A cell of human being has 46 chromosomes; it divides to form some daughter cells, each having 23 pairs of chromosomes. The division would be
1.Mitosis
2.Meiosis
3.Amitosis
4.Budding
A chemical substance that reacts with enzyme but is not transformed into product and thus blocking active site is called
1.Substrate
2.Co-factor
3.Inhibitor
4.Promotor
A significant happening of meiosis is / are
1.Crossing over
2.Random assortment
3.Both of these
4.None of these
A special area of centromere with specific base arrangement and specific proteins where spindle fibers are attached is called
1.Chromatin
2.Aster
3.Kinetochore
4.Primary constriction
Apoptosis
1.Cell death due to tissue damage
2.Causes inflammation
3.Internal programme of events by which cell commits suicide
4.Damages neighboring cells
Bacteria which grow either in the presence or absence of oxygen
1.Aerobic bacteria
2.Anaerobic bacteria
3.Facultative bacteria
4.Microaerophilic
Branch of biology which deals with the study of chemical components and chemical processes in living organisms is called
1.Molecular biology
2.Physiology
3.Biochemistry
4.Atomic biology
Breakdown of large molecules into smaller ones utilizing water molecules is
1.Hydration
2.Hydrolysis
3.Dehydration synthesis
4.Electrolysis
Cancer cells are
1.Differentiated
2.Undifferentiated
3.Highly differentiated
4.Less differentiated
Control of organisms by using living organisms is called
1.Bioremediation
2.Integrated disease management
3.Antisepsis
4.Biological control
Crossing over in meiosis occurs during
1.Zygotene
2.Pachytene
3.Dislotene
4.Diakinesis
Crossing over occurs between
1.Sister chromatids
2.Non sister chromatids
3.Independent chromatids
4.Each and every chromatid
Cytokinins refers to
1.Division of nucleus
2.Division of cytoplasm
3.Division of cell
4.All of these
Cytoskeleton involved in assembly and disassembly of the spindle during mitosis is of
1.Microtubules
2.Microfilaments
3.Intermediate filaments
4.None of these
Each bivalent has
1.3 chromatids
2.4 chromatids
3.5 chromatids
4.2 chromatids
Each kinetochore gets ________ fibers in mitosis
1.5
2.4
3.3
4.2
Feature of cancer cells in common?
1.High nucleus to cytoplasmic ratio
2.Prominent nucleoli
3.Many mitosis
4.All of these
From each pair of centrioles ________ sets of microtubules originate
1.2
2.3
3.4
4.5
Homologous chromosomes are
1.Similar and identical
2.Identical but not similar
3.Not similar and not identical
4.Similar but not identical
In plants mitotic apparatus consists of
1.Centriole
2.Centriole and asters
3.Centrioles, asters and spindles
4.Spindles only
Inability of chromosomes to segregate during anaphase and telophase of meiosis is called
1.Crossing over
2.Chromosomal disjunction
3.Chromosomal nondisjunction
4.None of these
Intake of liquid material by cell membrane is called
1.Endocytosis
2.Exocytosis
3.Phagocytosis
4.Pinocytosis
Interphase of meiosis lacks
1.G0 phase
2.G1 phase
3.G2 phase
4.S phase
Meiosis occur in
1.Diploid cells only
2.Haploid cells only
3.Both diploid and haploid cells
4.Monoploid cells only
Meiosis occurs at the time of
1.Gamete formation in animals
2.Spore formattion in plants
3.Growth in animals
4.Both a and b
Microtubules are composed of
1.Action protein
2.Actin and myosin proteins
3.Sphingomyelin and tubulin
4.Tubulin protein and traces of RNA
Mitosis takes place during
1.Healing of wound
2.Development and growth
3.Vegetative propagation
4.All of these
Mitotic apparatus in animals is formed by
1.Aster and spindle
2.Polar and kinetochore microtubules
3.Spindle and RNA
4.Spindle only
Morphology of chromosomes is best studied during
1.Telophase
2.Metaphase
3.Prophase
4.All of these
Most critical phase of mitosis is
1.Prophase
2.Anaphase
3.Metaphase
4.Telophase
Out of total organisms on earth, ______ are vascular plants
1.53.10%
2.19.90%
3.17.60%
4.9.40%
Pairing of homologous chromosomes is completed in
1.Leptotene
2.Zygotene
3.Pachytene
4.Diplotene
Percentage of water in brain cells is
1.20%
2.65%
3.85%
4.89%
Pox viruses are
1.RNA non-enveloped
2.RNA enveloped
3.DNA non-enveloped
4.DNA enveloped
Reverse of prophase is
1.Interphase
2.Metaphase
3.Anaphase
4.Telophase
Reverse transcriptase is present in
1.All RNA viruses
2.All DNA viruses
3.All retroviruses
4.All viruses
Ribosomes were discovered by
1.Golgi
2.De Duve
3.Palade
4.R.Brown
Spread of tumor cells and establishment of secondary areas of growth is
1.Benign tumors
2.Cancer
3.Metastasis
4.Epistasis
Tetrad or bivalent is
1.Paired homologous chromosome but not fused complex structure
2.2 unpaired homologous chromosome
3.Paired and fused complex structure
4.None of these
The longest phase of meiosis I is
1.Metaphase
2.Anaphase
3.Prophase
4.Telophase
Unbroken series of organisms arranged from ancestor to descendant sequence is
1.Biodiversity
2.Phyletic lineage
3.Connecting link
4.Evolutionary line
Which division does not show replication of chromosomes?
1.Mitosis
2.Meiosis I
3.Meiosis II
4.None of these
Which fibers intedigitate with each other?
1.Astral fibers
2.Kinetochore fibers
3.Polar fibers
4.All of these
Which is a feature of malignant tumor?
1.Localized
2.Little deleterious effects
3.Few mitosis
4.Metastasize
Which statement is not true about phragmoplast?
1.Formed from vesicle originating from Golgi apparatus
2.Present in plants only
3.Formed at the end of anaphase
4.Centre of dividing cell
_______ is concerned with cell secretions
1.Endoplasmic reticulum
2.Golgi complex
3.Lysosomes
4.Cell membrane
_______ is the potential surce of chemical energy for cellular activities
1.C-H bond
2.C-O bond
3.C-N bond
4.P-O-C bond