Zoology
Mitosis and meiosis both takes place in:
A.
Small intestine
B.
Liver
C.
Testes
D.
Skin
One of the following sub stages may last upto menopause (in women) or death:
A.
Leptotene
B.
Pachytene
C.
Zygotene
D.
Diakinesis
The bridge or elongated body between the two centrioles is known as:
A.
Centrodesmus
B.
Continuous fibres
C.
Interzonal fibres
D.
All of these
When both the alleles of a locus are equally expressed, resulting in a phenotype which contains both the traits side by side it is called:
A.
Independent expression
B.
Codominance
C.
Incomplete dominance
D.
Complementary factor
Test cross is the:
A.
Cross between progeny and dominant parent
B.
Cross between progeny and recessive parent
C.
Cross between progeny and any of the parent
D.
None of these
When both the alleles are equally expressed in the hybrid forming an intermediate type, it is called:
A.
Complete dominance
B.
Codominance
C.
Incomplete dominance
D.
None of these
The most effective wave length of ultra violet light for inducing mutations is:
A.
2600 Å
B.
2300 Å
C.
2000 Å
D.
1800 Å
Interphase includes:
A.
G1
B.
S
C.
G2
D.
All of these
The gene for colour blindness in man is:
A.
Holandric
B.
X-linked
C.
Somatic
D.
None of these
Which of the following is known as bleeder's disease?
A.
Haemophilia
B.
Anhidrotic ectoderma
C.
Juvenile glaucoma
D.
None of these
Electron transport chain is found in:
A.
Endoplasmic reticulum
B.
Lysosome
C.
Mitochondria
D.
Nucleus
DNA molecules is composed of:
A.
Pentose sugar and phosphoric acid
B.
Pentose sugar, Phosphoric acid, pyrimidines and purines
C.
Pyrimidines and purines
D.
Pentose sugar, pyrimidines and purines
Endoplasmic reticulum is present in:
A.
Nucleus
B.
Nucleolus
C.
Cytoplasm
D.
All of these
The exchange of segments between maternal and parental chromosomes during meiosis is called:
A.
Linkage
B.
Crossing over
C.
Mutation
D.
None of these
Ribosomes are more in number in:
A.
Parenchymatous cells
B.
Epidermal cells
C.
Lignified cells
D.
Meristematic cells
The pairing of homologous chromosomes is known as:
A.
Crossing over
B.
Chiasma
C.
Synapsis
D.
None of these
In meiosis pairing of homologous chromosomes takes place at:
A.
Leptotene
B.
Zygotene
C.
Pachytene
D.
Diakinesis
Nucleolus is composed of:
A.
Ribosomal proteins
B.
tRNA
C.
Both (a) and (b)
D.
DNA
The function of cytoplasmic vacuoles is:
A.
Storage
B.
Transmission of materials
C.
Maintenance of the internal pressure of the cell
D.
All of these
Centrioles are derived from:
A.
Microtubules
B.
Centrosome
C.
Kinetosomes
D.
Cilia
The function of microtubules is:
A.
The transportation of water, ions etc.
B.
Cytoplasmic streaming
C.
The formation of asters
D.
All of these
Cells can recognise one another on the basis of their:
A.
Collodial index
B.
Enzymes they synthesis
C.
Membrane fluidity
D.
Glycolipids and glycoproteins
The golgi complex is not found in the ________ of man:
A.
R.B.C
B.
W.B.C
C.
Secretory cells
D.
All of these
Proteins which are embedded in the lipid layers of plasma membrane in a cell are called:
A.
Simple proteins
B.
Conjugated proteins
C.
Integral proteins
D.
Peripheral proteins
To which among the following is mitochondria related?
A.
Protein synthesis
B.
Yolk formation in developing ovum
C.
Acrosome formation
D.
Autolysis