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MDCAT Biology Online Test MCQs With Answers
Question # 1
The simplest mono saccharide containing keto group is:
Choose an answer
Glyceraldehyde
Glucose
Dihydroxyacetone
Ribose
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Question # 2
Parasites that live inside the body of the host:
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Endoparasites
Ectoparasites
Mesoparasites
Both a & c
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Question # 3
Chloroplasts and mitochondria differ from one another because
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Both are membranous organelles
Both are non-membranous organelles
Both are not present in all cells
Both do not contain proteins
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Question # 4
Crustose refers to:
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Aquatic lifeless structure
Aquatic lively structure
Land lively structure
Land lifeless structure
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Question # 5
Tick the biotic (intra-specific) factors:
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Wave action, humidity, light
Colonization,aggregation,parental care
Neutralism,mutualism,predation
Mineral elements, mutualism,parasitism
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Question # 6
Chemical nature of spikes present on HIV
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Protein
Carbohydrate
Glycolipid
Glycoprotein
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Question # 7
The compound formed by the combination of a base and a pentose sugar is called:
Choose an answer
Nucleoside
Nucleic acid
Nucleotide
Nuclein
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Question # 8
The term enzyme was coined from a Greek word which means
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In yeast
In grapes
In apple
In bacteria
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Question # 9
Which type of hepatitis leads to chronic liver disease?
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Hepatitis D
Hepatitis A
Hepatitis B
Hepatitis C
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Question # 10
Nucleus is visible when the cell is in ____ stage
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Non-dividing
Dividing
active
Both a and b
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Question # 11
Primary succession that starts in a pond is called:
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Hydrosere
Derosere
Xerosere
Aquasure
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Question # 12
Which of the following statement is wrong?
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Fungi have mitochondria
Mitochondria have DNA and ribosomes
Mitochondrial ribosomes resemble more to eukaryotic ribosomes
Mitochondria are self-replicating organelles
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Question # 13
What happens when both alleles of a gene pair independently express in a heterozygote?
Choose an answer
dominance
incomplete dominance
over dominance
codominance
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Question # 14
The animal that is caught and eaten away is called
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Victim
Prey
Predators
Host
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Question # 15
The nutrients in aquatic ecosystem tends to be concentrated near the
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Bottom
Surface
Center of total depth
10 feet below the surface
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Question # 16
All populations within an ecosystem are known as a:
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Population
Community
Species
Clan
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Question # 17
Viruses reproduce through a process
Choose an answer
Binary fission
Replication
Both a and b
Transformation
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Question # 18
In life cycle of bacteriophage, ______ occurs followed by_______.
Choose an answer
Assembly. Penetration
Multiplication, landing
Tail contractio, Penetration
Penetration, Assembly
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Question # 19
______ is a change in the community structure of an ecosystem over a period of time
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Succession
Primary succession
Secondary succession
None of above
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Question # 20
The total energy from the sun is trapped by the producers in an ecosystem is about:
Choose an answer
20%
10%
5%
1%
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Question # 21
In each case succession begins with few hard invaders called:
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Producers
Consumers
Pioneers
Beginners
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Question # 22
Digestive vacuoles are also called as
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Primary Lysosomes
Secondary Lysosomes
Phagocytic Vacuoles
Pinocytic Vacuoles
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Question # 23
Osteoporosis is caused by lack of
Choose an answer
ADH
Melanin
Estrogen
STH
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Question # 24
Viruses are not resistant to
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Interferons
Penicillin
Streptomycin
Any antibiotic
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Question # 25
The relationship of a single population towards its environment is called
Choose an answer
Ecology
Synecology
Autoecology
All of foregoing
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Question # 26
Lamarck was incharge of invertebrate collection at Natural History Museum is
Choose an answer
Berlin
Paris
California
Brun
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Question # 27
Succession starting in pond is called
Choose an answer
Hydrosere
Xerosere
Pioneers
None of these
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Question # 28
About ______% of solar energy is used to evaporate water, heat up soil and then lost to the outer space
Choose an answer
95
97
98
99
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Question # 29
Which of these stages appears as a pioneer during succession on barren land?
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Foliage lichens
Mosses
Crustose lichens
Fruiticose lichens
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Question # 30
Which one of the following enzymes have slightly acidic pH as optimum pH?
Choose an answer
Sucrase
Enterokinase
Pepsin
Catalase
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Question # 31
Eukaryotes are thought to hve evolved firstly about:
Choose an answer
1.3 billion year ago
1.5 billion year ago
1.7 billion year ago
1.2 billion year ago
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Question # 32
When succession starts on dry soil or rocks it is called:
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Hydrosere
Derosere
Xerosere
lithosere
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Question # 33
An exchange of segments between non-sister chromatids of homologous chromosomes during meiosis is termed as :
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Crossing over
Hopping
Taking over
Segregation
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Question # 34
It is not a germ layer
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Ectoderm
Endoderm
Blastoderm
Mesoderm
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Question # 35
Ribozyme is found in
Choose an answer
Mitochondria
Cytoplasm
Lysosomes
Ribosomes
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Question # 36
In a phospholipid molecule, phosphoric acid is attached to the carbon number_____ of glycerol.
Choose an answer
1
2
3
4
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Question # 37
Root Nodules are the example of
Choose an answer
Predation
Symbiosis
Parasitism
None of above
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Question # 38
According to Darwin descent with modification means
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Same ancestor
Same characters
Different ancestors
Different characters
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Question # 39
This is a ------------------- relationship between algae and fungi
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Symbiotic
Mutualistic
Parasitic
Mycorrhizal
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Question # 40
The green photosynthetic plants, which capture and bring light energy into the ecosystem are:
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Decomposers
Consumers
Producers
Scanvengers
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Question # 41
Over-grazing may lead to:
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Desert
Tundra
Taiga
Grassland
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Question # 42
Soil nitrogen resources are also strengthened by the addition of ______ by the man himself
Choose an answer
Nitrogen fertilizers
Nitrogen
Fertilizers
None of above
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Question # 43
What is done to monkeys by HIV
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Multiplication and disease
Infection and multiplication
Infection and disease
None
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Question # 44
Ventral root of the spinal nerve contains
Choose an answer
Sensory nerve fibres
Motor nerve fibres
Mixed nerve fibres
All
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Question # 45
Substances cross the cell membrane more easily when they are
Choose an answer
water soluble
protein soluble
alcohol soluble
lipid soluble
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Question # 46
Provirus is
Choose an answer
Genome of bacteriophage
Genome of HIV uncoiled in Host cell
Genome of HIV incorporated in Host genome
Genome of a host
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Question # 47
An association between two organisms, which brings benefit to both the organisms is called:
Choose an answer
Parasitism
Commensalisms
Predation
Symbiosis
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Question # 48
Tape worm is the example of
Choose an answer
Endoparasite
Ectoparasite
Outer parasite
All of above
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Question # 49
Forest ecosystem is subdivided into ____ type of forests.
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Two
Four
Five
Three
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Question # 50
Plants growing in xeric (dry) condition are called:
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Hydrophytes
Xerophytes
Mesophytes
Derophytes
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Question # 51
The combination of many food chains is termed as
Choose an answer
Food chain
Food web
Trophic level
None of above
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Question # 52
Which of the following sugar does not form a ring structure in a solution
Choose an answer
Glyceraldehyde
Ribose
Glucose
Fructose
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Question # 53
Each biome consists of a combination of plants and animals in the fully developed
Choose an answer
Climax community
Community
Population
None of above
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Question # 54
A little light is left to power photosynthesis at the depth of:
Choose an answer
500 feet
700 feet
600 Feet
1000 Feet
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Question # 55
Decomposers get their food from
Choose an answer
Soil particles
Dead organic matter
Green plants
Living organisms
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Question # 56
These micro-organisms use the proteins and amino acids and release excess of ammonia (NH
3
) or ammonium ions (NH
4
). This process is known as
Choose an answer
Ammonification
Nitrification
Assimilation
All of above
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Question # 57
Global warming is the result of
Choose an answer
Ozone layer depletion
Acid rain
Green house gases
All of them
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Question # 58
They may also control some long term changes
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Enzymes
Neurons
Hormones
CNS
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Question # 59
The amount of energy left after plants have met their respiratory needs is net primary production, which shows up as plant:
Choose an answer
Respiration
Photosynthesis
Biomass
Reserve
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Question # 60
Insulin receptors are present in
Choose an answer
Cytoplasm of muscle cells
Cell membrane of liver cells
Cell membrane of muscles and liver cells
Cell membrane of all body cells
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Question # 61
Allele for whiteness in Drosophilla is
Choose an answer
Recessive
Codominant
Dominant
Partially dominant
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Question # 62
What is trampling
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Eating grasses to roots
Nipping leaves
Overgrazing
Putting pressure on soil to make it compact
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Question # 63
When a haemophilic carrier woman marries a normal man, who among her offspring may be affected
Choose an answer
all her children
all her daughter
half of her daughter
half of her sons
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Question # 64
Ultimate source of all changes is :
Choose an answer
Mutation
Genetic drift
Evolution
Migration
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Question # 65
Inorganic ions can play a role of ¬¬¬¬¬¬¬______ in enzyme catalysis
Choose an answer
Coenzyme
Inhibitor
Apo enzyme
Cofactor
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Question # 66
Hormones secreted by follicles in female
Choose an answer
Estrogen
Progesterone
FSH
Both a and b
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Question # 67
Shallow water zone of the lake near the shore is called:
Choose an answer
Intertidal zone
Littoral zone
profundal zone
Limnetic zone
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Question # 68
Which of the following is not the true about predation
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Prey increases by increasing the predation
Predation increases by increasing the prey
Prey decreases by increasing the predation
Prey must follow the predation
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Question # 69
Nutrient elements become the part of protoplasm during
Choose an answer
Photosynthesis
Decomposition
Fixation
Assimilation
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Question # 70
Which are pioneers of terrestrial ecosystem
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Dermatocarpons
Parmelia
Polytrichum
None of these
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Question # 71
A symbiotic association between a fungus and the roots of higher plants is known as
Choose an answer
Lichen
Parasitism
Mycorrhiza
Commensalism
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Question # 72
The chemical elements essential for life in living organisms are called:
Choose an answer
Biogenic elements
Nutrient elements
Both a & b
Genetic elements
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Question # 73
Most of the vectors for spreading important human diseases belong to:
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Radiata
Acoelomates
Pseudocoelomates
Coelomates
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Question # 74
Which hormone require 2nd messenger
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Insulin
Estrogen
Progesterone
Testosterone
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Question # 75
The eating of grasses is termed as
Choose an answer
Grassing
Browsing
Eating
None of above
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Question # 76
Which can't increase their weight in inorganic medium
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Producer
Consumer
Decomposer
Both b & c
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Question # 77
Succinic acid is the ____ of succinic dehydrogenase which undergoes____
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Active site, reduction
Prosthetic group, reduction
Substrate, oxidation
Substrate, reduction
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Question # 78
The symbiotic relationship in which both the partners get benefit is:
Choose an answer
Parasitism
Commensalism
Predation
Mutualism
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Question # 79
Bacterial live and get food from roots of plants is an example of
Choose an answer
Symbiosis
Mutualism
Parasitism
Infestation
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Question # 80
Most unifying characteristics of all types of cells is
Choose an answer
Cell membrane
Nucleus
Ribosomes
S.E.R
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Question # 81
In deoxyribose, oxygen is removed from carbon number
Choose an answer
1
2
3
4
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