Chromosomes and DNA MCQs With answer keys. All MCQs are taken from past papers. Fsc Biology Unit wise fully solved MCQs Unit 20. These multiple-choice questions are from all Punjab Boards’ previous papers.
Chromosomes and DNA MCQs
Fsc Biology 12th class fully solved MCQs of chromosomes and DNA chapter 20. (From Previous Board Papers 2014-2015-2016-2017-2018).
The chromosomal part which uncoils, during interphase is called: (MLX.GI. 2016)
(A) Euchromatin
(B) Heterochromatin
(C) Chromatids
(D) Satellite DNA
Chromosomes appear inside the nucleus at the time of: (SGD. GI, 2016)
(A) Cell division
(B) Cell Elongation
(C) Cell maturation
(D) Cell differentiation
Morphological Characteristics of Chromosomes are collectively called: (LNIR. GI, 2014)
(4) Holotype
(B) Karyokinesis
(C) Karyotype
(D) Neotype
Number of chromosomes in Honey bee are: (LJIR. GI, 2014)
(A) 06
(B) 20
(C) 32
(D) 40
The base pairs in the human genome are: (GRW, GI, 2014)
(A) Two billion
(B) Three billion
(C) Four billion
(D) Five billion
The number of chromosomes in mouse is: (FBD. GI, 2014)
(A) 05
(B) 32
(C) 26
(D) 40
The particular array of chromosomes that an individual possess is called its: (DGK GII, 2014%DGK. GII, MLS, GI, SGD. GI, 2015)(SWL. GI, DGK, GI, 2016) (RWP. 2018)
(A) Genotype
(B) Phenotype
(C) Karyotype
(D) Epistasis
Unlike most proteins, histones are (GWR. GII, 2015)
A Positively charges
(B) Negatively charged
(C)Neutral
(D) Discharged
The highly condensed portion of the chromatin is called: (AJK. GI, 2015)
A Heterochromatin
(B) Euchromatin
(C) Nucleosome
(D) Centromere
In 1882. Chromosomes were first observed by: (LIIR. GI, MLN. GI, 2017)
(A) John Brown
(B) T.H. Morgan
(C) Walter Fleming
(D) Walther Sutton
V-shaped chromosomes are called: (GRW. GI, 2017)
(A) Acrocentric
(B) Telocentric
(C) Metacentric
(D) Sub metacentric
A central role for chromosomes in heredity was first suggested in 1900 by: (LIR. GI, 2016)
(A) Karl correns
B) W.S. Sutton
(C) T.H. Morgan
(D) F. Griffiths
Unit 20 additional MCQs
Walther Fleming first discovered chromosomes in the dividing cells of: (DGK. GI, 2014)
(A) Frog Larvae
(B) Sea Urchin Larvae
(C) Insect Larvae
(D) Salamander Larvae
DNA was discovered in: (RWP. GI, 2016)
(A) 1869
(B) 1864
(C) 1961
(D) 1971
Repeating units of DNA are called: (GRW.GI, 2014)
(A) Histones
(B) Nucleosides
(C) Nucleotides
(D) Amino Acids
X-ray diffraction analysis of DNA was performed by: (LIIR. GI, 2015)
(A) Erwin Chargaff
(B) Watson & Crick
(C) Rosalind Franklin
(D) Charles Darwin
How many million nucleotides are in the DNA of a typical human chromosome? (BWP. GI, 2017)
(A) 140
(B) 160
(C) 180
(D) 200
The strand which elongates towards the replication fork is: AGRW.G.1.2016)
(A) Leading
(B) Okazaki
(D) Primer
In 1953, F.Sanger described the sequence of Amino Acids of:
(A) Myoglobin
(B) Keratin
C Insulin
(D) Globulin
A strand of DNA, which is transcribed is called:
(A)Coding strand
(B) Sense strand
(C) Antisense strand
(D) Conservative strand
Human cells contain types of tRNA molecules:
(A) 20
(B) 45
(C) 193
(D) 300
RNA polymerase II synthesizes: (DGR. GII, 2015)
(A) mRNA
(B) tRNA
(C) rRNA
(D) CDNA
The copping of mRNA from DNA is called:(SGD). GI.2017)
(A) Translation
(1) Transduction
(C) Transformation
D) Transcription
Anti codes present on: (SGI), GI. AJK, GI.2017)
(A) mRNA
(B) tRNA
(C) DNA
(D) rRNA
The amino acid attachment site of IRNA is: (LIIR. GI. 2017)
(A) G-end
(B) 2-end
C) 3′-end
(D) S-end
Which of the following is a “Start” codon? (LIIR. GII, 2016)
(A) AUG
(B) UAA
(C) UAG
(D) UGA
Every gene starts with initiation codon AUG which encodes for the amino acid: (AJK. G1, 2016)
(A) Lysine
(B) Serine
(C) Proline
(D) Methionine
One of the given does not code for any amino acid: (BWP. GI. 2015)
(A) AUG
(B) ACU
(C) GAU
(D) UAA
This condition appears as a result of point mutation: (FBD, GI, 2016)
(A) Down Syndrome
(B) Turner Syndrome
(C) Klinefelter Syndrome
(D) Sickel Cell Anaemia
In bacteria the newly synthesized mRNA is released in:
(A) Nucleus
(B) Cytoplasm
(C) Mitochondria
(D) Nucleolus
The number of histone protein molecules in a single nucleosome are:
(A) 06
(B) 09
(C) 08
(D) 10
If the alternations involve only one or a few base pairs in the coding sequence they are
called:
(A) Mutation
(B) Point mutation
(C) Deletion
(D) Inversion
DNA polymerase only adds nucleotides to the end:
(A) 5′-end
(B) 3′-end
(C) 2′ – end
(D) 4′. end
Each Okazaki fragment is synthesized by:
(A) DNA polymerase-1
(B) DNA polymerase-II
(C) DNA polymerase-III
(D) DNA polymerase-IV
Erwin chargaff showed that the amount of guanine in DNA is always equal to:
(A) Cytosine
(B) Thymine
(C) Adenine
(D) Uracil
Nucleosome occurs at every:
(A) 2000 byckeitudes
(B) 1200 nucleotides
(C) 200 nucleotides
(D) 150 nucleotides
Which of the following polymerase synthesize tRNA? (LIIR. GI, 2018)
(A) RNA polymerase-1
(B) RNA polymerase- 11
(C) RNA polymerase – III
(D) DNA polymerase
Highly condensed portions of the chromatin are called: (GRW.2018)
(A) euchromatin
(B) hetero chromatin
(C) supercoils
(D) centromeres
In sickle cell anemia code for glutamic acid is replaced by: (MLN. 2018)
(A) Leucine
(B) Histidine
(C) Valine
(D) Proline