Zoology
Cell theory was proposed by:
A.
Boveri
B.
Schleiden and Schwann
C.
Sutton
D.
Punnet
The number and concentration of ribosomes in a cell depends on the:
A.
RNA contents of cell
B.
DNA contents of cell
C.
Cytoplasmic contents
D.
Protein synthetic activity
The adjacent cells in an organised tissue are interconnected by:
A.
Tight junctions
B.
Desmosomes
C.
Junctional channels
D.
Zonula adherence
Functions of nucleolus in a nucleus are:
A.
Synthesis of DNA
B.
Synthesis of RNA
C.
Biogenesis of ribosomes, synthesis and secretion of RNA and proteins
D.
None of these
To which among the following in mitochondria related?
A.
Protein synthesis
B.
Yolk formation in developing ovum
C.
Acrosome formation
D.
Autolysis
The chromosome with sub-terminal centromere is known as:
A.
Acrocentric
B.
Telocentric
C.
Sub-metacentric
D.
Metacentric
The haploid set of chromosomes is also known as the:
A.
Cistron
B.
Gene
C.
Genome
D.
Monoploid
Protein synthesis takes place in the:
A.
Mitochondria
B.
Endoplasmic reticulum
C.
Golgi complex
D.
Centriole
"Active transport" in a cell:
A.
Release energy
B.
Requires energy
C.
Produces toxic substances
D.
Does not take place
The number of nuclei in a cell:
A.
Is strictly one
B.
May be one or three
C.
Depends on the extent of cellular activity
D.
Is generally one, but in some animals such as Paramecium, Amoeba or Opalina it may be one, two or more than two
The non-living structures, suspended in the cytoplasm are called:
A.
Cell-organelles
B.
Cell-inclusions
C.
Both (a) and (b)
D.
None of these
The 80S ribosomes contain three types of rRNA, they are:
A.
28S, 18S and 16S
B.
23S,18S and 5S
C.
28S, 18S and 9S
D.
28S, 18S and 5S
Which among the following statements is incorrect?
A.
Ribosomes occur only in eukaryotic cells
B.
Erythroblasts, developing muscle cells etc. ,contain large numbers of free ribosomes
C.
The ribosomes remain attached with the membranes of E.R. in the cells where active protein synthesis takes place
D.
In ribosomes, amino acids are assembled in a specific sequence to produce a polypeptide chain
The microtubules of centrioles and basal bodies contain the structural protein:
A.
Tubulin
B.
Myelin
C.
Lysin
D.
None of these
The bacterial cells resemble the:
A.
Mitochondria
B.
Endoplasmic reticulum
C.
Golgi bodies
D.
Lysosomes
The ultimate respiratory organs of an organism are:
A.
Lungs
B.
Alveoli
C.
Mitochondria
D.
Gills
Which among the following forms the main bulk of plasma membrane?
A.
Carbohydrates
B.
Proteins
C.
Lipids
D.
None of these
Minute evagination of the plasma membrane from the free surface of cells are known as:
A.
Desmosomes
B.
Interdigitation
C.
Microvilli
D.
Tonofibrils
The process of ingestion of fluid materials by the cell through the plasma membrane is known as:
A.
Pinocytosis
B.
Rhopheocytosis
C.
Phagocytosis
D.
None of these
The fluid mosaic model of the cell membrane was proposed by:
A.
Hilleir and Hoffman
B.
Harvey and Danielli
C.
Singer and Nicolson
D.
Danielli and Davson
Which of the following is not seen in animal cells?
A.
Peroxisomes
B.
Glyoxysomes
C.
Phagosomes
D.
Endosomes
The lipid layers in the plasma membrane remain linked to each other by their:
A.
Polar ends which are hydrophobic
B.
Non-polar ends which are hydrophillic
C.
Polar ends which are hydrophillic
D.
Non-polar ends which are hydrophobic
The external covering of an animal cell is known as:
A.
Plasmalemma
B.
Cell wall
C.
Semipermeable membrane
D.
All of these
Who among the following got the Nobel prize in decoding the language of "bee dances"?
A.
Ernest Spytzer
B.
Karl Von Frisch
C.
Mayer
D.
Wagner
The drones of honey bee are:
A.
Fertile male
B.
Fertile female
C.
Sterile male
D.
Sterile female