More Classes
5th Class
6th Class
7th Class
8th Class
9th Class
10th Class
11th Class
12th Class
NAT I
NAT II
CSS
IQ
General Knowledge
MDCAT
ECAT
GAT General
GAT Subject
Other Links
Go to Home
Online Tests
MDCAT Biology Online Test MCQs With Answers
Question # 1
Myelin is made up of
Choose an answer
Nucleoprotein
Lipoprotein
Glycolipids
Glycoproteins
Previous
Skip
Next
Question # 2
Which one of the following is site of oxidative Phosphorylation in mitochondria
Choose an answer
Cristae
Outer membrane
Matric
Ribosome
Previous
Skip
Next
Question # 3
Fresh water ecosystem cover the land only:
Choose an answer
2%
3%
4%
1%
Previous
Skip
Next
Question # 4
Darwin proposed a mechanism for evolution, which he termed
Choose an answer
Natural selection
Special reaction
Adaptation
Descent with modification
Previous
Skip
Next
Question # 5
The idea of endosymbiont hypothesis was first proposed by:
Choose an answer
Lynn marguils
Wallace
Karlene Schwartz
Lamarck
Previous
Skip
Next
Question # 6
Over grazing may lead to:
Choose an answer
Tundra
Taiga
Grassland
Desert
Previous
Skip
Next
Question # 7
Mutatuons are inherited only if they occur in the
Choose an answer
Gland cells
Gametes
Muscle cells
Somatic cells
Previous
Skip
Next
Question # 8
The most common animal of phylum Aschelminthes is:
Choose an answer
Enterobuis vermicularis
Ascaris lumbricoides
Ancylostoma duodenale
Rhabditis
Previous
Skip
Next
Question # 9
We are reducing natural 'carbon dioxide's
Choose an answer
Sources
Sinks
Both
None
Previous
Skip
Next
Question # 10
A process in which one organism get benefit from the relationship is known as
Choose an answer
Grazing
Commensalism
Symbiosis
Mutualism
Previous
Skip
Next
Question # 11
Man is
Choose an answer
Primary consumers
Secondary consumers
Tertiary consumers
All of above
Previous
Skip
Next
Question # 12
Each biome consists of a combination of plants and animals in the fully developed
Choose an answer
Climax community
Community
Population
None of above
Previous
Skip
Next
Question # 13
The tundra vegetation supports the animals called:
Choose an answer
lemmings
Marchpolo sheeps
Goats
None of these
Previous
Skip
Next
Question # 14
Both meissner’s and pacinian corpuscles have____ nerve endings
Choose an answer
Spiral
Encapsulated
Free
Deep
Previous
Skip
Next
Question # 15
Climax in zerosere is the establishment fo
Choose an answer
Woody forest
Grasses
Herbs
Shrubs
Previous
Skip
Next
Question # 16
Structural proteins of HIV are
Choose an answer
Encoded by virus genes
Synthesized by host ribosomes
Digested by viral enzymes
All of these
Previous
Skip
Next
Question # 17
The establishment of stable vegetation on an area is termed as
Choose an answer
Plant succession
Animal succession
Succession
All of the above
Previous
Skip
Next
Question # 18
In a DNA duplex , what will be distance in between two consecutive base pairs:
Choose an answer
3.4 Angstrom
34 Angstrom
0.34 Angstrom
340 Angstrom
Previous
Skip
Next
Question # 19
Actual place or location where an organism lives is called us:
Choose an answer
Niche
Terrain
Habitat
Domain
Previous
Skip
Next
Question # 20
Animals feed on green plants and grasses are called
Choose an answer
Grazers
Produces
Consumers
Predators
Previous
Skip
Next
Question # 21
Most unifying characteristics of all types of cells is
Choose an answer
Cell membrane
Nucleus
Ribosomes
S.E.R
Previous
Skip
Next
Question # 22
What is trampling
Choose an answer
Eating grasses to roots
Nipping leaves
Overgrazing
Putting pressure on soil to make it compact
Previous
Skip
Next
Question # 23
In an ecosystem after succession, a new invaders are called
Choose an answer
Pioneers
Predecessors
Climax community
None of these
Previous
Skip
Next
Question # 24
The type of association between two organisms, which brings benefit to both the organisms is called
Choose an answer
Commensalism
Predation
Mutualism
Parasitism
Previous
Skip
Next
Question # 25
Ribozyme is found in
Choose an answer
Mitochondria
Cytoplasm
Lysosomes
Ribosomes
Previous
Skip
Next
Question # 26
Loins are
Choose an answer
Primary consumers
Secondary consumers
Tertiary consumer
All of above
Previous
Skip
Next
Question # 27
Which is incorrect about resting membrane potential
Choose an answer
Na+ ions are ten folds higher outside
2 Na+ move out for 3 K+ move in
K+ ions are twenty folds higher inside
Some k+ ions leak out
Previous
Skip
Next
Question # 28
Resting membrane potential of a neuron is
Choose an answer
50mV
-70mv
-80mV
90mV
Previous
Skip
Next
Question # 29
On an average, there are 50 or more thylakoids piled to form one
Choose an answer
Intergranum
Crista
Granum
F
_1
particle
Previous
Skip
Next
Question # 30
Crystallization of viruses was done by _____ for the first time
Choose an answer
Ivanowsky
Twort
Stanley
Robert Koch
Previous
Skip
Next
Question # 31
The soil of the deciduous forest is:
Choose an answer
Yellow
Grayish brown
Grayish black
Black
Previous
Skip
Next
Question # 32
Endocytosis of an apoptotic body is termed as
Choose an answer
Pinocytosis
Exocytosis
Phagocytosis
Apoptosis
Previous
Skip
Next
Question # 33
Between 80 to 90% of the original energy is lost as heat as a byproduct of
Choose an answer
Photosyntheis
Urine
Respiration
All of the above
Previous
Skip
Next
Question # 34
A mixture of sand and clay in:
Choose an answer
Silt
Kaolin
Humus
Loam
Previous
Skip
Next
Question # 35
Glycine can be converted to alanine by
Choose an answer
Addition of carbon and 2 hydrogens
Removal of carbon and 2 hydrogens
Addition of Methyl group
Removal of hydrogen and 2 carbons
Previous
Skip
Next
Question # 36
A collection of related parts that function as a unit is called:
Choose an answer
Organ
Organism
System
Individual
Previous
Skip
Next
Question # 37
The total amount of energy fixed by plants is ______ productions
Choose an answer
Gross primary
Net primary
Secondary
All of the above
Previous
Skip
Next
Question # 38
Salt water ocean and sea are the largest ecosystem which cover __________ of earth surfaces.
Choose an answer
70%
71%
80%
65%
Previous
Skip
Next
Question # 39
Which enzyme deficiency leads to phenylketonuria
Choose an answer
Phenylalanine oxidase
Phenylalanine hydroxylase
Phenylalanine synthase
Phenylalanine carboxylase
Previous
Skip
Next
Question # 40
Archaeobacteria could tolerate temperatures up to :
Choose an answer
140°C
120°C
95°C
70°C
Previous
Skip
Next
Question # 41
Which element is the most potent source for the depletion of ozone layer
Choose an answer
Chlorine
Fluorine
Carbon
All of them
Previous
Skip
Next
Question # 42
Which can't increase their weight in inorganic medium
Choose an answer
Producer
Consumer
Decomposer
Both b & c
Previous
Skip
Next
Question # 43
The term ecology comes form the ______ words oikos, meaning "The family household"
Choose an answer
Greek
Latin
English
French
Previous
Skip
Next
Question # 44
Dandruff is the example of
Choose an answer
Endoparadite
Ectoparasite
Outer parasite
All of above
Previous
Skip
Next
Question # 45
Which of the following is not true about biotic components
Choose an answer
Producers
Consumers
Decomposers
Atmosphere
Previous
Skip
Next
Question # 46
Causative agent of mysterious brain infection is composed of
Choose an answer
DNA+Protein
RNA+Protein
RNA only
Protein only
Previous
Skip
Next
Question # 47
The succession started on bare area is called as
Choose an answer
Primary succession
Secondary succession
Tertiary succession
Quartnary succession
Previous
Skip
Next
Question # 48
Monoculture is
Choose an answer
One organism
A lab culture
A pure culture
Both b and c
Previous
Skip
Next
Question # 49
About ______% if the total energy from the sun is trapped by the producers in an ecosystem
Choose an answer
0.5
1.0
1.5
2.0
Previous
Skip
Next
Question # 50
The nutrient cycles are also called:
Choose an answer
Biochemical cycles
Geochemical cycles
Biogeochemical cycles
Elemental cycles
Previous
Skip
Next
Question # 51
_____ is a good example of polymorphism
Choose an answer
Hydra
Obelia
Starfish
Euplectella
Previous
Skip
Next
Question # 52
Plant and animals replace the earlier ones in a way of
Choose an answer
Community relay
Succession
Predecessors
All of these
Previous
Skip
Next
Question # 53
Endosymbiont hypothesis was first proposed by
Choose an answer
Lynn Margulis
Malthus
Cuvier
Darwin
Previous
Skip
Next
Question # 54
Patient of AIDS is susceptible to many infections due to
Choose an answer
Severe pneumonia
Swollen lymph nodes
Loss of immune system
All of these
Previous
Skip
Next
Question # 55
Part of brain that is involved in learning
Choose an answer
Cerebrum
Thalamus
Cerebellum
Pons
Previous
Skip
Next
Question # 56
There is an association between two organisms, which brings benefits to both the organisms
Choose an answer
Predation
Symbiosis
Parasitism
None of above
Previous
Skip
Next
Question # 57
Lichen is the example of
Choose an answer
Mutualism
Commenaslim
Parasitism
All of above
Previous
Skip
Next
Question # 58
The animals which feed on grasses are called:
Choose an answer
Grassers
Browsers
Grazers
Grazophytes
Previous
Skip
Next
Question # 59
The cells absent in sponges are
Choose an answer
Chondrocytes
Pinacocytes
Choanocytes
Archeocytes
Previous
Skip
Next
Question # 60
Major cells infected by HIV are
Choose an answer
Monocytes
B lymphocytes
T lymphocytes
RBC
Previous
Skip
Next
Question # 61
When bacteria break down nitrates and release nitrogen back into atmosphere this process is called:
Choose an answer
Nitrification
Denitrification
Ammonification
Deamination
Previous
Skip
Next
Question # 62
In a phospholipid molecule, phosphoric acid is attached to the carbon number_____ of glycerol.
Choose an answer
1
2
3
4
Previous
Skip
Next
Question # 63
Which of the following is not an enzyme of HIV
Choose an answer
Reverse transcriptase
Integerase
Protease
Ligase
Previous
Skip
Next
Question # 64
This is an association between a host and a parasite
Choose an answer
Predation
Anemies
Parasitism
None of above
Previous
Skip
Next
Question # 65
Which one of following structures is formed from mesoderm?
Choose an answer
Intestinal lining
Muscles
Skin
Brain
Previous
Skip
Next
Question # 66
The major unit of ecology is:
Choose an answer
Biosphere
Ecosystem
Community
Population
Previous
Skip
Next
Question # 67
The cartilaginous fishes contain scales ….
Choose an answer
Placoid
Cycloid
Ganoid
Ctenoid
Previous
Skip
Next
Question # 68
Enzyme works to its maximum capacity
Choose an answer
At high temperature
At low temperature
At moderate temperature
At optimum temperature
Previous
Skip
Next
Question # 69
The land will be turned to barren land if there is:
Choose an answer
Little grazing
Moderate grazing
Over grazing
None grazing
Previous
Skip
Next
Question # 70
Succession ends with a diverse and relatively stable:
Choose an answer
Xerosere
Derosere
Pioneers
Climax community
Previous
Skip
Next
Question # 71
The first person who argued from evidence that species were not created in their present form rather they had evolved from ancestral species was
Choose an answer
Aristotle
Lamarck
Darwin
Mendel
Previous
Skip
Next
Question # 72
Overgrazing
Choose an answer
Promotes salinity
Promotes erosion
Promotes grasses
Inhibits dicot competitors
Previous
Skip
Next
Question # 73
The productivity of aquatic ecosystem is basically determined by the:
Choose an answer
Light and nutrients
Light and carbohydrates
Light and proteins
Light and minerals
Previous
Skip
Next
Question # 74
All populations within an ecosystem are known as a:
Choose an answer
Population
Community
Species
Clan
Previous
Skip
Next
Question # 75
Chlorofluorocarbons are
Choose an answer
Organic
Inorganic
Intermediate
Solid
Previous
Skip
Next
Question # 76
The predeter and prey relationship is called as
Choose an answer
Predation
Animes
Parasitism
None of above
Previous
Skip
Next
Question # 77
Tundra ecosystem is a vast treeless region bordering the:
Choose an answer
Pacific ocean
Atlantic ocean
Arctic ocean
Arabian sea
Previous
Skip
Next
Question # 78
Nitrogen makes up 78 percent of the gases in:
Choose an answer
Biosphere
Ecosphere
Lithosphere
Atmosphere
Previous
Skip
Next
Question # 79
All chromosomes other than sex chromosomes are called
Choose an answer
Linked Chromosomes
Autosomes
Autophagosommes
Dictyosomes
Previous
Skip
Next
Question # 80
The essential requirement for life is:
Choose an answer
Minerals
Water
Carbohydrates
Proteins
Previous
Skip
Next
Question # 81
Which of the following things were not collected by Darwin?
Choose an answer
Specimens of diverse faunas and floras of south America
South American fossils
13 types of finches
Turtles
Previous
Skip
Next
Back