Explore topic-wise MCQs in Biology.

This section includes 5751 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.

801.

What does operon contain ?

A. Regulator gene + promotor gene
B. Operator gene + structural gene
C. Regulator gene + promotor gene structural gene
D. Regulator gene + promotor gene + operator gene + structural gene
Answer» E.
802.

The enzyme amino acyl t-RNA-synthetase facilitates.

A. Joining two neighbouring amino acids on ribosomes
B. A doption of amino acids by a t-RNA molecule
C. Insertion of amino acyl t-RNA into the ribosome sites
D. Transfer of amino acyl t-RNA from the ribosomal ‘A’ site to ‘P’ site
Answer» C. Insertion of amino acyl t-RNA into the ribosome sites
803.

Which of the following enzymes can detect and correct the wrong inserted base during DNA replication ?

A. DNA polymerase - I
B. DNA polymerase - II
C. Primase
D. Ligase
Answer» B. DNA polymerase - II
804.

HIV decrease... (MP PMT 1997)

A. Helper T-Cell
B. All T-Cells
C. Only B-Cells
D. B-Cell & T-Cell
Answer» B. All T-Cells
805.

In relation of lac operon in E-coli , Which protein is not regulated by the repressor ?

A. Tryptophan
B. galactosidase
C. Lactose permease
D. Transacetylase
Answer» B. galactosidase
806.

Response against allergic inflammation, is given by which substance produced by mast cells ? (MP PMT 1997)

A. Histamine
B. Antibody
C. Antigen
D. None
Answer» B. Antibody
807.

Which of the following amino acid is coded by 3 codons ?

A. serine
B. Proline
C. Tryptophan
D. Isoleucine
Answer» E.
808.

state the anticodon of initiation codon of protein synthesis

A. UAC
B. UUU
C. CAU
D. AUG
Answer» B. UUU
809.

Humans have approximately _____ times more genes than E.coli

A. 8
B. 15
C. 100
D. 50
Answer» E.
810.

Which is the energy source for the process of elongation ?

A. ATP
B. GTP
C. Creatine-PO4
D. All the above
Answer» C. Creatine-PO4
811.

Select the correct answer / answers from the following

A. 1, 2, 3 and 4, are corrent
B. 1 and 2 are correct, 3 and 4 are false
C. 1 and 3 are correct, 2 and 4 false
D. 1, 2, 3 are correct, 4 is false
Answer» D. 1, 2, 3 are correct, 4 is false
812.

Carcinoma refer to... (CBSE, PMT 2003)

A. Malignant tumours of the connective tissue
B. Malignant tumours of the skin or mucous membrane
C. Malignant tumours of the colon
D. Begign tumours of the connective tissue
Answer» B. Malignant tumours of the skin or mucous membrane
813.

By whom inlfuenza occurs ? (BHU 2002)

A. Viru
B. Bacteria
C. Fungi
D. Protista
Answer» B. Bacteria
814.

What are interferons ? (CBSE 2001)

A. Antiviral Protien
B. Antibacterial Protien
C. Anticancer Protien
D. Conjugated Protien
Answer» B. Antibacterial Protien
815.

Where memory cells are formed ? (DPMT 2005)

A. Monocyte
B. Eosinophills
C. Neutrophills
D. Lymphocytes
Answer» E.
816.

Which is most infectious disease ? (CBSE 2001)

A. Hepatitis - B
B. AIDS
C. Cough & Comman Cold
D. Malaria
Answer» D. Malaria
817.

Antibodies in our body are complex ? (CBSE, PMT 2006)

A. Steroid
B. Prostaglandins
C. Glycoproteins
D. Lipoprotein
Answer» D. Lipoprotein
818.

What is there as a genetic material in HIV in addition to protein layer ? (CBSE 1998)

A. The chains containing DNA
B. One chains containing DNA
C. Two chains containing RNA
D. One chains containing RNA
Answer» E.
819.

By what we get passive immunity ?

A. Antibody
B. Antigen
C. Antibiotic
D. Vaccination
Answer» B. Antigen
820.

The molecule, which stimulates the immune response is... (PMT 1997)

A. Antibody
B. Antigen
C. Mutant
D. Carcinogen
Answer» C. Mutant
821.

By What antibodies are made ? (CBSE 2003)

A. RBC
B. Thrombocytes
C. Monocytes
D. Lymphocytes
Answer» E.
822.

From given diagram identify virus then give the name of sugar in structure of nucleic acid ?

A. Ribose
B. Deoxyribose
C. both a & b
D. none of these
Answer» B. Deoxyribose
823.

Which cancer affects lymph gland and spleen ? (PMT 2004)

A. Carcinoma
B. Surcoma
C. Leukemia
D. Lymphoma
Answer» C. Leukemia
824.

Which kind of drug are obtained from given plant ?

A. Cannabinoids
B. Charas
C. Ganja
D. All of these
Answer» E.
825.

Which disease is spread by mosquito but does not occurs by virus ? (CPMT 1998)

A. Meningitie
B. Dengue fever
C. Yellow fever
D. Filarisis
Answer» B. Dengue fever
826.

AIDS spread by.... (MP PMT 1998)

A. Blood Transfusion
B. Shaking Hands
C. HIV infected blood transfusion
D. All of above
Answer» D. All of above
827.

Whose number increase during allergy ? (Manipal 1999)

A. Ig A
B. Ig E
C. Ig G
D. Ig M
Answer» C. Ig G
828.

Who is Responsible for typhoid ? (CBSE 1998)

A. Vibreo Choleri
B. Salmonella
C. Shingella
D. Eschericia Coli
Answer» C. Shingella
829.

Vaccination protects from disease, Because... (BHU 1999)

A. It helps in digestion
B. It increases the no. of RBCs
C. It produces antibodies
D. It maintains heat system of the body
Answer» D. It maintains heat system of the body
830.

Which is blood cancer ? (MP PMT 1998)

A. Chloremia
B. Leukemia
C. Uremia
D. Protemia
Answer» C. Uremia
831.

The growing immunity, after getting the disease free body (PMT 1996)

A. Active acquired immunity
B. Passiue acquired immunity
C. a & b both
D. None
Answer» B. Passiue acquired immunity
832.

Cancer of Muscle : Sarcoma. Cancer of Skin :_________

A. Sarcoma
B. Lerkemia
C. Melenoma
D. Glucoma
Answer» D. Glucoma
833.

Cancer is associated with.... (MP CPMT 1996)

A. Uncontrollable growth of tissue
B. Ageing procers
C. Controlled division of tissue
D. None
Answer» B. Ageing procers
834.

By which AIDS spread ?

A. Blood Cancer
B. T-Cell leukemia virus of Human
C. Bacterium
D. TMV
Answer» C. Bacterium
835.

Because of smoking which kind of changes occurs in blood ?

A. Proportion of CO2 decreases & in Hb also CO2 deoreases
B. Propotion of O2 decreases &in Hb propertion of O2 increases
C. Proportion of O2 increases & in Hb proportion of O2 decreses.
D. Proportion of CO2 increases & in Hb proportion of O2 decreses.
Answer» E.
836.

Where salmonella is associated ? (CBSE 2001)

A. Typhoid
B. Polio
C. TB
D. Tetanus
Answer» B. Polio
837.

Suddenly any person get rid of Alcohol or drug then which kind of deficincy accurs in that person?

A. Visual Syndrome
B. Drowns syndrome
C. Turner syndnome
D. Cry-du-chat syndrome
Answer» E.
838.

What is reason for causing AIDS.

A. Cereto immunity
B. Interferon
C. Destroying & Helper Tcells
D. Destroying of killer T cells
Answer» D. Destroying of killer T cells
839.

From what Neoplastic is generated ?

A. X ray
B.  rays
C. U.V rays
D. DNA
Answer» E.
840.

Cold-Rhino virus AIDS ______

A. Retroviru
B. Retro bacteria
C. HMV
D. Oncogenic virus
Answer» B. Retro bacteria
841.

Opium : Morphine - Pain reliever medicineCannabinoid : _________ - _________

A. Tobacco, Nicotine
B. Cocain, Erthroxylum
C. Marijuana, Produce more quantity of urine
D. Ergot, change mood
Answer» D. Ergot, change mood
842.

In which disease prepared antibodies are entered ?

A. Chicken pox
B. T.B
C. Cold
D. Rabies
Answer» E.
843.

From what Lysergic acid is formed ?

A. Ergot fungi
B. Cannabinoids plants
C. Heroine
D. THC
Answer» B. Cannabinoids plants
844.

Match the column-I, column-II & column-II.

A. P-(iv)-(III), Q-(ii)-(II), R-(iii)-(IV), S-(i)-(I)
B. P-(iii)-(II), Q-(ii)-(I), R-(iv)-(III), S-(i)-(IV)
C. P-(ii)-(I), Q-(iii)-(III), R-(i)-(IV), S-(iv)-(II)
D. P-(i)-(IV), Q-(iv)-(III), R-(iii)-(II), S-(ii)-(I)
Answer» B. P-(iii)-(II), Q-(ii)-(I), R-(iv)-(III), S-(i)-(IV)
845.

Genetic material of virus in macrophege is regenerated in DNA by which enyme ?

A. Transcriptase
B. Reverse Transcriptasce
C. RNA polymerase
D. DNA polymeane
Answer» C. RNA polymerase
846.

W.B test : AIDS - Immuno deficiency syndrome WIDAL test : ________ , ________

A. Typhoid, increase in size of spleen & liver
B. Typhoid, pain in stomach
C. Typhoid, Burning in felt in intestine
D. All of the given
Answer» E.
847.

Which one is right sequence for lifecycle of Anopheles mosquito ?

A. Oocyst  ookinesesporozoitesgamatooyte
B. Ookineteoocystgamatocytesporozoites
C. Gamatoeyteoocystsporozoitesookinete
D. Gamatocyteookineteoocystsporozoites
Answer» E.
848.

Which plant is responsible for doing hallucination ?

A. Atropa Baladona
B. Datura
C. Erythroxylum coca
D. All of the given
Answer» E.
849.

Contegious disease- Typhoid.Non contogious diseace _______

A. AID
B. Hepatitis
C. Malaria
D. Cancer
Answer» E.
850.

Tears in eye : Physiological Barrier Skin : __________

A. Physical Barrieer
B. Physiological Barrier
C. Cellular Barrier
D. Cytokine Barrier
Answer» B. Physiological Barrier