ICSE%20XII/MCQ%20Questions%20for%20Class%2012%20Biology%20Set%203 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

Posted Date:-2022-09-22 16:39:03


Question:
A point mutation is:

1. Thalassemia

2.Sickel-cell anaemia

3. Down’s syndrome

4.Nightblindness

Posted Date:-2022-09-22 16:15:51


Question:
A ribotide is made up of:

1. Ribose + Phosphate + Uracil

2. Deoxribose + Uracil + Phosphate

3. Thymine + Ribose + Phosphate

4.Deoxyribpse + Phosphate + Adenine

Posted Date:-2022-09-22 16:49:40


Question:
A strong mutagen is:

1. Cold

2.Heat

3.Water

4.X-rays

Posted Date:-2022-09-22 16:15:11


Question:
A true hybrid condition is:

1. tt Rr

2. Tt rr

3. tt rr

4. Tt Rr

Posted Date:-2022-09-21 17:16:41


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

Posted Date:-2022-09-22 16:52:16


Question:
An lndividual with into identical alleles is:

1.Hybrid

2. Dominant

3. Homozygous

4.Heterozygous

Posted Date:-2022-09-21 17:15:34


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

1. Homozygous

2.Hetrozygous

3. Both of these

4. None of these

Posted Date:-2022-09-22 16:17:08


Question:
Anticodon found in:

1.On DNA

2. On t-RNA

3.On r-RNA

4. On m-RNA

Posted Date:-2022-09-22 16:44:35


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

Posted Date:-2022-09-22 16:51:06


Question:
Cause of chromosomal mutation:

1. Euploidy

2. Polyploidy

3. Physical effect

4. All of these

Posted Date:-2022-09-21 17:11:47


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

1.DNA ligase

2. RNA polymerase

3.Helicase

4.DNA polymerase

Posted Date:-2022-09-22 16:47:37


Question:
DNA multiplication is also called:

1. Replication

2.Transduction

3. Translation

4. Transcription

Posted Date:-2022-09-22 16:52:48


Question:
DNA repairing is done by:

1. By DNA polymerase I

2. By DNA Polymerase II

3.Both (a) and (b)

4. By Ligase

Posted Date:-2022-09-22 16:49:02


Question:
Down’s syndrome is a:

1.Mendelian disorder

2. Chromosomal disorder

3.can be both

4. None of these

Posted Date:-2022-09-22 16:37:55


Question:
During DNA synthesis formed segment is:

1. Polymerase fragment

2. RNA fragment

3. Okazaki fragment

4.RNA Primer

Posted Date:-2022-09-22 16:46:19


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

Posted Date:-2022-09-22 16:53:28


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

1.RNA Ligase

2. RNA Catalase

3.RNA permease

4. RNA poloymerase

Posted Date:-2022-09-22 16:45:46


Question:
Exception of Mendel’s law is:

1.Dominance

2. Purity of gametes

3. Linkage

4. Independent assortment

Posted Date:-2022-09-22 16:31:22


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

Posted Date:-2022-09-22 16:30:23


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

Posted Date:-2022-09-22 16:42:37


Question:
First geneticist/father of genetics was:

1.de Vries

2. Mendel

3. Darwin

4.Morgan

Posted Date:-2022-09-21 17:13:39


Question:
Following is important in Ïranscription:

1. DNA Methylase

2.CAAT Box

3.Promotar

4. DNA Polymerase

Posted Date:-2022-09-22 16:44:05


Question:
Genes located on V-chroinosome are:

1.Mutant genes

2. Autosomal genes

3. Holandric genes

4. Sex-linked genes

Posted Date:-2022-09-22 16:14:38


Question:
Gunetical identification of male human is:

1.By Nucleus

2. By cells

3.By Autosome

4. By Sex-chromosome

Posted Date:-2022-09-21 17:10:32


Question:
Haemophilia is a:

1. Mendelian disorder

2. Chromosomal disorder

3. Can be (a) or (b)

4.None of these

Posted Date:-2022-09-22 16:32:04


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

Posted Date:-2022-09-22 16:47:04


Question:
In DNA helix:

1. Quadrate structure

2. Polarity

3.Antiparallel Polarity

4. Disuiphide bond

Posted Date:-2022-09-22 16:45:12


Question:
Mendal was born in:

1.17th century

2. 18th century

3. 19th century

4. 8th century

Posted Date:-2022-09-21 17:12:18


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

Posted Date:-2022-09-21 17:16:10


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

1.1870

2.1900

3. 1865

4. 1845

Posted Date:-2022-09-22 16:41:57


Question:
Mendel worked on :

1.Edible pea

2. Wild pea

3.Garden Pea

4. None of these

Posted Date:-2022-09-22 16:38:29


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

Posted Date:-2022-09-22 16:26:17


Question:
Mendel’s laws were discovered by:

1. Correns

2. Shermak

3. de meris

4.All of these

Posted Date:-2022-09-22 16:25:34


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

1. Segregation

2. Dominance

3. Polygenic inheritance

4.Independent assortment

Posted Date:-2022-09-22 16:16:27


Question:
Most of the mutations are:

1. Recessive

2.Harmful

3.Germinal

4.All of these

Posted Date:-2022-09-21 17:17:43


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

1. Gregor Mendel

2.Newton

3.Piinnett

4.None of these

Posted Date:-2022-09-22 16:39:38


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

1.20 Ã…

2. 2 nm

3. 20 nm

4. 34 nm

Posted Date:-2022-09-22 16:53:59


Question:
Punnett square was developed by:

1. Mendel

2. Watson and Sutton

3. Raginald

4. Boveri

Posted Date:-2022-09-22 16:40:11


Question:
Represser Lac-Operon protein attached to:

1. Operator

2. Inducer

3. Regulator

4.β-Glacto sidase

Posted Date:-2022-09-22 16:43:32


Question:
Rh+ individual gene may be:

1. rr

2. TT

3. Rr

4.Both (a) and (c)

Posted Date:-2022-09-21 17:11:07


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

1.Recon

2. Cistron

3.Muton

4. Exon

Posted Date:-2022-09-21 17:18:12


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

Posted Date:-2022-09-21 17:17:13


Question:
the enzyme involved in transcription is:

1. DNA Polymerase I

2. DNA Polymerase II

3. RNA Polymerase

4. DNA Polymerase

Posted Date:-2022-09-22 16:50:17


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

1. Apple

2. Mango

3. Garden pea

4. Potato

Posted Date:-2022-09-22 16:41:25


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

Posted Date:-2022-09-22 16:48:23


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

1. 75% Ineffective

2. 50% Uneffective

3. 25% Uneffective

4.All Effective

Posted Date:-2022-09-22 16:29:46


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

Posted Date:-2022-09-21 17:12:51


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

Posted Date:-2022-09-22 16:51:42


Question:
Who introduced Chromosomal Theory of Inheritance?

1. Mendel

2.Sutton

3.Reginald

4.Boveri

Posted Date:-2022-09-22 16:40:54


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