Zoology
The electron carries in the electron transport chain are:
A.
Coenzyme Q and cytochrome C
B.
Coenzyme Q and Ubiquinone
C.
Ubiquinone and cytochrome a
D.
Cytochrome a and Cytochrome C
Which is the correct sequence in biosynthesis of proteins in prokaryotic cell?
A.
Transcription => transfer of amino acid to protein synthesis formation site elongation => termination
B.
Transcription => polyribosome formation => transfer of amino acid to protein synthesis site => elongation => termination
C.
Transcription => transfer of amino acid to protein synthesis site => elongation polyribosome formation => termination
D.
Transcription => polyribosome formation => elongation => transfer of amino acid to protein synthesis site => termination
Which of the following is false with regard to lysosome?
A.
Lysosomal enzymes can cause chromosomal breakage
B.
Lysosomal breakdown initiates mitosis
C.
Lysosome are bound by a single unit membrane
D.
Lysosome form acrsome during spermiogenesis
Enzymes which breakdown compounds without the involvement of water are called:
A.
Oxidoreductases
B.
Lyases
C.
Ligases
D.
Hydrolases
The term feed-back refers to:
A.
The effect of substrate on the rate of enzymatic reaction
B.
The effect of end produce on the rate of enzymatic reaction
C.
The effect of enzyme concentration on its rate of reaction
D.
The effect of an external compound on the rate of enzymatic reaction
Enzymes generally:
A.
same pH and temperature optima
B.
Same pH but different temperature optima
C.
different pH but same temperature optima
D.
Different pH and different temperature optima
A coenzyme is:
A.
Always a protein
B.
Usually a metal
C.
Always an inorganic compound
D.
Usually a vitamin derivatives
In the plasma cells blood, the golgi complex secretes:
A.
Mucopolysaccharides
B.
Steroids
C.
Zymogens
D.
Immunoglobulins
The structure and appearance of ribosomes are dependent upon the amount of:
A.
Magnesium
B.
Potassium
C.
Sodium
D.
H+ ion
If a portion of the plasma membrane of a cell is destroyed:
A.
A new plasma membrane is formed
B.
The cell dies
C.
The cell goes on living without plasma membrane
D.
The rest of the plasma membrane is stretched to cover the damaged portion
If some RBCS are placed in a drop of 2.0% NaCl solution, The RBCs will:
A.
Lose colour
B.
Shrink and become wrinkled
C.
Swell up and finally burst
D.
Become sickle shaped
If a cell is placed in a drop of distilled water, it will:
A.
Shrink
B.
Swell
C.
First shrink and then swell
D.
Not show any change
The element present in maximum quantity in protoplasm is:
A.
Carbon
B.
Hydrogen
C.
Oxygen
D.
Nitrogen
The nucleolus is known as plasmasome when:
A.
It lacks a definite nucleolar membrane
B.
It is formed of oxychromatin
C.
It is formed of basichromatin
D.
It lacks chromatin
Endoplasmic reticulum is best developed in the cells of:
A.
Pancreas
B.
Eyes
C.
Nails
D.
Brain
The polytene chromosomes were discovered by:
A.
Balbiani
B.
Morgan
C.
Boveri
D.
Sutton
The absence of which of the following ions, can affect the life processes by lack of energy?
A.
Mg
B.
CO3
C.
PO4
D.
Cl
Which among the following cell organelles is not by a membrane?
A.
Lysosome
B.
Ribosome
C.
Pinosome
D.
Phagosome
Enzyme ATP is found in:
A.
F1 particles
B.
F0 particles
C.
Both in F1 and F0 particles
D.
Cytoplasm
Mitochondrial DNA, when compared to nuclear DNA is rich in_______ ratio:
A.
A-T
B.
A-G
C.
G-C
D.
C-A
Cristae in the mitochondria are the sites for:
A.
Oxidation - Reduction reactions
B.
Phosphorylation of flavoproteins
C.
Protein synthesis
D.
Breakdown of molecules
Nissl granules, myeloid bodies and sacroplasm of muscles are rich in:
A.
ER
B.
Fats
C.
Proteins
D.
Golgi bodies
Potentiality of any somatic cell to grow into a new complete organism is called:
A.
Parasexuality
B.
Totipotency
C.
Parthenogenesis
D.
Neoteny
Genophore is:
A.
A single molecule of double stranded DNA
B.
A single stranded DNA
C.
RNA + histone
D.
DNA + histone
Centrosome helps in:
A.
Providing site of cell division
B.
Inhibition of cell division
C.
Initiation of cell division
D.
Maturation of cells