Learning Mode - Zoology

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