Zoology
Translation is the process in which:
A.
mRNA is formed from DNA
B.
Protein synthesis takes place at the site of ribosome
C.
Replication of DNA takes place
D.
Golgi bodies are formed
RNA can sometimes synthesize DNA from its single stranded template. This process is facilitated by:
A.
Ribozyme
B.
RNA primase
C.
RNA polymerase
D.
Inverse transcriptase
Which one the following sub processes does not take place during protein synthesis in eukaryotes?
A.
Translocation of mRNA relative to ribosomes
B.
Elongation
C.
Methionine formylation
D.
Termination
The main role of nucleolus in a nucleus is:
A.
DNA replication
B.
Ribosome synthesis
C.
Organization of chromosomes
D.
Chromatid separation
The movement of substances against their concentration gradients of the living system is called:
A.
Osmosis
B.
Diffusion
C.
Active transport
D.
Passive transport
The enzyme catalysing the formation of RNA from DNA template is:
A.
Nuclease
B.
Endonuclease
C.
Transcriptase
D.
Polymerase
Which of the following is the best evidence for the lock and key theory of enzyme action?
A.
All isolated enzymes have been identified as proteins
B.
Compounds similar in structure to the substrate inhibit the reaction
C.
Enzymes are found in living organisms and speed up certain reactions
D.
Enzymes determine the direction of a reaction
Which one of the following sets of characters 90. represent that of the eukaryotic cystolic ribosomes?
A.
80S,(40S, 60S), (18S rRNA, 28S rRNA, 5.8S rRNA and 5S rRNA)
B.
70S, (30S, 60S), (16S rRNA, 23S rRNA and 5S rRNA)
C.
80S, (30S, 60S) (16S rRNA, 23S rRNA and 5S rRNA)
D.
70S, (40S, 50S), (18S rRNA, 28S rRNA, 5.8S rRNA and 5S rRNA)
The advantage arising out of the bioconcave nature of mammalian red blood cell will be:
A.
Enlargement of pores in the cell membrane for the release of waste products
B.
To increase its life span
C.
Increase in the surface area for an effective exchange of O2 and CO2
D.
None of these
Each stalked particle of the inner membrane of mitochondria is called:
A.
F0 particle
B.
F1 particles
C.
F0 - F1 particle
D.
F2 particle
A clear cut evidence that in certain cases, RNA forms the genetic hereditary material comes from the fact that:
A.
When virus particles are extracted seperately from infected host, only RNA is found to produce infection
B.
RNA is able to dissociate itself and enters the genetic material
C.
RNA codes for DNA which then forms the 86 protein molecule
D.
RNA first enters the genes followed by DNA
Polysome is the collective name for the:
A.
Cytoplasmic cell organelle obtained after centrifugation of the cell
B.
Mass of substances biosynthesized in the cell
C.
Artificially generated disrupted membrane fragments of granular endoplasmic reticulum
D.
Group of ribosomes participating in synthesis of polypeptide chains using the same mRNA
Which one of the following would represent the complete and accurate depiction of the "central dogma" in molecular biology?
A.
DNA --> RNA --> Protein
B.
DNA --> RNA --> Protein
C.
DNA --> Protein --> RNA
D.
RNA --> DNA --> Protein
Which one of the following is the largest chromosome?
A.
Super numerary chromosome
B.
Polytene Chromosome
C.
X - Chromosome
D.
Lampbrush chromosome
The endoplasmic reticulum acts as a circulatory or transporting system. Various secretory products of granular endoplasmic reticulum are transported to various organelles are follows:
A.
Agranular ER --> Granular ER --> Golgi membranes --> Lysosomes
B.
Agranular ER --> Granular ER --> Lysosomes --> Golgi membrane
C.
Granular ER --> Agranular ER --> Golgi membrane --> Lysosome
D.
Granular ER --> Agranular ER --> Lysosome --> Golgi membrane
The process of cell drinking is facilitated by:
A.
Pinosomes
B.
Phagosomes
C.
Diffusion
D.
Osmosis
Puffs and bulbs are related to:
A.
Nucleic acid
B.
Lampbrush chromosomes
C.
Polytene chromosomes
D.
None of these
The function of microtubules are:
A.
Transportation of water, ions, etc.
B.
Cytoplasmic streaming
C.
Formation of asters
D.
All of these
The functions of cytoplasmic vacuoles are:
A.
Storage
B.
Transmission of materials
C.
Maintenance of the internal pressure of the cell
D.
All of these
The nucleus of an animal cell gets destroyed. Which other structure, then can be assumed to be absent?
A.
Ribosome
B.
Chromosome
C.
Centriole
D.
Mitochondria
The _____ is positioned in the gap between both ribosomal subunits:
A.
mRNA
B.
tRNA
C.
rRNA
D.
Both (a) and (b)
Double stranded structure of DNA was discovered by:
A.
Watson and Crick
B.
Khurana
C.
Nirenberg
D.
Flemming and Punnet
Lethal gases were first discovered by:
A.
Cuenot
B.
Wanger
C.
Flemming
D.
Punnet
Peroxisomes resemble mitochondria in their:
A.
Cytochrome chain system
B.
ATP synthesis
C.
Uptake of molecular oxygen
D.
Double membrane envelope
Genes are made-up of:
A.
Nucleoproteins
B.
Lipoproteins
C.
Glycoproteins
D.
None of these