Chromosomes and DNA MCQs With Keys Unit 20 Fsc Biology

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
(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

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
(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)

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)

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
(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

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