ICSE XII/MCQ Questions for Class 12 Biology Set 3 Sample Test,Sample questions

Question:
A gamete contains which of the following :

1.Both alleles of a gene

2. Only one allele of a gene

3. Al allele of a gene

4. No allele


Question:
A point mutation is:

1. Thalassemia

2.Sickel-cell anaemia

3. Down’s syndrome

4.Nightblindness


Question:
A ribotide is made up of:

1. Ribose + Phosphate + Uracil

2. Deoxribose + Uracil + Phosphate

3. Thymine + Ribose + Phosphate

4.Deoxyribpse + Phosphate + Adenine


Question:
A strong mutagen is:

1. Cold

2.Heat

3.Water

4.X-rays


Question:
A true hybrid condition is:

1. tt Rr

2. Tt rr

3. tt rr

4. Tt Rr


Question:
Amino acid sequence, in protein synthesis is decided by the sequence of?

1.c-DNA

2.r-RNA

3.f-RNA

4. m-RNA


Question:
An lndividual with into identical alleles is:

1.Hybrid

2. Dominant

3. Homozygous

4.Heterozygous


Question:
An organism with two unlike genes of a trait is called :

1. Homozygous

2.Hetrozygous

3. Both of these

4. None of these


Question:
Anticodon found in:

1.On DNA

2. On t-RNA

3.On r-RNA

4. On m-RNA


Question:
Antiparallel strands of a DNA molecule means that:

1.One strand turns clockwise

2.One strand turns anticlockwise

3.The phosphate groups at the start of two DNA strands are in opposite position

4.The phosphate groups at the start of two DNA strands, at their ends, share the same position


Question:
Cause of chromosomal mutation:

1. Euploidy

2. Polyploidy

3. Physical effect

4. All of these


Question:
DNA fragments are joined in a correct sequence by :

1.DNA ligase

2. RNA polymerase

3.Helicase

4.DNA polymerase


Question:
DNA multiplication is also called:

1. Replication

2.Transduction

3. Translation

4. Transcription


Question:
DNA repairing is done by:

1. By DNA polymerase I

2. By DNA Polymerase II

3.Both (a) and (b)

4. By Ligase


Question:
Down’s syndrome is a:

1.Mendelian disorder

2. Chromosomal disorder

3.can be both

4. None of these


Question:
During DNA synthesis formed segment is:

1. Polymerase fragment

2. RNA fragment

3. Okazaki fragment

4.RNA Primer


Question:
During Protein synthesis, atone point the process comes to a halt. Select the group of the three codons from the following, from which any one of the three could bring about this halt:

1.UUC, UUA, UAC

2. UAG, UGA, UAA

3.UUE, UCA, UCG

4. UUU, UCC, UAU


Question:
During splicing axon attached and inducer enzyme for reaction:

1.RNA Ligase

2. RNA Catalase

3.RNA permease

4. RNA poloymerase


Question:
Exception of Mendel’s law is:

1.Dominance

2. Purity of gametes

3. Linkage

4. Independent assortment


Question:
Failure of segregation of chromatids during cell division Cycle result in the gain or loss of a cromosome (s) is called :

1.Female heterogamety

2. Male heterogamety

3.Aneuploidy

4.None of these


Question:
Female heterogamety is :

1.Two different types of gametes are produced by females

2. Four different types of gametes are produced by males

3.Can be both (a) and (b)

4.None of these


Question:
First geneticist/father of genetics was:

1.de Vries

2. Mendel

3. Darwin

4.Morgan


Question:
Following is important in Ïranscription:

1. DNA Methylase

2.CAAT Box

3.Promotar

4. DNA Polymerase


Question:
Genes located on V-chroinosome are:

1.Mutant genes

2. Autosomal genes

3. Holandric genes

4. Sex-linked genes


Question:
Gunetical identification of male human is:

1.By Nucleus

2. By cells

3.By Autosome

4. By Sex-chromosome


Question:
Haemophilia is a:

1. Mendelian disorder

2. Chromosomal disorder

3. Can be (a) or (b)

4.None of these


Question:
In a give DNA segment ATC ACC AGG ACC CCA ACA, the first base gets mutated. The effect of this on coding by the DNA segment will result in :

1. One amino acid less in protein

2.No change in the sequence

3.Complete change in the type and sequence of amino acid

4.Change in first amino acid only


Question:
In DNA helix:

1. Quadrate structure

2. Polarity

3.Antiparallel Polarity

4. Disuiphide bond


Question:
Mendal was born in:

1.17th century

2. 18th century

3. 19th century

4. 8th century


Question:
Mendal’s law can be applicable only when:

1.Characters are linked

2. Parents are pore breed

3.F1 generation in monohybrid cross show 2 type of individuals

4. Onepair of contiasting characters depends on another pair


Question:
Mendel published his work on inheritance of character in?

1.1870

2.1900

3. 1865

4. 1845


Question:
Mendel worked on :

1.Edible pea

2. Wild pea

3.Garden Pea

4. None of these


Question:
Mendel’s formulated the law of purity of gametes on the basis of:

1.Test cross

2.Back cross

3. Monohybrid cross

4. Dihybrid cross


Question:
Mendel’s laws were discovered by:

1. Correns

2. Shermak

3. de meris

4.All of these


Question:
Mendel’s second law is of the law of:

1. Segregation

2. Dominance

3. Polygenic inheritance

4.Independent assortment


Question:
Most of the mutations are:

1. Recessive

2.Harmful

3.Germinal

4.All of these


Question:
Name the scientist who discovered the law of Heredity :

1. Gregor Mendel

2.Newton

3.Piinnett

4.None of these


Question:
One turn of the helix in p-from DNA is approximately:

1.20 Ã…

2. 2 nm

3. 20 nm

4. 34 nm


Question:
Punnett square was developed by:

1. Mendel

2. Watson and Sutton

3. Raginald

4. Boveri


Question:
Represser Lac-Operon protein attached to:

1. Operator

2. Inducer

3. Regulator

4.β-Glacto sidase


Question:
Rh+ individual gene may be:

1. rr

2. TT

3. Rr

4.Both (a) and (c)


Question:
Smallest segment of genetic material affected by mutation is :

1.Recon

2. Cistron

3.Muton

4. Exon


Question:
The allele which is unable to express its effect in the presence of another is called :

1.Co-dominant

2. Supplementary

3.Complementary

4.Recessive


Question:
the enzyme involved in transcription is:

1. DNA Polymerase I

2. DNA Polymerase II

3. RNA Polymerase

4. DNA Polymerase


Question:
The plant Mendel used to study inheritance of two genes is:

1. Apple

2. Mango

3. Garden pea

4. Potato


Question:
The ratio constant for a species is :

1. T+C/G + A

2.A+C/T + G

3. G + G/A + T

4.A + C/C + T


Question:
tt mates with Tt. What will be characteristic of offspring:

1. 75% Ineffective

2. 50% Uneffective

3. 25% Uneffective

4.All Effective


Question:
Two genes very close on a chromosome will show:

1.No crossing over

2. High crossing over

3.Hardly an crossing over

4. Only double crossing overy


Question:
Which one is mainly transcribed:

1.Only RNA sequence

2. Middle repetitive DNA sequence

3. Highly repetitive DNA sequence

4.Single copy of DNA sequence


Question:
Who introduced Chromosomal Theory of Inheritance?

1. Mendel

2.Sutton

3.Reginald

4.Boveri


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