Chromosomes
Exam Duration: 45 Mins Total Questions : 30
Who coined the term chromosome for the first time?
- (a)
Waldeyer
- (b)
Du Praw
- (c)
Bon Baer
- (d)
se Vries
The chromosomes those lack centromere are known as
- (a)
acentric
- (b)
metacentric
- (c)
submetacentric
- (d)
holocentric
Salivary gland chromosomes are also known as
- (a)
polytene chromosomes
- (b)
L-chromosomes
- (c)
lampbrush chromosomes
- (d)
autosomes
Dark stained regions in the polytene chromosomes are known as
- (a)
interbands
- (b)
bands
- (c)
chiasmata
- (d)
puffs
The animal in which Lampbrush chromosomes were first observed was
- (a)
amphibian
- (b)
mammals
- (c)
reptiles
- (d)
rodents
A giant chromosome with a number of chromonemata is
- (a)
lampbrush chromosome
- (b)
supernumerary chromosome
- (c)
polytene chromosome
- (d)
heterochromosome
A chromosome with centromere near the middle is called
- (a)
metacentric
- (b)
sub-metacentric
- (c)
acrocentric
- (d)
telocentric
For karyotyping, the cells can be taken from
- (a)
white blood cells
- (b)
amniotic cells
- (c)
bone marrow
- (d)
All of these
The organs of dipterans from where polytene chromosomes have been reported
- (a)
gut epithelium
- (b)
Malpighian
- (c)
fat bodies
- (d)
All of these
A row of dense granules present in Lampbrush chromosomes is known as
- (a)
chromomeres
- (b)
centromere
- (c)
chiasmata
- (d)
loops
Chromosomes were first seen as nuclear filaments in pollen mother cells of
- (a)
Tradescantia
- (b)
Mango
- (c)
Cycas
- (d)
Pinus
Non-stainable region of a chromosome is known as
- (a)
centromere
- (b)
primary constriction
- (c)
Both (a) and (b)
- (d)
secondary construction
The number of chromosomes present in gametes is
- (a)
half the number of chromosomes found in zygote
- (b)
triple the number of chromosomes found in zygote
- (c)
double the number of chromosomes found in zygote
- (d)
1/4 th the number of chromosomes found in zygote
The covering or sheath of chromosomes is known as
- (a)
pellicle
- (b)
membrane
- (c)
matrix
- (d)
None of these
Human beings share banding pattern of chromosomes with
- (a)
milch animals
- (b)
domesticated animals
- (c)
primates
- (d)
carnivorous mammals
Organisms with large number of chromosomes are
- (a)
polyploid
- (b)
haploid
- (c)
diploid
- (d)
tetraploid
In plants maximum number of chromosomes (2n = 1262) are found in
- (a)
Ophioglossum reticulatum
- (b)
Haplopappus gracillus
- (c)
Saccharum officinarum
- (d)
None of the above
Autosome is
- (a)
achromatic chromosome
- (b)
idiosome
- (c)
a chromosomes other than sex-chromosomes
- (d)
allosome
An angiospermic plant with minimum number of chromosomes is
- (a)
Haplopappus gracilis
- (b)
Ophiologissum reticulatum
- (c)
Asparagus ramosus
- (d)
Pisum sativum
Which of the following statement is incorrect regarding the band region of polytene chromosome
- (a)
feulgen negative area
- (b)
absorb ultraviolet light at 2600\(\mathring { A } \)
- (c)
chromonemata is tightly packed
- (d)
stain intensely with basic stains
Which group in Denver system has maximum number of chromosomes?
- (a)
Group A
- (b)
Group B
- (c)
Group C
- (d)
Group D
Centromere is a part of
- (a)
ribosomes
- (b)
chromosome
- (c)
mitochondria
- (d)
endoplasmic reticulum
Telomere repetitive DNA sequence control the function of eukaryotic chromosome, because they
- (a)
act as replicans
- (b)
are RNA transcription factor
- (c)
help chromosome pairing
- (d)
prevent chromosome loss
Histone octamer contains
- (a)
eight types of histones
- (b)
eight histones of four different types
- (c)
five histones
- (d)
six types of histones
B-chromosome is also known as
- (a)
somatic chromosome
- (b)
mega chromosome
- (c)
limited chromosome
- (d)
supernumerary chromosome
When centromere is present at one end, the chromosome is
- (a)
metacentric
- (b)
acrocentric
- (c)
telocentric
- (d)
apocentric
When the chromosome has a centromere nearer to one end of the chromosome resulting into one shorter and one longer arm, the chromosome is termed as
- (a)
metacentric
- (b)
submetacentric
- (c)
acrocentric
- (d)
telocentric
The terms S and E stands for
- (a)
somatic
- (b)
eliminative
- (c)
Both (a) and (b)
- (d)
elbow
M-chromosomes or minute chromosomes are found in which group of plants
- (a)
Algae
- (b)
Bryophyta
- (c)
Pteridophyta
- (d)
Gymnosperms
The puffs of polytene chromosomes contain large amount of
- (a)
mRNA
- (b)
tRNA
- (c)
rRNA
- (d)
DNA
1675494153.jpg)
1675329406.jpg)
1652956171.jpg)
