CHAPTER NO-20
CHROMOSONE
& DNA
Topics:introduction,
types of chromosome, composition of chromosome, theory of inheritance, DNA as
hereditary material,
Total
Marks: 25 Time:
35 Mins
Q.1: Each
question has four possible answers. Select the correct answer: 7
|
1)
|
Structure
composed of eight histone proteins and coiled DNA duplex is called:
|
(a)nucleotide
|
(b)nucleoside
|
(c)nucleosome
|
(d)all
of these
|
|
2)
|
Role
of choromosome in heredity was first determined by :
|
(a)Karl
Correns
|
(b)Morgan
|
(c)Chargaff
|
(d)Franklin
|
|
3)
|
A
typical human chromosome contains nucleotudes:
|
(a)140
million
|
(b)1.4
x 108
|
(c)46
million
|
(d)both
a and b
|
|
4)
|
Number
of chromosomes in honeybee is:
|
(a)32
|
(b)40
|
(c)12
|
(d)46
|
|
5)
|
Positive
charge of histone proteins are due to amino acids named:
|
(a)arginine
|
(b)lysine
|
(c)valine
|
(d)both
a and b
|
|
6)
|
The
chromatin material which remains condensed throught is called:
|
(a)heterochromatin
|
(b)euchromatin
|
(c)chromatid
|
(d)centromere
|
|
7)
|
Particular
array of chromosomes that an individual possosses is called:
|
(a)karyokinesis
|
(b)cytokinesis
|
(c)karyotype
|
(d)homologue
|
Q.2: Write short answers of the following
questions? 7x2
= 14
- Explain the telocentric and sub metacentric shapes of chromosomes.
- Explain the structure of nucleosome.
- Define heterochromatin and euchromatin.
- Define transformation.
- Write down the chemical composition of chromosome.
- Describe the first evidence regarding DNA as hereditary material.
- Give the list of five living organisms with their chromosome.
Long Question
Q.3: Define transformation and give Chase Martha’s
evidence regarding transformation. (4)
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