Biology - 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
How many chromosome are present in Ascaris megalocephala?
- (a)
One
- (b)
Three
- (c)
Two
- (d)
None of these
Who discovered salivary gland chromosomes?
- (a)
Balbiani
- (b)
Waldeyer
- (c)
Du Praw
- (d)
Porter
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
Chromatid is
- (a)
One-half of chromosome
- (b)
haploid chromosome
- (c)
complete chromosome
- (d)
duplicate chromosome
Centromere is that part of chromosome where
- (a)
nucleoli are formed
- (b)
crossing over takes place
- (c)
chromatids are attached
- (d)
hicking occurs
A chromosome with sub-terminal centromere is
- (a)
acentric
- (b)
acrocentric
- (c)
metacentric
- (d)
telocentric
A chromosome with centromere near the middle is called
- (a)
metacentric
- (b)
sub-metacentric
- (c)
acrocentric
- (d)
telocentric
The lampbrush chromosomes are seen during which stage of meiotic division
- (a)
diplotene stage
- (b)
metaphase
- (c)
anaphase
- (d)
None of these
A row of dense granules present in Lampbrush chromosomes is known as
- (a)
chromomeres
- (b)
centromere
- (c)
chiasmata
- (d)
loops
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 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
Chromosomes which determine the sex of an individuals are called
- (a)
autosomes
- (b)
lysosomes
- (c)
heterosomes
- (d)
peroxysomes
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
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
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
Polytene chromosomes are
- (a)
unistranded
- (b)
bistranded
- (c)
multistranded
- (d)
None of these
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
Puffs are considered as
- (a)
active genes
- (b)
inactive genes
- (c)
regulatory genes
- (d)
promotory genes
M-chromosomes or minute chromosomes are found in which group of plants
- (a)
Algae
- (b)
Bryophyta
- (c)
Pteridophyta
- (d)
Gymnosperms
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