Difference between the prokaryotic and eukaryotic cells in having
cell wall
nuclear membrane
ribosome
none of these
Correct Answer :
B. nuclear membrane
The prokaryotic cells do not have nuclear membrane while eukaryotic cell have well organized nuclear membrane.
Related Questions
Polysome is a chain of
oxysomes
sphaerosomes
ribosomes
dictyosomes
Nucleolus is
rounded structure found in cytoplasm near nucleus.
rounded structure inside nucleus and having rRNA.
rod-shaped structure in cytoplasm near the nucleus.
none of the above.
The cytoskeleton is a proteinaceous network of fibres in the cytoplasm. It is involved in
mechanical support.
motility.
maintenace of cell-shape.
all of the above
Basal bodies are associated with the formation of
phragmoplast
cilia and flagella
cell plate
kinetochore
Centrioles and centrosomes occur in the cells of
green plants
animals
bacteria and cyanobacteria
both (b) and (c)
Which cellular structure helps in transferring genetic information from one generation to another?
W
X
Y
Z
Match column-I with column-II and choose the correct option.
| Column-I | Column-II |
|---|---|
| A. Tonoplast | I. Contain digestive enzyme |
| B. Contractile vacuole | II. Store metabolic gases |
| C. Food vacuole | III. Excretion |
| D. Air vacuole | IV. Transport of ions in plants |
A IV; B III; C I; D II
A II; B III; C IV; D I
A IV; B II; C III; D I
A I; B III; C II; D IV
_______________ is the important site of formation of glycoproteins and golycolipids.
SER
Lysosome
Golgi apparatus
Mitochondria
Which one of the following structures between two adjacent cells is an effective transport pathway?
Plasmodesmata
Plastoquinones
Endoplasmic reticulum
Plasmalemma
Function of RER is
autolysis
protein synthesis
lipid synthesis
carbohydrate synthesis
Which of the following is not the function of cell wall?
- Provides shape to the cell.
- Protects the cell from mechanical damage and infection.
- Helps in cell to cell interaction.
- Provides barrier to undesirable macromolecules.
Only (i)
Only (iv)
Only (ii), (iii) and (iv)
None of the above
Which of the following statements is/are correct ?
- The endomembrane system includes plasma membrane, ER, Golgi complex, lysosomes and vacuoles.
- ER helps in the transport of substances, synthesis of proteins, lipoproteins and glycogen.
- Ribosomes are involved in protein synthesis.
- Mitochondria help in oxidative phosphorylation and generation of ATP.
(ii), (iii) & (iv)
(i) only
(ii) only
(iii) only
Match column-I with column-II and select the correct option.
| Column - I | Column - II |
|---|---|
| A. Golgi apparatus | I. Storage |
| B. Mitochondria | II. Photosynthesis |
| C. Vacuoles | III. Transport |
| D. Grana | IV. Secretion |
| .. | V. Respiration |
A - IV, B - V, C - I, D - II
A - I, B - II, C - IV, D - III
A - IV, B - I, C - II, D - III
A - I, B - II, C - III, D - IV
Satellite means
terminal part of the chromosome beyond secondary constriction.
terminal part of the chromosome beyond primary constriction.
terminal part of chromosome beyond tertiary constriction.
none of the above
Which of the following statements is/are correct ?
- The shape of the cells may vary with the function they perform.
- Human RBC is about 7.0 ??m in diameter.
- Cytoplasm is the main area of cellular activities.
- Various chemical reactions occur in cytoplasm to keep the cell in the living state.
(i), (ii), (iii) and (iv)
Only (i) and (ii)
Only (iv)
None of the above
Choose the incorrect match.
Nucleus RNA
Lysosome Protein synthesis
Mitochondria Respiration
Cytoskeleton Microtubules
You are asked to examine a cell using a powerful light microscope. The image you see has a clearly defined nucleus and mitochondria. It also has a large central vacuole and chloroplasts. From what group of organisms did this cell most likely come?
Bacteria
Protists
Fungi
Plants
Match the items given in column-I with their role given in column-II and choose the correct option.
| Column-I | Column-II |
|---|---|
| A. SER | I. Increase the surface area |
| B. Golgi apparatus | II. Store oils or fats |
| C. Cristae | III. Excretion |
| D. Peroxisome | IV. Photorespiration |
| E. Elaioplasts | V. Synthesis of lipid |
A V; B III; C I; D IV; E II
A V; B III: C II; D IV; E I
A II; B III; C I; D IV; E V
A III; B IV; C I; D V; E II
Membranous extensions in blue green algae are known as
phytochrome
chromatophore
mesosome
pneumatophore
Identify the cell organelle given below. Which is an important site of formation of glyeoproteins & glycolipids
Rough endoplasmic reticulum
Smooth endoplasmic reticulum
Golgi body
mitochondria
Consider the following statements and choose the correct statement.
- The endomembrane system includes mitochondria, chloroplast and peroxisomes.
- Smooth endoplasmic reticulum is the major site for synthesis of lipid.
- Rough endoplasmic reticulum is actively involved in protein synthesis.
- Mitochondrial matrix possesses single circular DNA, a few RNA and 80S ribosomes. Of the above statements.
(i) and (iii)
(ii) and (iv)
(iii) and (iv)
(ii) and (iii)
The best material for study of structure of cell membrane is
RBC of human
RBC of frog
cheek cell of human
liver cell of rat
Grana are
protein storing plastids.
coloured plastids.
stacks of thylakoids.
individual thylakoids present in stroma.
What would happen if lysosomes get ruptured in a cell?
Cell dies
Cell shrinks
Cell swell up
Nothing would happen
Which of the following statements are correct?
Na+/K+ pump is an example of active transport.
In plant cells lipid like steroidal hormones are synthesized in SER.
In plant cells, the vacuoles can occupy up to 10% of the volume of the cell.
Chlorophyll and leucoplast are responsible for trapping light energy essential for photosynthesis.
Centrifugation of a cell results in the rupture of the cell membrane and the contents compacting into a pellets in the bottom of the centrifuge tube. Bathing this pellet with a glucose solution yields metabolic activity including the production of ATP. One of the contents of this pellet is most likely which of the following?
Cytosol
Mitochondria
Lysosomes
Golgi bodies
Identify the components labelled as A, B, C, D and E in the diagram given below from the list (i) to (viii).
- Cristae of mitochondria
- Inner membrane of mitochondria
- Cytoplasm
- Smooth endoplasmic reticulum
- Rough endoplasmic reticulum
- Mitochondrial matrix
- Ribosome
- Nucleus
A - (viii), B - (v), C - (vii), D - (iii), E - (iv)
A - (i), B - (iv), C - (vii), D - (vi), E - (iii)
A - (vi), B - (v), C - (iv), D - (vii), E - (i)
A - (v), B - (i), C - (iii), D - (ii), E - (iv)
Which of the following statements are incorrect ?
- Plant cells have centrioles which are absent in almost all animal cells.
- Ribosomes are the site of protein synthesis.
- The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
- In animal cell, steroidal hormones are synthesized by smooth endoplasmic reticulum. Of the above statements
(i) and (iii)
(iii) and (iv)
(ii) and (iv)
(i) and (iv)
Who proposed the theory that Cells arise only from the pre-existing cells?
Mohl
Virchow
Haeckel
Brown
Which of the following is incorrect ?
Mycoplasma is the smallest cell (0.3 �).
Bacteria are 3 to 5 �m in size.
The largest cell is the egg of an ostrich.
Nerve cells are some of the smallest cells.