biology unit 1 Online Test

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 you must conveniently look into:
telophase
anaphase
prophase
metaphase
The main function of plasma membrane is to:
Store cell material
Control of all cellular activity
Maintain the cell shape and size
Regulate the flow of material into and outside the cell
Golgibody is concerned with:
Respiration
Secretion
Excretion
Degradation
Three of the following statements regarding cell organelles are correct while one is wrong?
Lysosome is a double membrane vesicles budded off from Golgibody and contains digestive enzymes.
Endoplasmic reticulum consists of a network of membranous tubules and help in transport, synthesis and secretion.
Leucoplasts are bound by two membranes lack pigments but contains their own DNA and protein synthesizing machinery.
Spherosome are single membrane bound and are associated with synthesis and storage of lipids.
Which of the following organelle stores proteins?
Amyloplast
Aleuroplast
Plastids
Elaioplast
Chlorophyll in chloroplasts is located in:
grana
pyrenoid
stroma
Both grana and stroma
Vesicles having fat droplets are called as:
mesosome
liposome
endosome
polysome
The proper folding of proteins following synthesis is assisted by:
polyribosome
specific proteins called chaperons
polysome
free ribosome
The smallest cell organelle is:
Lysosome
Ribosome
Peroxisomes
None of these
Lysosomes are formed by budding off vesicles from Golgi apparatus and contains:
oxidizing enzyme
acid hydrolases
respiratory enzyme
basic hydrolases
The universally accepted model of plasma membrane is:
lamellar model
unit membrane model
fluid mosaic model
overtone model
The membrane covering the vacuole is known as:
desmosomes
tonoplast
plasmodesmata
tyloses
Cells originate:
from pre existing cells
from abiotic material
by bacterial fermentation
by regeneration of old cells
Rapid, abnormal and uncontrolled cell division(mitosis)results in:
Gametogenesis
Cancer
New organism
Synopsis
Plasma membrane is fluid structure due to presence of:
carbohydrates
lipid
glycoprotein
polysaccharides
Longest cell in the human body is:
liver cell
muscle cell
neuroglia cell
nerve cell
Which of the following phases are longest and shortest in mitosis?
Metaphase ,Anaphase
Prophase , Anaphase
Telophase ,Anaphase
Prophase ,Telophase
Nuclear envelop disappear at:
Metaphase
Anaphase
Early prophase
Late prophase
The cell would normally proceed to mitosis without interruption:
when it has entered S phase
once it has entered G2 phase
at any time during cell division
irrespective of any phase
Condensation of chromosome with visible Centro mere occurs during:
G1- phase
S –phase
G2 – phase
M – phase
During cell cycle, two molecules of DNA are present in chromosome during?
G1 – phase
Beginning of S phase
G2 – phase
End of M phase
Which of the following is proper sequence in mitosis?
Metaphase, telophase, prophase and anaphase
Prophase, metaphase, anaphase and telophase
Anaphase , metaphase, telophase and prophase
Telophase, anaphase, metaphase and prophase
Mitosis in animal cell is:
An astral
Amphiastral
Pre- mitosis, Acentric
Eumitosis ,Acentric
A major break through in the studies of cells came with the development of electron microscope. This is because
the resolving power of the electron microscope is 200- 350 nm as compared to 0.1- 0.2 for the light microscope
electron beam can pass through thick materials, whereas light microscopy requires thin sections
the electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons
the resolution power of the electron microscope in much higher than that of the light microscope
The sequence of cell cycle is:
S ,M ,G1,and G2
G1 ,G2,S and M
M ,G1 ,G2 ,and S
G1, S, G2 and M
During cell cycle DNA replicates:
once
twice
many times
not at all
Carbohydrates, the most abundant biomolecules on earth, are produced by:
some bacteria, algae and green plant cells
fungi, algae and green plant cells
all bacteria, fungi and algae
viruses, fungi and bacteria
Centromere is required for:
movement of chromosomes of towards poles
cytoplasmic cleavage
crossing over
transcription
Mitotic spindle is mainly composed of which protein?
Actin
Myosin
Actomyosin
Myoglobin
Best material for the study of mitosis in laboratory is
anther
root tip
leaf tip
ovary
In which one of the following is nitrogen not a constituent?
Pepsin
idioblast
Bacteriochlorophyll
Invertase
A bacterium divides every 35 minutes. If a culture containing 105 cells per ml is grown for 175 minutes, what will be the cell concentration per ml after 175 minutes?
5* 105 cells
35*105 cells
32* 105 cells
175*105 cells
The proteins are synthesised at
ribosomes
mitochondria
centrosomes
golgi bodies
During cell division, the spindle fibers attach to the chromosome at a region called
chromcentre
kinetochore
centriole
chromomere
The function of rough endoplasmic reticulum is
fat synthesis
lipid synthesis
protein synthesis
steroid synthesis
Lysosomes have a high content of
hydrolytic enzymes
lipoproteins
poyribosomes
DNA ligases
How many mitotic divisions are needed for a single cell to make 128 cells?
7
14
28
64
Cell organelles having hydrolases/digestive enzymes are
Peroxisome
Lysosomes
Ribosomes
Mesosomes
Series of reactions which can convert fatty acids to sugars in plants but not in animals is
Krebs cycle
Glyoxylate cycle
Ornithine cycle
Glycolysis
Golgi apparatus is absent in
Higher plants
Yeast
Bacteria and Blue- green algae
None
Magnification of compound microscope is not connected with
Numerical aperture
Focal length of objective
Focal length of eye piece
Tube length
Ribosomes are the centre for
Respiration
Photosynthesis
Protein synthesis
Fat synthesis
Number of chromatids at metaphase is
Two each in mitosis and meiosis
Two in mitosis and one in meiosis
Two in mitosis and four in meiosis
One in mitosis and two in meiosis
Electron microscope has a high resolution power. This is due to
Electromagnetic lenses
Very low wavelength of electron beam
Low wavelength of light source used
High numerical aperture of glass lenses used
Resolution power is the ability to
Distinguish two close points
Distinguish two close objects
Distinguish amongst organelles
Magnify image
Cell wall shows
Complete permeability
Semipermeability
Differential permeability
Impermeability
Mitotic anaphase differs from metaphase in possessing
Same number of chromosomes and same number of chromatids
Half number of chromosomes and half number of chromatids
Half number of chromosomes and same number of chromatids
Same number of chromosomes and half number of chromatids
Polyribosomes are aggregates of
Ribosomes and rRNA
Only rRNA
Peroxisomes
Several ribosomes held together by string of mRNA
Description:

cells

Tags:

Biology

Discussion

diksha sharma

yeah i scored 43

3888 days 14 hours 31 minutes ago

niharika

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thnk u

3894 days 9 hours 4 minutes ago

diksha sharma

hi i scored 39......thankssssssss

3900 days 12 hours 30 minutes ago

Joy Goswami

I have scored 26 ............ can u post some more tests . I am a student of class 12 !!!!!!!

3939 days 11 hours 26 minutes ago

Meghna B

nyc test....its helpful.........
scored 28..!!!
plz inbox me the method of gettin answer in que..32 and 37
TanQ

3954 days 6 hours 39 minutes ago

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