If you are a student of biology and going to appear in either fsc annual exams or the uhs mdcat then you are on the right page because here we have shared the Biology MCQs for FSc and MDCAT
BIOLOGICAL MOLECULES
1. Water is an excellent solvent for ......... substances.
A) Ionic
B) Polar
C) Non ionic
D) All of these
2. Percentage of water in different organisms is:
A) 55 - 75%
B) 65 - 85 %
C) 69 - 85 %
D) 65 - 89%
3. Heat capacity of water is :
A) 0.1 cal / g
B) 1.0 cal / kg
C) 0.1 K cal / g
D) 1.0 cal / g
4. Animals use ...... to gain cooling effect :
A) Perspiration
B) Evaporation
C) Sweating
D) All
5. In glycosidic linkage,there is a ....... bond between C & O.
A) Single
B) Double
C) Triple
D) Ionic
6. Which of the following has lower molecular weight:
A) ATP
B) Glycogen
C) Waxes
D) Glucose
7. Which one is an intermediate source of energy for cellular metabolism.
A) Glucose
B) Lactose
C) ATP
D) Lipids
8. Brain cells of human contain ..... water.
A) 75%
B) 80%
C) 85%
D) 89%
9. Water has greater heat capacity because provided heat is mostly used:
A) To increase its temperature
B) To break inter molecular forces
C) To break intra molecular forces
D) Both a & c
10. The heat of vaporization of water is:
A) 574 Kcal/g
B) 576 kJ/kg
C) 576 Kcal/g
D) 574 Kcal/kg
11. It is main source of carbohydrate for animals :
A) Starch
B) Glycogen
C) Cellulose
D) Glucose
12. Which one is false about carbohydrates:
A) Primary products of photosynthesis
B) Polyhydroxy aldehydes or ketones
C) Abundant compounds in livings
D) Highest energy sources
13. Which one is a reducing sugar :
A) Glucose
B) Sucrose
C) Lactose
D) Maltose
14. Tetroses are rare in nature and occur in some :
A) Bacteria
B) Yeast
C) Protists
D) Protozoa
15. Blood contains .... glucose.
A) 0.8%
B) 1.75%
C) 0.25%
D) 0.08%
16. ........ of solar energy is used for synthesis of 10g of glucose.
A) 716.6 cal
B) 717.6 cal
C) 717.7 Kcal
D) none
17. Which one is not a disaccharide:
A) Maltose
B) Fructose
C) Lactose
D) Sucrose
18. The covalent bond present between glucose and fructose is:
A) Glycosidic linkage
B) 1,3 Glycosidic bond
C) 1,2 Glycosidic linkage
D) both a & b
19. Polysaccharides are the polymers of :
A) Monosaccharides
B) Oligosaccharides
C) Disaccharides
D) none
20. Amylose starch is:
A) soluble in hot water
B) soluble in cold water
C) insoluble in hot water
D) both b&c
21. Which is stored in liver and muscles.
A) Starch
B) Cellulose
C) Glucose
D) Glycogen
22. A covalent bond between two monosaccharides is :
A) Peptide bond
B) Glycosidic bond
C) Phosphodiester bond
D) Hydrogen bond
23. It gives no color with iodine :
A) Glucose
B) Starch
C) Glycogen
D) Cellulose
24. Saccharides having three carbon atoms in them are called :
A) Trisaccharide
B) Triglycerides
C) Triacylglycerols
D) Trioses
25. Glucose forms a six carbon ring in solution :
A) Ribopyranose
B) Glucofuranose
C) Ribofuranose
D) Glucopyranose
( LIPIDS, PROTEINS and Nucleic Acids)
1. Lipids are a heterogeneous group of compounds related to .........
A) Amino acids
B) Fatty acids
C) Nucleic acids
D) All
2. Lipids are soluble in:
A) Polar solvents
B) Non polar solvents
C) Inorganic solvents
D) both b&c
3. Lipids store double amount of energy as compared to same quantity of carbohydrates due to:
A) High proportion of oxygen
B) Low proportion of C-H bonds
C) High proportion of C-H bonds
D) Both a&c
4. Additional protective layer on the cuticle of epidermis is:
A) Chitin
B) Waxes
C) Cutin
D) Both a&c
5. In esterification, H is removed from ....... and OH is removed from ....... .
A) Fatty acid , glycerol
B) Alcohol , Water
C) Alcohol , Fatty acid
D) Glycerol , Acid
6. Boiling point of Butyric acid is:
A) -2°C
B) -4°C
C) -6°C
D) -8°C
7. Which of the following is unsaturated fatty acid:
A) Acetic acid
B) Butyric acid
C) Palmitic acid
D) Oleic acid
8. The specific gravity of oils and fats is:
A) 0.3
B) 0.6
C) 0.8
D) 0.9
9. Waxes are the mixtures of long chain alkanes and ........ , ....... & .......
A) Aldehydes,Ketones,Alcohol
B) Esters,Aldehydes,Ketones
C) Alcohol,Ether,Ketones
D) Esters,Alcohol,Alkanones
10. Phosphatidylcholine is also called:
A) Lectin
B) Ethanolamine
C) Choline
D) Lecithin
11. Proteins form ...... of total dry weight.
A) 40%
B) 50%
C) 60%
D) 70%
12. Which is false about proteins.
A) Abundant organic compounds
B) Polymers of amino acids
C) They have polypeptide chains
D) All proteins are enzymes
13. Most of the proteins are made up of ..... types of amino acids.
A) 20
B) 25
C) 170
D) 10,000
14. In glycine, R is:
A) Hydrogen atom
B) Methyl group
C) Ethyl group
D) Proton
15. In the formation of peptide bond, H is released from ...... and OH is removed from ......
A) Amino acid, Amino group
B) Amine group, Carboxylic group
C) Carboxylic acid, Amino group
D) both a&c
16. How many peptide linkages are present in Haemoglobin molecule:
A) 570
B) 571
C) 573
D) 574
17. Sickle cell haemoglobin is caused by incorrect arrangement of one amino acid in:
A) Alpha chain
B) Beta chain
C) Short chain
D) Both a&c
18. Helical structure of proteins is kept by:
A) Hydrogen bond
B) Ionic bond
C) Peptide linkage
D) Disulphide bridge
19. Head region of phospholipid molecule is:
A) Polar,Hydrophilic
B) Non polar,Hydrophilic
C) Polar,Hydrophobic
D) Non polar,Hydrophobic
20. Haemoglobin exhibits ...... structure.
A) Primary
B) Secondary
C) Tertiary
D) Quaternary
21. In stable aqueous tertiary structure of proteins, ....... amino acids are present on the surface.
A) Hydrophilic
B) Hydrophobic
C) Stable
D) both a&c
22. Non polar region of phospholipid molecule contains:
A) Phosphoric acid
B) Phosphate group
C) Fatty acids
D) Glycerol
23. Myosin is found in:
A) Bones
B) Muscles
C) Nails
D) Blood
24. Globular proteins are:
A) Non crystalline
B) Soluble in aqueous media
C) Crystalline
D) both b&c
25. DNA is found in:
A) Nucleus
B) Mitochondria
C) Chloroplasts
D) All
26. Nucleic acids are the ploymers of ........
A) Nucleotides
B) Ribonucleotides
C) Deoxyribonucleotides
D) None
27. Identify the pyrimidines.
A) Adenine,Guanine,Cytosine
B) Adenine,Thymine,Uracil
C) Adenine,Guanine
D) Thymine,Uracil,Cytosine
28. Phosphoric acid is attached to ..... position of ribose sugar.
A) 1
B) 3
C) 4
D) 5
29. Thymidine is a
A) Nitrogeneous base
B) Deoxyribonucleotide
C) Ribonucleotide
D) Nucleoside
30. Which of is following is a nucleotide:
A) ATP
B) NAD
C) DNA
D) RNA
31. There is a ......bond between A & T
A) Phosphodiester bond
B) Double hydrogen bond
C) Triple hydrogen bond
D) Both a&b
32. Which is false about DNA:
A) Polymer of nucleotides
B) Heredity material of cell
C) Helical structure
D) It can undergo transcription
33. Adenine always form bond with:
A) Cytosine
B) Thymine
C) Uracil
D) both b&c
34. Ribosomal RNA forms ....... of total RNA.
A) 70%
B) 80%
C) 90%
D) 20%
35. Most of the cellular secretions are ...... in nature.
A) Glycoproteins
B) Glycolipids
C) Lipo-proteins
D) Nucleo proteins
The Cell
1. Human eye can differentiate between two points. This is called :
A) Magnification
B) Resolution
C) Power
D) Centrifugation
2. The magnification of a microscope having 20X ocular lens and 50X objective lens is :
A) 50 X
B) 100 X
C) 150 X
D) 200 X
3. All are found in a plant cell except :
A) Vacuole
B) Ribosome
C) Lysosome
D) Golgi Apparatus
4. Percentage of proteins in plasma membrane is :
A) 20 - 40 %
B) 30 - 60 %
C) 50 - 70 %
D) 60 - 80 %
5. All can easily pass through plasma membrane except :
A) Water
B) Glucose
C) Ions
D) Gas molecules
6. Energy for active transport is provided by :
A) ATP
B) Glucose
C) Vitamins
D) Minerals
7. The process in which a cell takes in solid material through cell membrane :
A) Endocytosis
B) Phagocytosis
C) Pinocytosis
D) Exocytosis
8. SER is involved in metabolism of :
A) Glucose
B) Proteins
C) Lipids
D) Saccharides
9. The attachment of smaller and larger subunit of ribosome is controlled by the presence of :
A) Calcium ions
B) Magnesium ions
C) Potassium ions
D) Ferrous ions
10. It is involved in the synthesis of proteins :
A) Ribosome
B) SER
C) RER
D) Both a & c
11. Vesicles add into golgi body from :
A) Outer face
B) Concave face
C) Maturing face
D) Inner face
12. It is associated with cell secretions :
A) Ribosome
B) RER
C) Lysosomes
D) Golgi Apparatus
13. Any foreign material that gains entry into the cell is immediately engulfed by :
A) Golgi Apparatus
B) Cell membrane
C) Lysosomes
D) Vacuole
14. Lysosome is responsible for :
A) Phagocytosis
B) Autophagy
C) Extracellular digestion
D) All of these
15. Tay-Sach's disease is due to absence of enzymes involved in catabolism of :
A) Lipids
B) Glucose
C) Glycogen
D) Proteins
16. It provides turgor pressure to cell :
A) Cytoplasm
B) Microtubule
C) Centriole
D) Vacuole
17. Microtubules are composed of ...... protein.
A) Actin
B) Myosin
C) Tubulin
D) Troponin
18. Centriole is found in :
A) Animals
B) Plants
C) Fungi
D) All of these
19. It plays an important role in formation of cilia and flagella :
A) Centriole
B) Vacuole
C) Microtubule
D) Both a & c
20. Inner membrane of mitochondria form many infoldings in the inner mitochondrial matrix called :
A) Cisternae
B) Vesicles
C) Cristae
D) Granum
21. Identity cell replicating organelle :
A) Nucleus
B) Chloroplast
C) Mitochondria
D) All of these
22. All metabolic processes take place in ..... of mitochondria.
A) Outer compartment
B) Inner membrane
C) Cristae
D) Matrix
23. Diameter of chloroplasts is :
A) 2 - 3 ųm
B) 2 - 4 ųm
C) 4 - 6 ųm
D) 6 - 8 ųm
24. It covers most of volume of chloroplasts :
A) Granum
B) Thylakoids
C) Intergranum
D) Stroma
25. Circular DNA is found in :
A) Mitochondria
B) Chloroplasts
C) Nucleus
D) Lysosomes
26. They found in underground parts of plants and store food :
A) Chloroplasts
B) Chromoplasts
C) Leucoplasts
D) Cycloplasts
27. A granum is composed of .... thylakoids.
A) 10
B) 20
C) 50 or less
D) 50 or more
28. A group of ribosomes on mRNA is :
A) SER
B) RER
C) Polysomes
D) Multisomes
29. Nucleus is visible during :
A) Non dividing stage
B) Mitotic phase
C) Interphase
D) Both a & c
30. Nuclear pores in erythrocytes is :
A) 2 - 3
B) 3 - 4
C) 4 - 5
D) 30,000
31. A darkly stained body within nucleus is :
A) Ribosome
B) mRNA
C) Chtomatin
D) Nucleolus
32. Central area of nucleolus consists of :
A) DNA base units
B) Ribosomal subunits
C) RNA and rDNA
D) Chromosomes
33. Nucleus is often deeply stained with ..... dyes.
A) Acidic
B) Basic
C) Neutral
D) None
34. It is exact replica of chromosomes :
A) Chromatid
B) Centromere
C) Centrosome
D) Secondary constriction
35. Chimpanzee has ..... chromosomes.
A) 32
B) 40
C) 46
D) 48
36. A group of cisternae is called :
A) Golgi Apparatus
B) Golgi complex
C) Lysosomes
D) Both a & b
37. 60 S larger subunit of ribosome combines with 40 S smaller subunit to form ........ particle.
A) 70 S
B) 80 S
C) 90 S
D) 100 S
38. Haem portion of haemoglobin consists of :
A) Magnesium ions
B) Calcium ions
C) Potassium ions
D) Ferrous ions
39. It is present in both prokaryotic and eukaryotic cells :
A) Ribosome
B) Cytoplasm
C) DNA
D) All of these
40. A complex of amino acids and saccharides is :
A) Saccule
B) Pillin
C) Flagellin
D) Murein
Variations and Genetics
1. The position of a gene on chromosomes is :
A) Alleles
B) Locus
C) Karotype
D) Genotype
2. Genotype for round seeded plants is :
A) RR
B) rr
C) Rr
D) Both A and C
3. It is used to check the genotype of an individual showing dominant phenotype :
A) Test cross
B) Monohybrid test
C) Dihybrid cross
D) Both A and B
4. When a true breeding round seeded plant is crossed with a true breeding wrinkled seeded plant, probability of round seeded plants in F2 generation :
A) 1/4
B) 3/4
C) 1/2
D) 1/3
5. A girl was married to her cousin. Both are heterozygous for blood cancer. The percentage of their affected offspring will be :
A) 25%
B) 50%
C) 75%
D) 100%
6. If presence of recessive allele is phenotypically suppressed by dominant allele , the condition will be :
A) Complete Dominance
B) Codominance
C) Over Dominance
D) Incomplete Dominance
7. More than two alternating forms of a single gene is called :
A) Dominant alleles
B) Recessive alleles
C) Multiple alleles
D) Polygenic alleles
8. A child in hospital has parenthood issue. Blood group of child is "O". Two couples are claiming to be the parents of child. Couple | has blood groups "B" and "A". Couple || has blood groups "O" and "AB".
Child belongs to :
A) Couple |
B) Couple ||
C) Neither couple | nor couple ||
D) Either couple | or couple ||
9. Which one is an example of discontinuous variations ?
A) Intelligence
B) Skin color
C) ABO blood group system
D) Height and weight
10. Gene linkage is a .... relationship between genes.
A) Physical
B) Chemical
C) Biological
D) Mechanical
11. How many percentage of haemophiliacs suffer from Haemophilia A ?
A) 30%
B) 50%
C) 80%
D) 90%
12. If a haemophiliac male is married to a normal female whose father was haemophiliac. What will the percentage of their affected daughters ?
A) 0%
B) 25%
C) 50%
D) 100%
13. A colour blind woman is married to a normal man. What will be the ratio of affected offsprings.
A) 0%
B) 100%
C) 75%
D) 50%
14. Gene for blue opsin is found on :
A) Autosome 7
B) Autosome 9
C) Autosome 11
D) Autosome 19
15. In F2 dihybrids, what will be the probability of plant height and flower color ?
A) 3/16 Dwarf Purple , 1/16 Tall White
B) 9/16 Tall White , 3/16 Dwarf Purple
C) 1/16 Dwarf white , 3/16 Tall white
D) 3/16 Dwarf Purple, 9/16 Tall White
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