R4RIN – MCQs, Mock Tests | ICSE XII MCQ Questions for Class 12 Biology Set 4

Which is not component of lac operon:

1. Primer gene
2. Promoter gene
3. constructive gene
4. Regulator gene

✅ Correct Answer: 3

Okazaki fregments is:

1. RNA primer
2. small segments of DNA on leading stand
3. Small segments of DNA on lagging stand
4. None of these

✅ Correct Answer: 3

Transposons occur in:

1. In Eukaryotes
2. In Prokaryotes
3. In both (a) and (b)
4. None of these

✅ Correct Answer: 3

One of these is not prepared directly from DNA

1. m-RNA
2. f-RNA
3. r-RNA
4. Protein

✅ Correct Answer: 4

Coiling of DNA duplex is:

1. Left-handed
2. Right-handed
3. Parallel
4. All of these

✅ Correct Answer: 3

DNA double helix model was given by:

1. Knoll and Ruska
2. Khorana
3. Watson and Crick
4. Priestley

✅ Correct Answer: 3

Inprokaryotic translation, GTP molecule required in at:

1. Formation of formyl-met-f-RNA
2. Joining of 30S sub-unit of ribosome with n-RNA
3. Joining of 30S m-RNA on Formyl-met-f-RNA
4. Joining of 50S subunit of ribosome with initiation complex

✅ Correct Answer: 2

DNA transcription, if nucleotide sequence of DNA strand, that is being coded in ATACG, then the nucleotide sequence in m-RNA would be:

1. UATGC
2. TATGC
3. TCTGG
4. UAUGC

✅ Correct Answer: 2

In a m-RNA, how many nucleotide sequence code for amino acid:

1. One
2. Two
3. Three
4. Four

✅ Correct Answer: 1

RNA from which has clover leaf model:

1. f-RNA
2. r-RNA
3. hn-RNA
4. m-RNA

✅ Correct Answer: 1

Nitrogenous bases present in DNA:

1. Adenine, guanine, cytosine, thymine
2. Adenine, guanine, cytosine, uracil
3. Adenine, thymine, uracil
4. Guanine, uracil

✅ Correct Answer: 1

Missing link in evolution is:

1. Pheretima
2. Limulus
3. Peripatus
4. Archaeopterys

✅ Correct Answer: 4

Hardy-Weinberg principle explains :

1. Chromosomal
2. Genetic drift
3. Genetic equilibrium
4. All of these

✅ Correct Answer: 3

As per Neo-Darwinism, which is mainly responsible for evolution?

1. Mutation
2. Natural drift
3. Both of these
4. All of these

✅ Correct Answer: 2

Dispersal of population depends on:

1. On immigration
2. On Emigration
3. On Migration
4. All of these

✅ Correct Answer: 4

Evolutionary history of an organism is known as:

1. Ontogeny
2. Phytogeny
3. Ancestry
4. Palaentolgy

✅ Correct Answer: 2

Book ‘Philosophique Zoologique’ was written by:

1. Lamarck
2. Mendel
3. Darwin
4. Hugo-devries

✅ Correct Answer: 1

Which one of the following phenomenon supports Darwin’s concept of natural selection in organic evolution?

1. Development of transgenic animals
2. Production of‘Dolly the sheep’ by cloning
3. Prevalence of pesticide resistant insects
4. Development of organs from ‘Stem cells’ for organ transplantation

✅ Correct Answer: 3

The biogenetic law of Haeckel is:

1. Ominis vivum-e-eellula
2. Omminis cellula-e-cellula
3. Ontogeny repeats phytogeny
4. Phytogeny repeats ontogeny

✅ Correct Answer: 3

Wings of Butterfly and birds are:

1. Vestigial organs
2. Analogous organs
3. Homologous organs
4. Both (a) and (b)

✅ Correct Answer: 2

Theory of Pangenesis was given by:

1. Darwin
2. Lamarck
3. Weismann
4. DeVries

✅ Correct Answer: 1

Pain-killer drugs:

1. Makes Tissue
2. Relieve from pain
3. Relieve from tired
4. Pain creater

✅ Correct Answer: 3

AIDS caused by:

1. By fungus
2. By Virus
3. By Bacteria
4. By Helminthes

✅ Correct Answer: 2

Immune deficiency symdrome is caused by:

1. Defected liver
2. Defected thymus
3. AIDS Virus
4. Loss of Immune system

✅ Correct Answer: 3

Opium is:

1. Hemp
2. Charas
3. Heroin
4. Nicotin

✅ Correct Answer: 3

AIDS occur by which cause?

1. Reduction of T-Helper cells
2. Reduction of Killer T-cells
3. Auto immune
4. Less production of interferon

✅ Correct Answer: 1

Heroin is the form of :

1. Aesthetic
2. Hallucination
3. Irritation
4. All of the above

✅ Correct Answer: 2

Caffein, Amphetamine and coceins are:

1. Pain Killer
2. Tranquillizer
3. Hallucination
4. Stimulant

✅ Correct Answer: 4

Following is Hallucinator

1. LSD
2. Heroin
3. Cocein
4. Morphin

✅ Correct Answer: 1

World AIDS day is:

1. 1 May
2. 20 December
3. 1 June
4. 1 December

✅ Correct Answer: 4

By the plant of which family Heroin is obtained?

1. Leguminaceae
2. Papa Veraceae
3. Liliaece
4. Solanaceae

✅ Correct Answer: 2

Opiates are obtained from

1. Thea sinesis
2. Coffea Arabica
3. Oryzasativa
4. Papaver Seminiferum

✅ Correct Answer: 4

PCR is test for:

1. HIV
2. Cancer
3. Tuberculosis
4. Cholera

✅ Correct Answer: 1

Following which is STD:

1. Typhoid
2. Cholera
3. Malaria
4. Syphilis

✅ Correct Answer: 4

Wuchereria bancrofti causes filaria in human being. It is of which group:

1. Protozoa
2. Bacteria
3. Virus
4. Helminth

✅ Correct Answer: 4

Which organ of body is most affected by excessive intake of alcohol?

1. Lungs
2. Liver
3. Stomach
4. Spleen

✅ Correct Answer: 2

Common cold is caused by:

1. Retro virus
2. Phage virus
3. Rhino virus
4. Sendai virus

✅ Correct Answer: 3

Which of the following is the cancer of blood?

1. Sarcoma
2. Lymphoms
3. Leukemia
4. None of these

✅ Correct Answer: 3

Gonorrhoea is caused by:

1. By Treponema pallidium
2. By Entamoeba gingivalis
3. By Mycobacterium taprae
4. By Neisseria gonorrhoeae

✅ Correct Answer: 4

Antigen-binding site in an antibody, is found between:

1. Two light chains
2. Two heavy chains
3. One heavy and one light chain
4. Either between two light chains or between one heavy and one light chain

✅ Correct Answer: 4

Alcohol is the most socially accepted narcotic drug. Excessive consumption of alcohol leads to:

1. Loss of memory
2. Live cirrhosis
3. State of hellucination
4. Suppresion of brain function

✅ Correct Answer: 2

Disease associated with secretion of toxin is:

1. TB
2. AIDS
3. Tetanus
4. Food Poisoning

✅ Correct Answer: 3

Widal test is done to confirm:

1. Malaria
2. Typhoid
3. AIDS
4. Cancer

✅ Correct Answer: 2

Which part of poppy plant yields opium:

1. Latex from unripe capsules
2. Dried roots
3. Dried leaves
4. Dired seeds

✅ Correct Answer: 1

Kala-azar is transmitted by:

1. By Sand fly
2. By Tsetse fly
3. By House fly
4. By Mosquitoes

✅ Correct Answer: 1

Memory cells are formed from:

1. Monocytes
2. Eosinophils
3. Neutrophils
4. Lymphocytes

✅ Correct Answer: 4

BCG vaccine is a preventive measure against:

1. Tuberculosis
2. Typhoid
3. AIDS
4. Cholera

✅ Correct Answer: 1

Antigens are present:

1. Inside nucleus
2. One the cell surface
3. Inside cytoplasm
4. On nuclear membrane

✅ Correct Answer: 2

The disease, tetanus also known as:

1. Shingles
2. Gangrene
3. Lockjaw
4. Whooping cough

✅ Correct Answer: 3

Man in the life-cycle of plasmodium is:

1. Primary host
2. Secondary host
3. Intemediate host
4. None of these

✅ Correct Answer: 2