Biology - Chromosomes
Exam Duration: 45 Mins Total Questions : 30
The lowest haploid chromosome number among eukaryotes is present in
- (a)
Drosophila
- (b)
Myrmecia pilosula
- (c)
Chironomus
- (d)
Salamander
Sex chromosomes are also known as
- (a)
heterosomes
- (b)
somatic chromosomes
- (c)
giant chromosomes
- (d)
polytene chromosomes
The tips of chromosomes are also known as
- (a)
telomeres
- (b)
centromere
- (c)
chromomere
- (d)
None of these
Salivary gland chromosomes are also known as
- (a)
polytene chromosomes
- (b)
L-chromosomes
- (c)
lampbrush chromosomes
- (d)
autosomes
Who discovered salivary gland chromosomes?
- (a)
Balbiani
- (b)
Waldeyer
- (c)
Du Praw
- (d)
Porter
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
Chromosomes were first seen by
- (a)
Hofmeister
- (b)
Waldeyer
- (c)
Strasburger
- (d)
Flrmming
Chromatid is
- (a)
One-half of chromosome
- (b)
haploid chromosome
- (c)
complete chromosome
- (d)
duplicate chromosome
A chromosome with sub-terminal centromere is
- (a)
acentric
- (b)
acrocentric
- (c)
metacentric
- (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 lampbrush chromosomes are seen during which stage of meiotic division
- (a)
diplotene stage
- (b)
metaphase
- (c)
anaphase
- (d)
None of these
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
Histone proteins are rich in amino acids
- (a)
lysine
- (b)
arginine
- (c)
Both (a) and (b)
- (d)
proline
Human beings share banding pattern of chromosomes with
- (a)
milch animals
- (b)
domesticated animals
- (c)
primates
- (d)
carnivorous mammals
Chromosomes which determine the sex of an individuals are called
- (a)
autosomes
- (b)
lysosomes
- (c)
heterosomes
- (d)
peroxysomes
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
Which group in Denver system has maximum number of chromosomes?
- (a)
Group A
- (b)
Group B
- (c)
Group C
- (d)
Group D
Polytene chromosomes are
- (a)
unistranded
- (b)
bistranded
- (c)
multistranded
- (d)
None of these
Telomeres prevents the attachment of one chromosomes to
- (a)
other chromosomes
- (b)
nuclear envelope
- (c)
nucleolus
- (d)
All of these
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
M-chromosomes or minute chromosomes are found in which group of plants
- (a)
Algae
- (b)
Bryophyta
- (c)
Pteridophyta
- (d)
Gymnosperms
The another name for centromere is
- (a)
primary construction
- (b)
secondary
- (c)
additional constriction
- (d)
tertiary constriction
The puffs of polytene chromosomes contain large amount of
- (a)
mRNA
- (b)
tRNA
- (c)
rRNA
- (d)
DNA