Biology Mcqs – (Science) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
“ Biology Mcqs “. Tab this page to check “Latest Biology MCQs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Biology in past papers. Past papers of Biology mcqs. Past papers of Biology MCQs. Biology Mcqs are the necessary part of any competitive / job related exams. The Biology mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Biology mcqs. The Important series of Biology Mcqs are given below:
______________ of earth surface is covered with water?
A. 30%
B. 10%
C. 75%
D. 90%
An antibody is made of _________ polypeptide chains?
A. 2
B. 1
C. 3
D. 4
Production of genetically identical copies of organisms/cells by asexual reproduction is called__________?
A. Replication
B. Mitosis
C. Cloning
D. Biological control
95% of the cytoplasm of RBCs is____________?
A. Hemoglobin
B. Salts
C. Enzymes
D. Other proteins
_________________ cells of phloem are directly involved in transport of organic solutes?
A. Companion cell
B. Parenchyma
C. Tracheid
D. Sieve element
An infectious disorder of respiratory system is_________________?
A. Asthma
B. Cancer
C. Tuberculosis
D. Emphysema
Cuticular transpiration is _____________ of total transpiration?
A. 3-4%
B. 1-2%
C. 5-7%
D. 90%
According to cohesion-tension theory, tension is created by__________________?
A. Adhesion
B. Transpiration
C. Hydrogen bonding
D. Root prerssure
Deoxygenated blood first enters in _________ part in fishes?
A. Sinus venosus
B. Left atrium
C. Right atrium
D. Conus arteriosus
Ozone depletion occurs commonly due to_______________?
A. UV rays
B. Chlorofluorocarbons
C. Carbon dioxide
D. Deforestation
Who coined the term CELL?
A. Schleiden
B. Schwann
C. Robert Hook
D. Both a and b
“lubb” sound is produced due to___________________?
A. Opening of outlet valve
B. Closure of inlet valve
C. Opening of inlet valve
D. Closure of outlet valve
In condition of high temperature, following does not occur or occurs at low level__________?
A. Activation of sweat glands
B. Vasodilation
C. Thermogenesis
D. Evaporative cooling
Who first observed and thus hypothesized that new cells are formed from previously existing living cell?
A. Louis Pasteur
B. Rudolph Virchows
C. Theodor Schwann and Schleiden
D. Both b and c
In Hardy-Weinberg formula P2 represents frequency of_____________?
A. Dominant allele
B. Recessive allele
C. Homozygous dominant individual
D. Homozygous recessive individual
_____________ supported theory of special creation?
A. Linnaeus
B. Mendel
C. Aristotle
D. Lamarck
Percentage of proteins in cell membrane is____________?
A. 40-50%
B. 20-40%
C. 60-80%
D. 80-100%
Which of the following is most constant abiotic component of ecosystem___________?
A. Air
B. Land
C. Water
D. Gravity
Ecosystem not found in Pakistan is_____________?
A. Tropical rain forest
B. Grassland
C. Temperate deciduous forest
D. Tundra
Movement of the material across the cell membrane which does not requiring expenditure of metabolic energy is called__________?
A. Co-transport
B. Passive transport
C. Active transport
D. Counter transport
The productivity of aquatic ecosystem is basically determined by light and____________?
A. O2
B. CO2
C. Water
D. Nutrients
The first layer of cell wall which is formed is___________?
A. Primary wall
B. Middle lamella
C. Secondary wall
D. All of these
Annual rainfall in grassland is about_____________?
A. 750-1500 mm
B. More than 2500 mm
C. 250-750 mm
D. Less than 250 mm
Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due_____________?
A. Nitrobacter
B. Nitrosomonas
C. Rhizobium
D. Pseudomonas
Cellulose is the major component of__________?
A. Primary wall
B. Middle lamella
C. Secondary wall
D. all of the above
Humming bird is an example of________________?
A. Ectotherm
B. Cold blooded animal
C. Endotherm
D. Heterotherm
Number of cervical vertebrae is_____________?
A. 9
B. 7
C. 5
D. 12
Autophagosomes are____________?
A. Those lysosomes which eat parts of their own cells to generate energy.
B. Lysosomes which help in extracellular digestion
C. Those lysosomes which eat old and worn out cellular organelles.
D. Both a and b
Sapwood is formed from_____________?
A. Primary phloem
B. Secondary xylem
C. Primary xylem
D. Secondary phloem
Which of the following cytoskeletal fiber contain tubulin protein?
A. One which help in assembly of spindles during mitosis.
B. One involved in maintenance of cell shape.
C. One involved in internal cell motion.
D. Both b and c
Only myosine is present in_____________?
A. 1 band
B. A band
C. H zone
D. Sarcomere
Biology Mcqs
Joints present in skull are example of_______________?
A. Fibrous joints
B. Synovial Joints
C. Cartilaginous joints
D. Slightly moveable joints
The human naked eye can differentiate between two points which are __________ apart?
A. 1.0 mm
B. 1.0 cm
C. 0.1 mm
D. 1.0 dm
_____________ is a nervous disorder characterized by involuntary tremors, diminished motor power and rigidity?
A. Epilepsy
B. Alzheimer’s disease
C. Meningitis
D. Parkinson’s disease
Of the following which one is not the characteristic of mitochondria?
A. It is a self replicating organelle
B. It is involved in the synthesis of protein
C. It contains F1 particles
D. Number of mitochondria is constant
In human female, fertilization commonly occurs at______________?
A. Proximal part of oviduct
B. Uterus
C. Distal part of oviduct
D. Cervix
The part of chloroplast where CO2 is fixed to manufacture sugar is__________?
A. Stroma
B. Thylakoid
C. Grana
D. Outer membrane
Highest form of learning is__________________?
A. Instinct
B. Insight learning
C. Operant conditioning
D. Latent learning
Which of the following hormone is polypeptide in nature____________?
A. Thyroxine
B. Insulin
C. ADH
D. Cortisone
Ribosomes are assembled in__________?
A. Nucleolus
B. DNA
C. Nucleus
D. RNA
Far-red light promotes flowering in_______________?
A. Short day plant
B. Day neutral plant
C. Long day plant
D. None of these
Which of the following is not present in mitochondria?
A. Co-enzymes
B. Enzymes
C. Ribosomes
D. Thylakoids
Secretin inhibits production of__________________?
A. Gastric juice
B. Bile
C. Pancreatic juice
D. All of these
Yellowish glandular structure which produces progesterone is_____________?
A. Ovary
B. Graffian follicle
C. Corpus luteum
D. Placenta
The stent energy in the form of ADP is regenerated by mitochondria into__________?
A. ADP
B. AMP
C. ATP
D. All of these
XO-XX pattern of sex determination is present in______________?
A. Grasshopper
B. Drosophila
C. Butterfly
D. Man
On which of the following component of chloroplast chlorophyll is arranged?
A. Matrix
B. Cell membrane
C. Thylakoids
D. Stroma
An example of codominance is______________?
A. B’ blood group
B. A’ blood group
C. O’ blood group
D. AB’ blood group
Test cross is used to find_____________?
A. Phenotype
B. Trait
C. Genotype
D. Ratios
Number of nuclear pores/nucleus in an RBC are_________?
A. 10000
B. 3?4
C. 1?3
D. 30000
Yellow cytoplasm in ascidian gives rise to______________?
A. Gut
B. Muscle cells
C. Epidermis
D. Notochord
Chlorophyll molecule contrains __________ as central metal ion.
A. Zn2+
B. Mg2+
C. Fe2+
D. Cu2+
Okazaki fragments are connected together through action of_________________?
A. Polymerase
B. Primase
C. Helicase
D. Ligase
Which of the following combination is an example of self replicating organelles?
A. Mitochondria Nucleus
B. Mitochondria Ribosomes
C. Mitochondria Chloroplast
D. Mitochondria Vacuole
Which of the following is an autosomal disorder______________?
A. Down’s syndrome
B. Turner’s syndrome
C. Klinifelter’s syndrome
D. Jacob’s syndrome
The place of centromere where spindle fibres get attached is_________?
A. Kinetochore
B. Centromere region
C. Kinochore
D. all of these
Embryonic induction is caused by part developing from_____________?
A. Ectoderm
B. Endoderm
C. Mesoderm
D. Extraembryonic layers
Sickle cell anemia is an example of_________________?
A. Insertion of gene
B. Chromosomal aberration
C. Deletion of gene
D. Point mutation
The type of plastids which help in pollination is_________?
A. Chromoplasts
B. Chloroplasts
C. Leucoplasts
D. All of these
Purines and pyrimidines are in equal ration in DNA. It was indicated by_______________?
A. F.Miescher
B. Chargaff
C. Watson & Crick
D. Harshay & Chase
Chlorophyll is a/an _____ molecule?
A. Cationic
B. Inorganic
C. Anionic
D. Organic
Ribonucleo-protein particles are the name of__________?
A. Nucleus
B. DNA
C. Eukaryotic ribosomes
D. RNA
Lock and Key model was proposed by______________?
A. Emil Fischer
B. Robin Williams
C. Koshland
D. Rudolph Virchow
Which step causes activation of catalytic site of an enzyme__________________?
A. Change in temperature
B. Formation of Enzyme Susstrate complex.
C. Change in the charge of the active site.
D. Change in pH of the surroundings.
Amoeboid movements and movement of cyclosis is due to_________?
A. Microfilaments
B. Intermediate filaments
C. Microtubules
D. Cytoskeleton
Enzymes __________________ the activation energy of a chemical reaction?
A. Does not effect
B. Decreases
C. Increases
D. Increases or decreases depending upon individual enzyme
Which one forms the raw material for coenzymes_______________________?
A. Vitamins
B. Proteins
C. Carbohydrates
D. Metals
Proteins and lipids are converted into glycolipids and glycoproteins by adding carbohydrates by___________?
A. Cytoplasm
B. Ribosomes
C. Golgi apparatus
D. Endoplasmic reticulum
Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called_____________________?
A. Coenzymes
B. Cofactor
C. Activator
D. Enzymes
In which of the following location enzymes controlling cellular respiration are present____________?
A. Chlorophast
B. Nucleus
C. Milochondria
D. Ribosome
In golgi apparatus the maturing face is____________?
A. Convex
B. Biconcave
C. Spherical
D. Concave
A cofactor made of inorganic ion which is detachable is called__________________?
A. Coenzyme
B. Prosthetic group
C. Activator
D. Cofactor
An activated enzyme consisting of polypeptide chain and a cofactor is called_______________?
A. Holoenzyme
B. Apoenzyme
C. Activated enzyme
D. Both b and c
Centrioles are composed of ________ triplets of microtubules.
A. 10
B. 9
C. 3
D. 15
Which statement about enzyme is incorrect_________________?
A. Some of them consist solely of protein with no non protein part.
B. They without their cofactor are called apoenzyme.
C. All enzymes are fibrous Proteins.
D. They catalyze a chemical reaction without being utilized.
A three dimensional cavity bearing a specific charge by which the enzyme reacts with its substrate is called_________________?
A. Active site
B. Catalytic site
C. Binding site
D. Allosteric site
Cellular organelles related with H2O2 are___________?
A. Lysosomes
B. Glyoxisomes
C. Peroxisomes
D. Ribosomes
If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because_____________?
A. There is probably more substrate present than there is enzyme.
B. There is probably more enzayme available than there is substrate.
C. The enzyme substrate complex is probably failing to form during the reaction
D. There is probably more product present than there is either substrate or enzyme.
A group of ribosomes attached to mRNA is known as___________?
A. Polypeptide
B. Polymer
C. Polysomes
D. Monomer
The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________?
A. If the concentration is doubled the rate will become two fold.
B. This relation is for unlimited time period with unlimited enzyme concentration
C. Increase in enzyme molecule increases the available active sites.
D. None of these.
Which statement is incorrect about Lock and Key Model________________?
A. Active site of an enzyme is a non flexible structure
B. Specific enzyme can transform only a specific substrate
C. Active site does not change before during or even after the reaction
D. It explains the mechanism of every chemical reaction
If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of____________________?
A. Rate of reaction is indirectly proportional to substrate concentration at this point
B. Enzymes get denatured at higher substrate concentration
C. All the active sites on enzyme molecule are occupied
D. None of these
The active site of an enzyme______________?
A. They are non specific in their action
B. Forms no chemical bond with substrate
C. Determined by structure and the specificity of the enzyme
D. Never changes
Factory of Ribosomal systhesis is__________?
A. Nucleus
B. Cytoplasm
C. Nucleolus
D. Endoplasmic reticulum
If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation___________?
A. Saturation
B. Composition
C. Denaturation
D. Inhibition
Who opposed the idea the cell is an empty space bounded by thick wall?
A. Schwann
B. Lorenz Oken
C. Robert Brown
D. Rudolph Virchow
Extreme change in pH results in______________?
A. Change in ionization of amino acids at the active site of the enzyme
B. Increase in the reaction rate
C. Denaturation of the enzyme
D. Change in the ionization of the substrate
Resolution power of a compound microscope is___________?
A. 2.0 ?m
B. 24 ?m
C. 2-4 A
D. 24 A
Excessive increase in temperature of medium causes the enzyme molecule to____________?
A. Unaffected
B. Activate
C. Denatured
D. None of these
If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction____________________?
A. increase in concentration of enzyme
B. increase in pH
C. increase in concentration of substrate
D. increase in temperature
In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon____________?
A. Their physical properties like size & weight.
B. Physical properties of the medium like its density.
C. None of these.
D. Both a and b
The structure of an enzyme is altered by____________?
A. Irreversible inhibitor
B. Competitive inhibitor
C. Reversible inhibitor
D. Non-competitive inhibitor
Malonic acid is an example of____________?
A. Reversible inhibitor
B. Irreversible inhibitor
C. Competitive inhibitor
D. Non-competitive inhibitor
Magnifying power of electron microscope as compared to eye is____________?
A. 500000X
B. 250000X
C. 500 X
D. 250X
Inhibitors which block the enzyme by forming weak bond are called___________?
A. Competitive inhibitors.
B. Irreversible inhibitors.
C. Non-competitive inhibitors
D. Both a and b
Which of the statement about cell membrane is not true?
A. It contains protein molecules embedded in lipid bilayer
B. It may get infolded to engulf solid or liquid material.
C. It contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles.
D. It is a differentially permeable membrane.
A substance which binds at the active site of the enzyme but does not result in the formation of the products is called________________?
A. Reversible inhibitor
B. Irreversible inhibitor
C. Competitive inhibitor
D. Non-competitive inhibitor
A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called_______________?
A. Blocker
B. Co-enzyme
C. Inhibitor
D. Cofactor
Optimal temperature of enzymes present in human body is_____________?
A. 47?C
B. 37?C
C. 27?C
D. 30?C
Strengthening material of prokaryotic cell wall is__________?
A. Chitin
B. Cellulose
C. Inorganic salts silica waxes and ligin
D. Peptidoglycan or Murein.