / 100

Category: Biology Ch 11 Class 11

Light reaction takes place on/in

Thylakoid

Storma

Chloroplast

Grana

2 / 100

Category: Biology Ch 14 Class 11

The valve between right atrium and right ventricle is called:

NUMS 2014
Biology
Transport
Elimination Tool:

A) Bicuspid valve

B) Tricuspid valve

C) Pulmonary valve

D) Semi lunar valve

3 / 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

4 / 100

Category: Biology

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

A. T- lymphocytes

B. Plasma cells

C. B- lymphocytes

D. Fibroblasts

5 / 100

Category: Biology Ch 9 Class 12

Passive immunity is used against:

UHS 2015
Biology
Biotechnology
Elimination Tool:

A) Malaria

B) Typhoid

C) Dengue

D) Tetanus

6 / 100

Category: Biology Ch 8 Class 12

Which of the following characters of pea plant is dominant?

Axial flowers

Yellow pods

White flowers

Wrinkled seeds

7 / 100

Category: Biology Ch 11 Class 11

The point at which there is no net exchange of gases between leaves and atmosphere is known as

Neutral point

Compensation point

Parallel point

Competitive point

8 / 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

9 / 100

Category: Biology Ch 10 Class 11

Pinacocytes forms ______.

NUMS 2018
Biology
Kingdom Animalia
Elimination Tool:

A) Pores

B) Ostia

C) Epidermis

D) Spongocoel

10 / 100

Category: Biology Ch 3 Class 12

At the induction of action potential opening of Na+ gate with influx of Na+ is a _________ processes:

Active transport

Passive transport.

Diffusion

none of these.

11 / 100

Category: Biology Ch 7 Class 12

Reverse of prophase is

Interphase

Metaphase

Anaphase

Telophase

12 / 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

13 / 100

Category: Biology Ch 4 Class 11

Which of the following cell organelles involved in the synthesis of cell wall and middle lamella?

PMC 2020
Biology
Cell Structure and Function
Elimination Tool:

A) Endoplasmic reticulum

B) Golgi apparatus

C) Lysosomes

D) Peroxisomes

14 / 100

Category: Biology

Which of the following part of the cell is described as a fluid mosaic?

NUMS Mock 4
Biology
Cell Structure and Function

A) Chloroplast.

B) Vacuole.

C) Cell membrane.

D) Endoplasmic Reticulum.

15 / 100

Category: Biology Ch 8 Class 12

The disease, which is caused by defect in a single gene or pair of genes is referred to as:

NTS 2016 SMBBMC
Biology
Variation and Genetics
Elimination Tool:

A) Unifactorial

B) Multifactorial

C) Down syndrome

D) Turner syndrome

16 / 100

Category: Biology Ch 6 Class 12

Phenotype is:

PMC 2020
Biology
Chromosomes and DNA
Elimination Tool:

A) The genetic component i.e. the genes in an individual for a particular trait

B) Partner of gene pair

C) The form of appearance of a trait

D) The position of a gene on the chromosome

17 / 100

Category: Biology Ch 2 Class 12

Tendon is made up of:

NUMS 2014
Biology
Support and Movement
Elimination Tool:

A) Yellow fibrous connective tissue

B) Modified white fibrous tissue

C) Areolar tissue

D) Adipose tissue

18 / 100

Category: Biology Ch 13 Class 12

Study of human population and things that affect them is

Ecology

Demography

Demology

Environment

19 / 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

20 / 100

Category: Biology Ch 13 Class 12

The productivity of aquatic ecosystem is determined by:

NUMS 2016
Biology
Man and His Environment
Elimination Tool:

A) Water

B) Light and nutrients

C) Light

D) Nutrients

21 / 100

Category: Biology Ch 9 Class 12

Which of the following diseases CANNOT be cured by gene therapy?

NUMS 2019 Reconduct
Biology
Biotechnology
Elimination Tool:

A) SCID

B) Tuberculosis

C) Cystic fibrosis

D) Cancer

22 / 100

Category: Biology Ch 2 Class 11

Among the most abundant biomolecules, _____ is the most abundant one on earth.

NUMS 2016
Chemistry
Biological Molecules
Elimination Tool:

A) Proteins

B) Carbohydrates

C) Lipids

D) Vitamins

23 / 100

Category: Biology Ch 6 Class 12

Phenylketonuria is

NTS 2016 DUHS & JSMU
Biology
Chromosomes and DNA
Elimination Tool:

A) Sex linked dominant trait

B) Sex linked recessive trait

C) Autosomal dominant trait

D) Autosomal recessive trait

24 / 100

Category: Biology Ch 10 Class 11

Flame cells are commonly found in:

NUMS 2014
Biology
Kingdom Animalia
Elimination Tool:

A) Platyhelminthes

B) Annelida

C) Coelenterate

D) All of above

25 / 100

Category: Biology Ch 1 Class 11

Different species of plants and animals living in the same habitat is called :

Population

Community

Biome

26 / 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

27 / 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 1
Biology
Enzymes

A) Feedback inhibitor

B) Non-competitive inhibitor

C) Allosteric modulator

D) Competitive inhibitor

28 / 100

Category: Biology

Q.51 Which of the following is the respiratory surface in human beings?

A. Lungs

B. Alveoli

C. Windpipe

D. alveolar duct

29 / 100

Category: Biology Ch 13 Class 11

As pH of blood decreases, H+ ions increases, which combine the proteins part of hemoglobin, to decrease its ability to bind with:

NUMS 2017
Biology
Gaseous Exchange
Elimination Tool:

A) O2

B) CO2

C) CO

D) H2

30 / 100

Category: Biology

When were bacteriophages discovered by Twort?

NUMS Mock 2
Biology
Bio-diversity | Variety of Life
Variety of Life

A) 1915

B) 1920

C) 1910

D) 1820

31 / 100

Category: Biology Ch 4 Class 11

The process of membrane fusion and the movement of material out of the cell, is called:

NTS 2016 SMBBMC
Biology
Cell Structure and Function
Elimination Tool:

A) Phagocytosis

B) Endocytosis

C) Pinocytosis

D) Exocytosis

32 / 100

Category: Biology Ch 10 Class 11

Platyhelminthes means:

NUMS 2017
Biology
Kingdom Animalia
Elimination Tool:

A) Flatworms

B) Roundworms

C) Segmented worms

D) None of the above

33 / 100

Category: Biology Ch 9 Class 12

A single gene can be amplified by using:

NUMS 2019 Reconduct
Biology
Biotechnology
Elimination Tool:

A) DNA fingerprinting

B) Polymerase Chain Reaction

C) Gel Electrophoresis

D) Recombinant DNA technology

34 / 100

Category: Biology Ch 2 Class 11

Which type of protein structure contains the three dimensional structure?

NTS 2013
Biology
Biological Molecules
Elimination Tool:

A) Primary

B) Secondary

C) Tertiary

D) Quaternary

35 / 100

Category: Biology Ch 6 Class 11

Under the microscope, the bacteria appear a bluish-purple color. Which class of bacteria are on the slide?

PMC Practice 5
Biology
Kingdom Prokaryote
Elimination Tool:

A) Helix

B) Around

C) Rod

D) Rigid helix

36 / 100

Category: Biology Ch 8 Class 11

The fungus which provides a chemotherapeutic agent that is used to inhibit fungal growth is called

NUMS 2015
Biology
Kingdom Fungi
Elimination Tool:

A) Penicillium notatum

B) Aspergillus

C) Penicillium griseofulvum

D) Claviceps purpurea

37 / 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

38 / 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

39 / 100

Category: Biology

Which type of protein structure contains the three dimensional structure?

NUMS Mock 4
Biology
Biological Molecules

A) Primary

B) Secondary

C) Tertiary

D) Quaternary

40 / 100

Category: Biology Ch 3 Class 12

Lymph nodes are not present:

NUMS 2020
Biology
Coordination and Control
Elimination Tool:

A) Neck region

B) Axilla

C) Groin

D) Spleen

41 / 100

Category: Biology Ch 6 Class 11

Which one of the following sets includes the bacterial diseases?

NUMS 2014
Biology
Kingdom Prokaryote
Elimination Tool:

A) Cholera, typhoid, mumps

B) Tetanus, tuberculosis, measles

C) Malaria, mumps, poliomyelitis

D) Diphtheria, leprosy, plague

42 / 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

43 / 100

Category: Biology Ch 9 Class 12

A single stranded nucleotide sequence that will hybridize into a certain piece of DNA is

Primer

Probe

Genome

Both a & b

44 / 100

Category: Biology Ch 8 Class 11

Unicellular fungi which is non-hyphal is

Mushroom

Yeast

Penicillium

Mold

45 / 100

Category: Biology Ch 8 Class 11

Lichen is a symbiotic mutualistic association of fungi with

Autotrophs

Roots of vascular plants

Green algae and cyanobacterium

Leguminous plants

46 / 100

Category: Biology Ch 10 Class 12

A group of interbreeding individuals belonging to a particular species and sharing a common geopraphic area is called

Community

Family

Population

Race

47 / 100

Category: Biology Ch 4 Class 12

Treponema pallidum causes:

NUMS 2016
Biology
Reproduction
Elimination Tool:

A) Syphilis

B) Gonorrhoea

C) AIDS

D) Herpes

48 / 100

Category: Biology Ch 5 Class 11

Diseases in living organisms which are caused by parasites are called:

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

A) Disinfestations

B) Antisepsis

C) Infections

D) Infestations

49 / 100

Category: Biology Ch 11 Class 12

All populations within an ecosystem interconnected to one another are known as

Species

Family

Community

Biomes

50 / 100

Category: Biology Ch 12 Class 11

Useful bacteria at the large intestine of humans produce:

NUMS 2015
Biology
Nutrition
Elimination Tool:

A) Vitamin K

B) Vitamin E

C) Vitamin D

D) Vitamin C

51 / 100

Category: Biology Ch 3 Class 12

Normal resting membrane potential of a neuron is

50 mv

60 mv

70 mv

80 mv

52 / 100

Category: Biology

Mutations can occur in:

NUMS Mock 4
Biology
Chromosomes and DNA

A) DNA

B) Protein

C) RNA

D) A and C

53 / 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

54 / 100

Category: Biology Ch 9 Class 12

Treatment of hereditary disorders by gene manipulations is called:

NUMS 2016
Biology
Biotechnology
Elimination Tool:

A) Biotechnology

B) Genetic engineering

C) Gene therapy

D) None of these

55 / 100

Category: Biology

Two species can avoid competition and better use the environment’s resources by occupying different ____.

NUMS Mock 4
Biology
Evolution

A) Adaptations

B) Polymorphism

C) Niches

D) Specialization

56 / 100

Category: Biology Ch 7 Class 12

During which stage of meiosis do centromeres divide?

NTS 2016 DUHS & JSMU
Biology
Cell Cycle
Elimination Tool:

A) Prophase I

B) Metaphase I

C) Prophase II

D) Metaphase II

57 / 100

Category: Biology Ch 6 Class 12

What will be the approximate length of a DNA strand having 500 nucleotides?

NUMS 2015
Biology
Chromosomes and DNA
Elimination Tool:

HIDE ELIMINATED OPTIONS

A) 100 nm

B) 130 nm

C) 170 nm

D) 150 nm

58 / 100

Category: Biology

Q.64 Which of the following conditions is not required to be true for a population in Hardy-Veinberg equilibrium?

A. Random mutation

B. Large population

C. No natural selection

D. Random mating

59 / 100

Category: Biology Ch 4 Class 11

Which of the statement about cell membrane is not true?

It contains protein molecules embedded in lipid bilayer

It is a differentially permeable membrane.

It contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles.

It may get infolded to engulf solid or liquid material.

60 / 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)

61 / 100

Category: Biology Ch 9 Class 12

Vaccination can be done against:

NUMS 2015
Biology
Biotechnology
Elimination Tool:

A) Bacterial diseases only

B) Viral diseases only

C) Both Viral and Bacterial

D) All type of disease-causing organisms

62 / 100

Category: Biology Ch 7 Class 12

In plants mitotic apparatus consists of

Centriole

Centriole and asters

Centrioles, asters and spindles

Spindles only

63 / 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

64 / 100

Category: Biology Ch 2 Class 11

Mono-saccharides have a general formula represented by:

PMC 2020
Biology
Biological Molecules
Elimination Tool:

A) (CH2O)n

B) C(H2O)n

C) C2(H2O)n

D) C2(H2O)n

65 / 100

Category: Biology

It is the smallest eukaryote:

NUMS Mock 2
Biology
Kingdom Protista

A) Virus

B) Bacteria

C) Plasmodium

D) Sponge

66 / 100

Category: Biology Ch 2 Class 12

Growth movement caused in response to gravitational stimulus is called:

NTS 2011
Biology
Support and Movement
Elimination Tool:

A) Nutation

B) Geotropism

C) Nastic movement

D) Tropic movement

67 / 100

Category: Biology

Q.23 Reflex action is type of

A. Voluntary action

B. Involuntary action

C. Saltatory conduction

D. None of these

68 / 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

69 / 100

Category: Biology Ch 14 Class 11

All of the following protect the body against the entrance of germs except:

NTS 2017
Biology
Transport
Elimination Tool:

A) Tears

B) Mucous membranes

C) Ciliated cells

E) Red blood cells,

70 / 100

Category: Biology Ch 2 Class 11

Peptide bonds are formed between:

NUMS 2014
Biology
Biological Molecules
Elimination Tool:

A) Hydrogen groups of adjacent amino acids

B) Non-functional groups of the amino acids

C) Carboxyl groups and amino groups

D) Functional groups and hydrogen groups of adjacent amino acids

71 / 100

Category: Biology Ch 6 Class 12

DNA contains

Purines (A and G) pyrimidines (U and (c)

Purines (T and (c) pyrimidines (A and G)

Purines (A and (c) pyrimidines (U and G)

Purines (A and G) pyrimidines (T and (c)

72 / 100

Category: Biology Ch 3 Class 11

Most enzymes have an optimum temperature of around:

PMC 2020
Biology
Enzymes
Elimination Tool:

A) 30 C

B) 40 C

C) 50 C

D) 20 C

73 / 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

74 / 100

Category: Biology Ch 5 Class 11

Closely related species are grouped together into ______ .

NTS 2012
Biology
Bio-diversity | Variety of Life
Elimination Tool:

A) families

B) orders

C) phyla

E) genus

75 / 100

Category: Biology Ch 6 Class 11

Rod-shaped bacteria are known as:

NUMS 2017
Biology
Kingdom Prokaryote
Elimination Tool:

A) Cocci

B) Bacilli

C) Spirilla

D) None of these

76 / 100

Category: Biology Ch 12 Class 11

In fatty liver the fat contents are:

NUMS 2014
Biology
Nutrition
Elimination Tool:

A) 1 to 2%

B) 4 to 5 %

C) 30 to 40%

D) 10 to 15%

77 / 100

Category: Biology Ch 6 Class 11

The bacteria can cope in unfavorable condition by producing:

NUMS 2017
Biology
Kingdom Prokaryote
Elimination Tool:

A) Mesosomes

B) Zygospores

C) Endospores

D) Hyphae

78 / 100

Category: Biology Ch 13 Class 12

Process ensuring the survival of species over long periods of time, even though individual members of the species die.

UHS 2018
Biology
Man and His Environment
Elimination Tool:

A) Reproduction

B) Adaptability

C) Mitosis

D) Respiration

79 / 100

Category: Biology Ch 5 Class 12

The process of aging:

NUMS 2015
Biology
Growth and Development
Elimination Tool:

A) Can be slowed down by adequate sleep

B) Can be slowed down by regular meals

C) Cannot be slowed down in any way

D) can be slowed by adequate sleep and regular meal

80 / 100

Category: Biology Ch 6 Class 11

The shape of Cocci bacteria is:

NUMS 2017
Biology
Kingdom Prokaryote
Elimination Tool:

A) Spherical

B) Spring

C) Rod

D) Screw

81 / 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

82 / 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

83 / 100

Category: Biology Ch 5 Class 11

Encircle the miss – match:

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

A) Colds…Rhinovirus

B) Yellow fever … Bacteria

C) Encephalitis … Virus

D) Minus strand RNA virus … Paramyxovirus

84 / 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

85 / 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

86 / 100

Category: Biology Ch 1 Class 12

Higher turgor pressure in a plant cell is maintained by:

Large number of vacoules in a plant cell.

Higher ionic concentration inside vacuoles resulting from active pumping of ions at their tonoplastic membrane

Higher osmotic pressure of the cell vacuole

both b and c

87 / 100

Category: Biology Ch 5 Class 11

The genome of viruses is composed of

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

A) DNA

B) RNA

C) Protien

D) Both A and B

88 / 100

Category: Biology Ch 9 Class 12

Which of the following is NOT true for genes used in recombinant DNA technology?

NUMS 2019 Reconduct
Biology
Biotechnology
Elimination Tool:

A) It can isolated from chromosome

B) It can be synthesized chemically

C) It can be made from protein

D) It can be made from mRNA

89 / 100

Category: Biology Ch 13 Class 11

Booklungs serve the function of respiration in:

NTS 2014
Biology
Gaseous Exchange
Elimination Tool:

A) Scorpion

B) Earthworm

C) Frog

D) Cockroaches

90 / 100

Category: Biology

Q.29 Fluid secreted by Sertoli cells provides sperms with which of the following ?

A. Liquid medium

B. Protection

C. Nourishment

D. All of these

91 / 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

92 / 100

Category: Biology Ch 12 Class 11

Digestive system in vertebrates is formed by which germ layer?

NUMS 2014
Biology
Nutrition
Elimination Tool:

A) Ectoderm

B) Endoderm

C) Mesoderm

D) None of these

93 / 100

Category: Biology Ch 11 Class 12

Major regional ecological community of plants and animals forms

Biosphere

Biomass

Biomes

Bioecosystem

94 / 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

95 / 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.

96 / 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

97 / 100

Category: Biology Ch 11 Class 11

In paper chromatography xanthophyll will give ______ color:

NTS 2010
Biology
Bioenergetics
Elimination Tool:

A) Orange

B) Grey

C) Yellow

D) Blue-Green

98 / 100

Category: Biology

Q.17 Final acceptor of electrons in respiratory chain is?

A. NADH

B. Cytochrome a3

C. Water

D. Oxygen

99 / 100

Category: Biology Ch 3 Class 12

The only promoter of leaf senescence in the following plant hormones is:

Gibberellins

Cytokinins

Auxins

Abscisic Acid

100 / 100

Category: Biology Ch 10 Class 11

In some cases the blastomere can produce complete embryo the cleavage will be

Spiral and determinate

Radial and indeterminate

Spiral and indeterminate

Radial and determinate

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3 responses to “Biology Practice Test 1”