Biology - Chromosomes
Exam Duration: 45 Mins Total Questions : 30
Sex chromosomes are also known as
- (a)
heterosomes
- (b)
somatic chromosomes
- (c)
giant chromosomes
- (d)
polytene chromosomes
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
Puffs of polytene chromosomes are also known as
- (a)
Balbiani rings
- (b)
bands
- (c)
chiasmata
- (d)
None of these
The animal in which Lampbrush chromosomes were first observed was
- (a)
amphibian
- (b)
mammals
- (c)
reptiles
- (d)
rodents
For karyotyping, the cells can be taken from
- (a)
white blood cells
- (b)
amniotic cells
- (c)
bone marrow
- (d)
All of these
The length of the polytene chromosome can be upto
- (a)
1000\(\mu\)
- (b)
1200\(\mu\)
- (c)
1500\(\mu\)
- (d)
None of these
The lampbrush chromosomes are seen during which stage of meiotic division
- (a)
diplotene stage
- (b)
metaphase
- (c)
anaphase
- (d)
None of these
Idio chromosomes is the name given to
- (a)
allosome
- (b)
sex-chromosomes
- (c)
Both (a) and (b)
- (d)
secondary constriction
Chemically the chromosomes consists of
- (a)
histone proteins
- (b)
non-histone proteins
- (c)
DNA
- (d)
All of these
Non-stainable region of a chromosome is known as
- (a)
centromere
- (b)
primary constriction
- (c)
Both (a) and (b)
- (d)
secondary construction
Histone proteins are rich in amino acids
- (a)
lysine
- (b)
arginine
- (c)
Both (a) and (b)
- (d)
proline
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
Chromosomes which determine the sex of an individuals are called
- (a)
autosomes
- (b)
lysosomes
- (c)
heterosomes
- (d)
peroxysomes
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
In the Denver system, sex-chromosomes are placed in group
- (a)
A
- (b)
B
- (c)
D
- (d)
None of these
There are seven groups of autosomal chromosomes according to Denver (Colorado). Convention, 1960. It is according to size of chromosomes and position of centromere, which has acrocentric chromosome?
- (a)
Group B
- (b)
Group D
- (c)
Group C
- (d)
Group F
Telomeres prevents the attachment of one chromosomes to
- (a)
other chromosomes
- (b)
nuclear envelope
- (c)
nucleolus
- (d)
All of these
Centromere is a part of
- (a)
ribosomes
- (b)
chromosome
- (c)
mitochondria
- (d)
endoplasmic reticulum
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
Puffs are considered as
- (a)
active genes
- (b)
inactive genes
- (c)
regulatory genes
- (d)
promotory genes
Balbiani rings of polytene chromosomes are the site of
- (a)
RNA synthesis
- (b)
DNA synthesis
- (c)
DNA replication
- (d)
protein synthesis
The terms S and E stands for
- (a)
somatic
- (b)
eliminative
- (c)
Both (a) and (b)
- (d)
elbow
The arrangements of chromosomes in the order of their decreasing lengths is known as
- (a)
idiogram
- (b)
karyotype
- (c)
karyogram
- (d)
abnormal karyotype