12th class (Fsc) Biology unit 6 MCQs
chapter 6 MCQs 12th Class Biology
Chromosomes and DNA:
1. Chromosomal part which uncoils, during inter phase is called:
a. Chromatids
b. Euchromatin
c. Satellite DNA
d. Heterochromatin
2. Chromosomes appear inside the nucleus at the time of:
a. Cell maturation
b. Cell division
c. Cell differentiation
d. Cell Elongation
3. Morphological characteristics of chromosomes are collectively called:
a. Karyotype
b. Holotype
c. Neotype
d. Karyokinesis
4. Number of chromosomes in honey bee are:
a. 32
b. 06
c. 40
d. 20
5. The base pairs in human genome are:
a. Four billions
b. Two billions
c. Five billions
d. Three billions
6. The number of chromosomes in mouse is:
a. 26
b. 06
c. 40
d. 32
7. The particularly array of chromosomes that an individual possess is called its:
a. Karyotype
b. Genotype
c. Epistasis
d. Phenotype
8. Unlike most proteins, histones are ………:
a. Neutral
b. Positively charges
c. Discharged
d. Negatively charged
9. The highly condensed portion of the chromatin is called:
a. Nucleosome
b. Heterochromatin
c. Centromere
d. Euchromatin
10. In 1882, chromosomes ere first observed by:
a. Walter Fleming
b. John Brown
c. Walther Sutton
d. T.H. Morgan
11. V-shaped chromosomes are called:
a. Metacentric
b. Acrocentric
c. Sub metacentric
d. Telocentric
12. Walther Fleming first discovered chromosomes in the dividing cells of:
a. Insect Larvae
b. Frog Larvae
c. Salamander Larvae
d. Sea Urchin Larvae
13. How many million nucleotides are in DNA f typical human chromosome?
a. 180
b. 140
c. 200
d. 160
14. Number of histone protein molecules in a single nucleosome are:
a. 08
b. 06
c. 10
d. 09
15. Highly condensed portion of the chromatin are called;
a. Supercoils
b. Euchromatin
c. Centromeres
d. Hetero chromatin
16. The number of chromosomes in corn is:
a. 08
b. 06
c. 10
d. 09
17. A central role for chromosomes in heredity was first suggested in 1900 by:
a. T.H. Morgan
b. Karl correns
c. F. Griffiths
d. W.S. Sutton
18. Chromosomal theory of inheritance was first formulated by:
a. Carvin Bridges
b. Karl Correns
c. W. Sutton
d. T.H. Morgan
19. Transfer of genetic material from one cell to other that can alter the genetic make up of recipient cell is called:
a. Transcription
b. Transformation
c. Replication
d. Translation
20. DNA was discovered in:
a. 1961
b. 1869
c. 1971
d. 1864
21. Repeating units of DNA are called:
a. Nucleotides
b. Histones
c. Amino acids
d. Nucleosides
22. X-ray diffraction analysis of DNA was performed by:
a. Rosalind Franklin
b. Erwin Chargaff
c. Charles Darwin
d. Watson & Crick
23. Erwin Chargaff showed that the amount of guanine in DNA is always equal to:
a. Adenine
b. Cytosine
c. Uracil
d. Thymine
24. Nucleosome occurs at every:
a. 200 nucleotides
b. 2000 byckeitudes
c. 150 nucleotides
d. 1200 nucleotides
25. Each okazaki fragment is synthesized by:
a. DNA polymerase-II
b. DNA polymerase-I
c. DNA polymerase-IV
d. DNA polymerase-III