Protein synthesis in an animal cell occurs
on ribosomes present in cytoplasm as well as in mitochondria.
on ribosomes present in the nucleolus as well as in cytoplasm.
only on ribosomes attached to the nuclears envelope and endoplasmic reticulum.
only on the ribosomes present in cytosol.
Correct Answer :
A. on ribosomes present in cytoplasm as well as in mitochondria.
Protein synthesis is the process by which amino acids are linearly arranged into proteins through the involvement of ribosomal RNA, transfer RNA, messenger RNA, and various enzymes. In animal cells, protein synthesis occurs on ribosomes present in cytoplasm as well as in mitochondria.
Related Questions
Membranous extensions in blue green algae are known as
phytochrome
chromatophore
mesosome
pneumatophore
Which of the following organelles is directly connected to the outer membrane of the nucleus in a eukaryotic cell?
Mitochondrion
Lysosome
Golgi apparatus
Endoplasmic reticulum
Function of contractile vacuole in Amoeba is
excretion and osmoregulation.
digestion and respiration.
osmoregulation and transportation.
none of the above.
Golgi apparatus is absent in
higher plants
yeast
bacteria and blue-green algae
None of the above
Which of the following pair are correctly matched ?
(I) Amyloplasts Store proteins
(II) Mitochondrion Power house of the cell
(III) Stroma Chlorophyll pigment
(IV) Axoneme 9 + 2 array
(I) and (III) only
(II), (III) and (IV) only
(III) and (IV) only
(II) and (IV) only
Basal bodies are associated with the formation of
phragmoplast
cilia and flagella
cell plate
kinetochore
Which cellular structure helps in transferring genetic information from one generation to another?
W
X
Y
Z
Which of the following statements are correct ?
- In prokaryotic cells, a special membranous structure formed by the extension of the plasma membrane into the cell is known as polysome.
- The smooth endoplasmic reticulum is the major site for synthesis of glycoproteins.
- RuBisCO is the most abundant protein in the whole biosphere.
- Mitochondria, chloroplasts and peroxisomes are not considered as part of endomembrane system. Of the above statements
(iii) and (iv)
(i) and (ii)
(ii) and (iii)
(i) and (iv)
What would happen if lysosomes get ruptured in a cell?
Cell dies
Cell shrinks
Cell swell up
Nothing would happen
The main organelle involved in modification and routing of newly synthesized proteins to their destinations is
chloroplast
mitochondria
lysosome
endoplasmic reticulum
In prokaryotes, chromatophores are
specialized granules responsible for colouration of cells
structures responsible for organizing the shape of the organism.
inclusion bodies lying free inside the cells for carrying out various metabolic activities.
internal membrane system which becomes extensive and complex in photosynthetic bacteria.
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
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)
Which of the following lacks cell wall?
Gametes
Amoeba
Mycoplasma
All of these
Microtubules are absent in
mitochondria
centriole
flagella
spindle fibres
Cell sap is a
living content of cytoplasm.
nonliving content of cytoplasm.
nonliving content of vacuole.
living content of vacuole.
Match column-I and column-II and select the correct answer
| Column-I | Column-II |
|---|---|
| A. Bacteria without walls | I. Lysosome |
| B. Small circular DNA | II. Mycoplasma cells |
| C. Flattened sacs in | III. Thylakoid a chloroplast |
| D. A vesicle in which | IV. Plasmid hydrolytic enzymes are stored |
A III; B IV; C II; D I
A II; B IV; C III; D I
A I; B II; C III; D IV
A IV; B III; C I ; D II
Select the incorrect statement about prokaryotic ribosomes.
50S and 30S subunits unite to form 70S ribosomes.
Polysome/polyribosome consists of many ribosomes only.
Ribosome is the site of protein synthesis.
Polysome indicate the synthesis of identical poolypeptide in multiple copies.
8.A student was given cell samples (A and B) to identify parts which are highlighted. He observed the samples under the microscope and list down the function of the part of cell sample. The information collected by the student is listed in the table below, on the basis of which the student infers that the samples contain the organelles.
| Sample A | Sample B |
|---|---|
| Make energy available for cellular metabolism | Generates ATP and synthes izes s ugar |
| Absent in cell that carry oxygen throughout the body | Present in plant cell |
| Called the energy currency of cell | Source o f all the food energy |
Identify the part highlighted in the sample A and B and explain why they were called as semi-autonomous organelles?
Sample A - Mitochondria, Sample B - Chloroplast; because both the organelles are double membrane bound structure.
Sample A- Mitochondria, Sample B - Chloroplast; because they both are capable of synthesis of their own proteins only.
Sample A - Mitochondria, Sample B - Chloroplast; because they are capable of synthesis of their own proteins and contain their own DNA.
Sample A- Mitochondria, Sample B - Chloroplast; because they contain their own DNA to transfer the genetic information from one generation to another.
A student placed two cells in the same solution in two different containers. The observation was given in the table.
| Container | Observation |
|---|---|
| 1 | Cell burst |
| 2 | Cell does not change its shape |
Which structure maintains the shape of the cell present in container 2 and provides the most significant difference between the two cells?
Nucleus
Cell wall
Chloroplast
Cell membrane
Which one of the following cellular parts is correctly matched with their characters ?
Centrioles Sites for active RNA synthesis.
Lysosomes Optimally active at a pH of about 8.5.
Thylakoids Flattened membranous sacs forming the grana of chloroplasts.
Ribosomes Those on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S).
Which one of the following is not considered as part of the endomembrane system?
Golgi complex
Peroxisome
Vacuole
Lysosome
Study the following statements on cilium or flagellum and answer the question.
- Cilium / Flagellum contains an outer ring of nine doublet microtubules surrounding two singlet microtubules.
- Cilia are smaller which work like oars, causing the movement of either the cells or surrounding fluid.
- Flagella are comparatively longer and responsible for cell movement.
- Cilium and flagellum are covered with plasma membrane.
Which of the above statements are correct?
(i) and (ii)
(i), (ii), (iii) and (iv)
(i) and (iv)
(ii) and (iii)
The figure below shows the structure of a mitochondrion with its four parts labelled (A), (B), (C) and (D).
Select the part correctly matched with its function.
Part (D): Outer membrane Gives rise to inner membrane by splitting.
Part (B): Inner membrane Forms infoldings called cristae.
Part (C): Cristae Possess single circular DNA molecule and ribosomes.
Part (A): Matrix Major site for respiratory chain enzymes.
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
The membrane of the erythrocytes has approximately ___% of proteins and ___% lipids.
42, 50
52, 40
50, 50
60, 40
Identify the components labelled A, B, C and D in the given section of cilia/flagella showing different parts. Choose the option which shows the correct labelling of parts.
A Plasma membrane, B Interdoublet bridge, C Central microtubule, D Radial spoke
A Plasma membrane, B Arm, C Central microtubule, D Radial spoke
A Plasma membrane, B Interdoublet bridge, C Hub, D Radial spoke
A Plasma membrane, B Interdoublet bridge, C Hub, D Arm
Microtubules, motor proteins, and actin filaments are all part of the
mechanism of photosynthesis that occurs in chloroplasts.
rough ER in prokaryotic cells.
cytoskeleton of eukaryotic cells.
process that moves small molecules across cell membranes.
Lysosomes contain
carbohydrates
hormones
nucleic acids
hydrolases.
Plastids are found in
all animal cells.
some animal cells.
all plant cells.
all plant cells and euglenoides.