Zoology
An organism which has lost a pair of chromosome is termed:
A.
Monosomic
B.
Nullisomic
C.
Haploid
D.
Euploid
The enzymes found in chromosomes are:
A.
DNA polymerase
B.
RNA polymerase
C.
DPN-pyrophosphorylase and nucleoside triphosphatase
D.
All of these
Heterochromatin, a type of chromatin material contains:
A.
Large amount of DNA only
B.
Both RNA and DNA in equal amounts
C.
Small amount of DNA and large amount of RNA
D.
Varying composition of DNA and RNA
In bacterial cells, the biogenesis of ribosomes takes place in the:
A.
Nucleus
B.
Endoplasmic reticulum
C.
Cytoplasm
D.
Does not take place
The 70S ribosome consist of two subunits:
A.
50S and 30S
B.
50S and 20S
C.
60S and 40S
D.
35S and 40S
Which among the following statements is wrong?
A.
The flagella are less in number than cilia in a cell
B.
The flagella are longer processes while cilia are short
C.
The flagella move in a sweeping stroke while cilia exhibit undulatory motion
D.
The flagella beat independently, while the cilia beat in a co-ordinated rhythm
In the cell, the ribosomal RNA is synthesized in the nucleoli and:
A.
Most of it passes out into the cytoplasm
B.
Always remains in the nucleoli
C.
At once leaves the nucleus
D.
Remains attached to the DNA
The chromatin of chromosomes resolves itself into following major molecules. They are:
A.
Histone, protamine, DNA and RNA
B.
Proteins, nucleic acids and Kinetochore
C.
Histamine, protamine, DNA and RNA
D.
Histone and kinetochore
In the process of protein synthesis in a cell, the chromosomal DNA:
A.
Does not take part directly
B.
Becomes inactive
C.
Undergoes replication
D.
Serves as a template for synthesis of RNA
When a sugar molecule is linked to a phosphate and a nitrogen base, the new molecule formed is called:
A.
Nucleoside
B.
Nucleotide
C.
Nucleic acids
D.
None of these
In each strand of DNA, the sugar phosphate units form the outer backbone and bases turn inwards. The two strands are joined together by their bases through:
A.
Strong polar bonds
B.
Weak Vanderwall's force
C.
Strong ionic bonds
D.
Weak hydrogen bonds
Nucleolar organizer is:
A.
The cell organelle which is responsible for organization of nucleolus
B.
The DNA present in nucleolus
C.
The RNA possessing the base composition complimentary to that of DNA of the nucleolus
D.
The parts of a homologous pair of chromosomes in touch with nucleolus
Which one of the following is not a pyrimidine base?
A.
Adenine
B.
Thymine
C.
Cytosine
D.
Uracil
Water forms the bulk of protoplasm, the other compounds present in the protoplasm in their decreasing constituent quantity are:
A.
Lipids, Carbohydrates, Proteins
B.
Proteins, Carbohydrates, Lipids
C.
Proteins, Lipids, Carbohydrates
D.
Lipids, Proteins, Carbohydrates
The nucleoplasm mainly consists of:
A.
Phosphorus and ribose sugars
B.
Ribose sugars and proteins
C.
Nucleotides and nucleic acids
D.
Phosphorus, ribose sugar, proteins, nucleotides and nucleic acids
Which one of the following is not related to mitochondria?
A.
Cristae
B.
F1 particles
C.
Oxysome
D.
Quantasome
A DNA strand is directly involved in the synthesis of the following except:
A.
tRNA
B.
mRNA
C.
Complimentary DNA strand
D.
Protein molecule
"Perimitochondria" space in mitochondria is:
A.
The central lumen filled with dense mitochondrial matrix
B.
The inner membrane infolding, cristae
C.
The fluid filled space between the two unit membranes of mitochondria
D.
The outermost part bounded by single unit membrane
Smooth ER are involved in:
A.
Protein synthesis in some cells
B.
Lipid synthesis in some cells
C.
Processing and packaging of glycoproteins
D.
Ribosome formation
The elasticity of the cell membrane is mainly due to:
A.
Outer and inner layer of protein molecules
B.
Middle layer of phospholipid molecules
C.
Outer layer of phospholipid molecules
D.
Middle layer of protein molecules
Two envelope system of a cell means having:
A.
Double walled plasma membrane
B.
Double walled nuclear membrane
C.
Envelops for nucleus and other cell organelles
D.
None of these
The prokaryotic cells lack:
A.
DNA
B.
Nuclear proteins
C.
Nuclear membrane
D.
RNA
In certain pathological conditions the lysosomes start to digest the various organelles of the cell and the process is known as:
A.
Autophagy
B.
Hetrophagy
C.
Coprophagy
D.
Homology
In the tissues of multicellular animals, the plasma membrane of two adjacent cells usually remains separated by a space of:
A.
10 to 50 Å
B.
110 to 150 Å
C.
10 to 15 Å
D.
200 to 250 Å
The nuclear membrane is mainly made up of:
A.
Lipid and Carbohydrate
B.
Lipid and Protein
C.
Protein and Starch
D.
Fat and Starch