If a chloroplast of plant is isolated and studied in a test tube the investigation is described
as
in vivo
in vitro
in situ
none of these.
An organelle present in plant cells but absent from those of animals is
vacuole
peroxisome
glyoxysomes
Both 1. and 3.
Primary cell wall consists of a loose network of cellulose microfibrils impregnated with a
matrix of
glycoprotein and flavoprotein
hemicellulose and flavoprotein
hemicellulose and pectin
flavoprotein and pectin.
Which of the following is not a true subcellular organelle ?
Peroxisome
Ribosome
Chloroplast
Lysosome.
Golgi body is associated with
packaging and storage of material
cell wall formation
transport of enzyme
all of the above
Which of the following cytoskelelal components of an eukaryotic cell play a major role in
protoplasmic streaming?
Microtubules
microfilaments
Intermediate filaments
None of these
Free radicals in our body have been implicated in
ageing
certain degenerative disorders
neurodegeneration
all the above
Which is not true for prokaryotic cells ?
They are smaller than eukaryotic cells.
They lack membrane-bound organelles.
Their genetic material is localised within nucleoid.
They contain a well developed cytoskeleton.
If there were present no subcellular organelles in a eukaroytic cell, the rate of
metabolism will
increase
decrease
not change
increase dramatically.
Extranuclear genes occurs in
plastids and are not inherited
plasmid and are not inherited
mitochondria and are inherited by female
mitochondria and are inherited by male.
Some Gram -ve bacteria have peptidoglycan and an extra layer of
lipo-polysaccharide
teichoic acid
cellulose
both 2. and 3.
A chromosome carrying the centromere at one of the ends is called
acentric
submetacentric
telocentric
metacentric.
Plasmodesmata connections help in
cytoplasmic streaming
synchronous mitotic divisions
locomotion of unicellular organism
movement of substances between cells.
Three of the following statements regarding cell organelles are correct while one is wrong. Which one is wrong?
Lysosomes are double membraned vesicles budded off from Golgi apparatus and contain digestive enzymes.
Endoplasmic reticulum consists of a network of membranous tubules and helps in transport, synthesis and secretion
Leucoplasts are bound by two membranes, lack pigment but contain their own DNA and protein synthesizing machinery.
Sphaerosomes are single membrane bound and are associated with synthesis and storage of lipids.
In which one of the following would you expect to find glyoxysomes?
Endosperm of wheat
Endosperm of castor
Palisade cells in leaf
Root hairs
Genes present in the cytoplasm of eukaryotic cells are found in
mitochondria and inherited via egg cytoplasm
Lysosomes and peroxisomes
lysosomes and peroxisomes
plastids and inherited via male gamete
What is common between chloroplasts, chromoplasts and leucoplasts ?
Presence of pigments
Possession of thylakoids and grana
Storage of starch, proteins and lipids
Ability to multiply by a fission-like process
"Omnis-cellula-e-cellula" was given:
Virchow
Hooke
Leeuwenhoek
Brown.
Which of the following is responsible for the mechanical support, protein synthesis and enzyme transport ?
Cell membrane
Mitochondria
Dictyosome
Endoplasmic reticulum
Specific proteins responsible for the flow of materials and information into the cell are called
membrane receptors
carrier proteins
integral proteins
none of these
Who invented electron microscope ?
Jansen
Edison
Knoll and Ruska
Landsteiner
What is a plasmid ?
Bacterial, linear, dsDNA
Extra chromosomal linear RNA
Extra chromosomal circular dsDNA
Autonomously replicating circular RNA
Cell theory was proposed by
a botanist
a zoologist
a botanist and a zoologist
a psychologist.
Which of the following organelles contain DNA?
(i) Mitochondria (ii) Chloroplasts (iii) Golgi bodies (iv) Ribosomes
(i) and (ii)
(ii) and (iii)
(i) only
(iv) only.
Chromatin is made up of:
DNA and protein
DNA and histone
DNA, RNA, protein
RNA, histone and oil bodies.
Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?
They are absent in animal cells.
They act as channel proteins.
They are absent in plant cells.
They are only externally located
Identify the accurate explanation of mesosome.
It is
a specialised structure of prokaryotic cell formed by extension of plasma membrane into the cytoplasm
the middle layer of the prokaryotic cell wall
the organelle of eukaryotic cell which helps in lipid synthesis
the middle layer of eukaryotic cell wall.
Mitochondria and chloroplast are believed to be bacterial endosymbiont because
I. they have self nucleic acid i.e., circular ds, DNA and RNAs
II. 70s ribosomes
III. their membrane resembles that of bacteria
IV. ETS and ATP forming machinery is present.
I and II
I, II and III
All of these
I and IV
If a biochemical analysis of mitochondria has to be done, the best procedure would be
select cells which have a larger number of mitochondria
plasmolyse the cell and filter out the mixture and take the debris
grind the cells and filter out the mixture and take the debris
subject the cell to cell fractionation (centrifuge) and obtain mitochondria
Which one of the following structure is an organelle within an organelle?
Peroxysome
ER
Mesosome
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