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The following diagram represents a structure chromosome.
Identify the structures marked as A, B and C.

A. A - Satellite, B - Primary constriction, C - Acrocentric

B. A - Satellite, B - Secondary constriction, C - Metacentric

C. A - Satellite, B - Centromere, C - Telocentric

D. A - Satellite, B - Centromere, C - Submetacentric

Correct Answer :

B. A - Satellite, B - Secondary constriction, C - Metacentric


The figure shows the structure of metacentric (C) chromosomes. The parts marked as A and B are respectively are satellite and secondary constriction. Metacentric chromosomes have the centromere in the centre, due to which both sections are of equal length. Human chromosome 1 and 3 are metacentric.

Related Questions

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Match column-I with column-II and select the correct option.
Column - IColumn - II
A. Golgi apparatusI. Storage
B. MitochondriaII. Photosynthesis
C. VacuolesIII. Transport
D. GranaIV. Secretion
..V. Respiration

A. A - IV, B - V, C - I, D - II

B. A - I, B - II, C - IV, D - III

C. A - IV, B - I, C - II, D - III

D. A - I, B - II, C - III, D - IV

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Function of RER is

A. autolysis

B. protein synthesis

C. lipid synthesis

D. carbohydrate synthesis

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The best material for study of structure of cell membrane is

A. RBC of human

B. RBC of frog

C. cheek cell of human

D. liver cell of rat

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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?

A. Cytosol

B. Mitochondria

C. Lysosomes

D. Golgi bodies

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Which of the following statements is/are correct ?
  1. The shape of the cells may vary with the function they perform.
  2. Human RBC is about 7.0 ??m in diameter.
  3. Cytoplasm is the main area of cellular activities.
  4. Various chemical reactions occur in cytoplasm to keep the cell in the living state.

A. (i), (ii), (iii) and (iv)

B. Only (i) and (ii)

C. Only (iv)

D. None of the above

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The main organelle involved in modification and routing of newly synthesized proteins to their destinations is

A. chloroplast

B. mitochondria

C. lysosome

D. endoplasmic reticulum

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The following diagram shows some of the missing structures in a plant cell marked as A, B, C, D E. Choose the option with their correct names.

A. A - Plasmodesmata, B - Rough endoplasmic reticulum, C - Golgi apparatus, D - Mitochondrion, E - Ribosomes

B. A - Desmosome, B - Rough endoplasmic reticulum, C - Golgi apparatus, D - Mitochondrion, E - Ribosomes

C. A - Plasmodesmata, B - Smooth endoplasmic reticulum, C - Golgi apparatus, D - Mitochondrion, E - Ribosomes

D. A - Tight junction, B - Rough endoplasmic reticulum, C - Golgi apparatus, D - Mitochondrion, E -Ribosomes

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Which of the following pair lack the unit membrane?

A. Nucleus and E.R.

B. Mitochondria and chloroplast

C. Ribosome and nucleolus

D. Golgi body and lysosome

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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.

A. Part (D): Outer membrane Gives rise to inner membrane by splitting.

B. Part (B): Inner membrane Forms infoldings called cristae.

C. Part (C): Cristae Possess single circular DNA molecule and ribosomes.

D. Part (A): Matrix Major site for respiratory chain enzymes.

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Microtubules are absent in

A. mitochondria

B. centriole

C. flagella

D. spindle fibres

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Function of contractile vacuole in Amoeba is

A. excretion and osmoregulation.

B. digestion and respiration.

C. osmoregulation and transportation.

D. none of the above.

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Which of the following terms is not correctly matched with its feature?

A. Osmosis Movement of water by diffusion.

B. Nucleoplasm Site of active synthesis of ribosomal RNA.

C. Mesosome Infolding of cell membrane and characteristics of eukaryotes.

D. Pili Elongated tubular surface structures (made of special protein) of bacteria.

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Active transport differs from passive transport in that active transport

A. requires energy.

B. always requires input of ATP.

C. moves molecules against a concentration gradient.

D. both (a) and (c)

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Which of the following statements are correct?

A. Na+/K+ pump is an example of active transport.

B. In plant cells lipid like steroidal hormones are synthesized in SER.

C. In plant cells, the vacuoles can occupy up to 10% of the volume of the cell.

D. Chlorophyll and leucoplast are responsible for trapping light energy essential for photosynthesis.

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4

Which of the following statement is false?

A. The ribosomes of a polysome translate the mRNA into protein.

B. Mitochondria divide by fragmentation.

C. All cell arise from pre-existing cells.

D. The lipid component of the membrane mainly consists of phosphoglycerides.

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Both the membranes of mitochondrion are

A. structurally different but functionally similar.

B. structurally as well as functionally different.

C. structurally similar but functionally different.

D. structurally different but functionally similar.

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Grana are

A. protein storing plastids.

B. coloured plastids.

C. stacks of thylakoids.

D. individual thylakoids present in stroma.

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Which of the following organelles is directly connected to the outer membrane of the nucleus in a eukaryotic cell?

A. Mitochondrion

B. Lysosome

C. Golgi apparatus

D. Endoplasmic reticulum

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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?

A. Proteins in cell membranes can travel within the lipid bilayer.

B. Proteins can also undergo flip-flop movements in the lipid bilayer.

C. Proteins can remain confined within certain domains of the membrane.

D. Many proteins remain completely embedded within the lipid bilayer.

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Centrioles and centrosomes occur in the cells of

A. green plants

B. animals

C. bacteria and cyanobacteria

D. both (b) and (c)

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Match column-I (cell organelle) with column-II membrane and select the correct option from the codes given below.
Column-IColumn-II
A. MitochondriaI. Without membrane
B. LysosomesII. Single membrane
C. RibosomesIII. Double membrane

A. A - I, B - II, C - III

B. A - III, B - I, C - II

C. A - III, B - II, C - I

D. A - II, B - III, C - I

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Prokaryotic and eukaryotic flagella differ in the

A. type of movement and placement.

B. location and mode of functioning.

C. microtubular structure and function.

D. microtubular organization and type of movement.

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In the given figure of animal cell, one orginelle is marked as A. Select the correct identification and function of the organelle A from the given option.

A. Endoplasmic reticulum Synthesis of lipids.

B. Mitochondria Produce cellular energy in the form of ATP.

C. Golgi body Provides packaging material.

D. Lysosomes Secrete hydrolytic enzymes.

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Active transport across biomembrane involves

A. production of ATP

B. requirement of energy

C. production of toxin

D. release of energy

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Identify the cell organelle given below. Which is an important site of formation of glyeoproteins & glycolipids

A. Rough endoplasmic reticulum

B. Smooth endoplasmic reticulum

C. Golgi body

D. mitochondria

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Microtubules, motor proteins, and actin filaments are all part of the

A. mechanism of photosynthesis that occurs in chloroplasts.

B. rough ER in prokaryotic cells.

C. cytoskeleton of eukaryotic cells.

D. process that moves small molecules across cell membranes.

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Consider the following statements and choose the correct statement.
  1. The endomembrane system includes mitochondria, chloroplast and peroxisomes.
  2. Smooth endoplasmic reticulum is the major site for synthesis of lipid.
  3. Rough endoplasmic reticulum is actively involved in protein synthesis.
  4. Mitochondrial matrix possesses single circular DNA, a few RNA and 80S ribosomes. Of the above statements.

A. (i) and (iii)

B. (ii) and (iv)

C. (iii) and (iv)

D. (ii) and (iii)

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Basal bodies are associated with the formation of

A. phragmoplast

B. cilia and flagella

C. cell plate

D. kinetochore

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Match column-I with column-II and choose the correct option.
Column-IColumn-II
(Chromosome)(Position of Centromere)
A. MetacentricI. At the tip
B. SubmetacentricII. Almost near the tip
C. AcrocentricIII. At the middle
D. TelocentricIV. Slightly away from the middle

A. A III; B IV; C II; D I

B. A IV; B III; C II; D I

C. A I; B II; C III; D IV

D. A IV; B III; C I ; D II

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Which one of the following pairs is not correctly matched?

A. Cristae The tubular structure formed by the folding of the inner membrane of the mitochondrion.

B. Plasmodesmata The membrane surrounding the vacuole in plants.

C. Grana Membrane bound discs in chloroplasts that contain chlorophylls and carotenoids.

D. Middle lamella Layer between adjacent cells walls in plants derived from cell plate.