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Q.121 Molecular biology is the study of :-
[CET Chd. 2002]
(1) Structure, function and cell
reproduction
(2) Physio-biochemiccal studies of
biomolecules
(3) studying tissues under
microscope
(4) metabolicactivitity of life
Q.122 The subcelluar components can be separated by -
[CMC Ludhiyann 2002,2003]
(1) Paper chormatography
(2) autoradiography
(3) gel electrophoresis
(4) differential and density
gradient centrifugation
Q.123 The choromosome separation during metaphase can be
best studies by -
[CET Chd.
2002,2003]
(1) phase contrast microscope
(2) TEM
(3) X-ray technique
(4) Scannning electron
microscope
Q.124 The techniqe chromatography was developed by - [BVP Pune 2002]
(1) Wilkins (2)
GeorgyGey
(3) Tswett (4) Zernicks
Q.125 Which of the following dye is used for staining cell
organalle, mitochondria ?
[PB PMT 2003]
(1) Janus Green (2)
Saffranin
(3) Azure B (4)
Crystal violet
Q.126 In fluid mosaic model of plasma membrane - [CBSE
- 2002]
(1) Upper
layer is non-polar and hydrophilic
(2) Polar
layer is hydrophobic
(3) Phospholipids
form a bimolecular layer in middle part
(4) Proteins
form a middle layer
Q.127 According to widely accepted ‘‘fluid mosaic model’’
cell membranes are semi-fluid, where lipids and integral proteins can diffuse
randomly. In recent years, this model has been modified in several respects. In
this regard, which of the following statements is incorrect - [CBSE - 2005]
(1) Proteins
can also undergo flip-flop movements in the lipid bilayer
(2) Many
proteins remain completely embeded within the lipid bilayer
(3) Proteins
in cell membranes can travel within the lipid bilayer
(4) Proteins
can remain confined within certain domains of the membranes
Q.128 Which one of the following is not a constituents of
cell membrane -
[CBSE - 2007]
(1) Cholesterol (2) Glycolipids
(3) Proline (4) Phospholipids
Q.129 The main organelle involved in modification and
routing of newly synthesized proteins to their destinations is - [CBSE - 2005]
(1) Endoplasmic Reticulum
(2) Lysosome
(3) Mitochondria
(4) Chloroplast
Q.130 Chlorophyll in chloroplasts is located in -
[CBSE - 2005]
(1) Grana
(2) Pyrenoid
(3) Stroma
(4) Both grana and stroma
Q.131 Which of the following statements regarding
mitochondrial membrane is notcorrect ? [CBSE - 2006]
(1) The
outer membrane resembles a sieve
(2) The
outer membrane is permeable to all kinds of molecules.
(3) The
enzymes of the electron transfer chain are embedded in the outer membrane.
(4) The
inner membrane is highly convoluted forming a series of infoldings
Q.132 Polysome is formed by -
[CBSE
- 2008]
(1) A
ribsome with several subunits
(2) Ribosomes
attached to each other in a linear arangement
(3) Several
ribsomes attached to a single mRNA
(4) Many
ribsonmes attached to a strand of endoplasmic reticulum
Q.133 Vacuole in a plant cell -
[CBSE
- 2008]
(1) Lack
membrane and contains air
(2) Lacks
membrane and contains water and excretory substances
(3) Is
membrane-bound and contains stroage protein and lipids
(4) Is
membrane-bound and contains water and excretory substances
Q.134 In germinating seeds fatty acids are degraded
exclusively in the -
[CBSE -
2008]
(1) Peroxisomes (2) Mitochondria
(3) Proplastids (4) Glyoxysomes
Q.135 Keeping in view the fluid mosaic model for the
structure of cell membrane, which one of the following statements is correct
with respect to the movment of lipids and proteins from one lipid monolayer to
the other (described as flipflop movement)?[CBSE - 2008]
(1) While
proteins can flip-flop, lipids can not
(2) Neither
lipids, nor proteins can flip-flop
(3) Both
lipids and proteins can flip-flop
(4) While
lipids can rarely flip-flop, proteins can not
Q.136 Three of the following satements regarding cell
organelles are correct while one is wrong. Which one is wrong -
[AIMS- 2005]
(1) Lysomes
are double membraned vesicles budded off form golgiappratus and contain
digestive enzymes
(2) Endoplasmic
reticulum consists of a network of membranous tubules and helps in transport,
sytehsis and secretion
(3) Leucoplasts
are bound by two membranes lack pigment but contain their own DNA and protein
synthesizing machinery
(4) Spharosomes
are single membrane bonds and are associated with synthesis and storage of
lipids
Q.137 In which one of the following would you expect to
find glyoxysomes -
[AIMS- 2005]
(1) Endosperm
of wheat
(2) Endosperm
of castor
(3) Palisade
cells in leaf
(4) Root
hairs
Q.138 Which of the following statements regarding cilia is
not correct -
[CBSE- 2006]
(1) Cilia
contain an outer of nine doublet microtubules surrounding two single
microtubules
(2) The
organized beating of cilia is controlled by fluxes of Ca2+ across the membrane
(3) Cilia
are hair-like cellular
appendages.
(4) Microtubules
of cilia are composed of tubulin
Q.139 The contractile protein of skeletal muscle involving
ATPase activity is -
[CBSE- 2006]
(1) -Actinin (2) Troponin
(3) Tropomyosin (4) Myosin
Q.140 Select the wrong statement from the following-
[CBSE- 2007]
(1) Both
chloroplasts and mitochondria contain an inner and outer membrane
(2) Both
chloroplast and mitochondria have an internal compartment, the thylakoid space
bounded by the thylakoid membrane.
(3) Both
chloroplasts and mitochondria contain DNA
(4) The
chloroplasts are generally much larger than mitochondria
Q.141 The telomeres of euaryotic chromosomes consists of
short sequences of – [CBSE-
2004]
(1) Cytosine
rich repeats
(2) Adenine
rich repeats
(3) Guanine
rich repeats
(4) Thymine
rich repeats
Q.142 If you are provided with root-tips of onion in your
class and are asked to count the chromosomes which of the following stages can
your most convnintly look into -
[CBSE- 2004]
(1) Telophase (2) Anaphase
(3) Prophase (4) Metaphase
Q.143 Protein synthesis in an animal cell occurs- [CBSE-
2005]
(1) On
ribosomes present in cytoplasm as well as in mitochondria
(2) On
ribosomes present in the nucleolus as well as in cytoplasm
(3) Only
on ribosomes attached to the nulecar envelope and endoplasmic reticulum
(4) Only
on the ribosomes present in cytosol
Q.144 Telomerase is an enzyme which is a -
[CBSE-
2005]
(1) RNA
(2) Ribonucleoprotein
(3) Repetitive DNA
(4) Simple protein
Q.145 The length of DNA moelcule greatly exceeds the
dimensions of the nucleus in eukaryotic cells. How is the DNA accomodated ?
[CBSE- 2007]
(1) Deletion
of non-essential genes
(2) Supper-coiling
in nucleosomes
(3) DNase
digestion
(4) Through
elimination of repetitive DNA
Q.146 Which
one of the following proceeds re-formation of the nuclear envelope during M
phase of the cell cycle - [CBSE
2004]
(1)
Transcription from chromosomes and
reassembly of the of the nuclear lamina
(2)
Formation of the contractile ring and formation of the phragmoplast
(3)
Formation of the contractile ring and transcription from chromosome
(4)
Decondensation from chromosomes and reassembly of the nuclear lamina
Q.147 Crossing
over that results in genetic recombination in higher organisms occurs between - [CBSE 2004]
(1)
Non-sister chromatids of a bivalent
(2)
Two daughter nuclei
(3)
Two different bivalents
(4)
Sister chromatids of a bivalents
Q.148 In
the somatic cell cycle -
[CBSE
2004]
(1)
DNA replication takes place in S-phase
(2)
A short interphase is followed by a long mitotic phase
(3)
G2 phase follows mitotic phase
(4)
In G1 phase DNA content is double the amount of DNA
present in the orginal cell
Q.149 When
synapsis is complete all along the chromosome, the cell is said to have entered
a stage called - [CBSE 2004]
(1)
Zygotene (2) Pachytene
(3)
Diplotene (4) Diakinesis
Q.150 Many
cells function properly and divide mitotically though they do not have -
[AIIMS 2005]
(1)
Plasma membrane
(2)
Cytoskeleton
(3)
Mitochondria
(4)
Plastids
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