Home
Current Affairs January 2024

What is the correct answer?

4

In prokaryotes, chromatophores are

A. specialized granules responsible for colouration of cells

B. structures responsible for organizing the shape of the organism.

C. inclusion bodies lying free inside the cells for carrying out various metabolic activities.

D. internal membrane system which becomes extensive and complex in photosynthetic bacteria.

Correct Answer :

D. internal membrane system which becomes extensive and complex in photosynthetic bacteria.


In some prokaryotes like cyanobacteria, there are membranous extensions into the cytoplasm called chromatophores which contain pigments.

Related Questions

What is the correct answer?

4

Match column-I with column-II and choose the correct option.
Column-IColumn-II
A. TonoplastI. Contain digestive enzyme
B. Contractile vacuoleII. Store metabolic gases
C. Food vacuoleIII. Excretion
D. Air vacuoleIV. Transport of ions in plants

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

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

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

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

What is the correct answer?

4

Active transport across biomembrane involves

A. production of ATP

B. requirement of energy

C. production of toxin

D. release of energy

What is the correct answer?

4

The given figures show two types of cell. Which structures are common to both the cells?

A. Nucleus and cell wall

B. Nucleus and cytoplasm

C. Ribosomes and flagella

D. Ribosomes and cell wall

What is the correct answer?

4

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

What is the correct answer?

4

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

What is the correct answer?

4

Which of the following statements are incorrect ?
  1. Plant cells have centrioles which are absent in almost all animal cells.
  2. Ribosomes are the site of protein synthesis.
  3. The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
  4. In animal cell, steroidal hormones are synthesized by smooth endoplasmic reticulum. Of the above statements

A. (i) and (iii)

B. (iii) and (iv)

C. (ii) and (iv)

D. (i) and (iv)

What is the correct answer?

4

Plastids are found in

A. all animal cells.

B. some animal cells.

C. all plant cells.

D. all plant cells and euglenoides.

What is the correct answer?

4

Which of the following statements are correct ?
  1. In prokaryotic cells, a special membranous structure formed by the extension of the plasma membrane into the cell is known as polysome.
  2. The smooth endoplasmic reticulum is the major site for synthesis of glycoproteins.
  3. RuBisCO is the most abundant protein in the whole biosphere.
  4. Mitochondria, chloroplasts and peroxisomes are not considered as part of endomembrane system. Of the above statements

A. (iii) and (iv)

B. (i) and (ii)

C. (ii) and (iii)

D. (i) and (iv)

What is the correct answer?

4

Cell sap is a

A. living content of cytoplasm.

B. nonliving content of cytoplasm.

C. nonliving content of vacuole.

D. living content of vacuole.

What is the correct answer?

4

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. A Plasma membrane, B Interdoublet bridge, C Central microtubule, D Radial spoke

B. A Plasma membrane, B Arm, C Central microtubule, D Radial spoke

C. A Plasma membrane, B Interdoublet bridge, C Hub, D Radial spoke

D. A Plasma membrane, B Interdoublet bridge, C Hub, D Arm

What is the correct answer?

4

Polysome is a chain of

A. oxysomes

B. sphaerosomes

C. ribosomes

D. dictyosomes

What is the correct answer?

4

The fluidity of membranes in a plant in cold weather may be maintained by

A. increasing the number of phospholipids with unsaturated hydrocarbon tails.

B. increasing the proportion of integral proteins.

C. increasing concentration of cholesterol in membrane.

D. increasing the number of phospholipids with saturated hydrocarbon tail.

What is the correct answer?

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.

What is the correct answer?

4

Which one of the following combination is mismatched?

A. Glycocalyx May be capsule or slime layer

B. Pili Reproduction

C. Cell wall Protective, determines shape, prevents from bursting

D. Flagella, pili and fimbriae Surface structures of bacterial cell

What is the correct answer?

4

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.

What is the correct answer?

4

Which of the following statement is correct regarding vacuole?

A. It is membrane-bound and contains storage proteins and lipids.

B. It is membrane-bound and contains water and excretory substances.

C. It lacks membrane and contains air.

D. It lacks membrane and contains water and excretory substances.

What is the correct answer?

4

Who proposed the theory that Cells arise only from the pre-existing cells?

A. Mohl

B. Virchow

C. Haeckel

D. Brown

What is the correct answer?

4

Select the incorrect statement about prokaryotic ribosomes.

A. 50S and 30S subunits unite to form 70S ribosomes.

B. Polysome/polyribosome consists of many ribosomes only.

C. Ribosome is the site of protein synthesis.

D. Polysome indicate the synthesis of identical poolypeptide in multiple copies.

What is the correct answer?

4

In which method of transport, plasma membrane does not require carrier molecule?

A. Active transport

B. Facilitated diffusion

C. Simple diffusion

D. Na+ K+ pump

What is the correct answer?

4

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)

What is the correct answer?

4

In which of the following the cells are held together by a Ca-pectate layer?

A. Primary cell wall

B. Secondary cell wall

C. Middle lamella

D. Tertiary cell wall

What is the correct answer?

4

Match the items given in column-I with their role given in column-II and choose the correct option.
Column-IColumn-II
A. SERI. Increase the surface area
B. Golgi apparatusII. Store oils or fats
C. CristaeIII. Excretion
D. PeroxisomeIV. Photorespiration
E. ElaioplastsV. Synthesis of lipid

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

B. A V; B III: C II; D IV; E I

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

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

What is the correct answer?

4

Which one of the following is not considered as part of the endomembrane system?

A. Golgi complex

B. Peroxisome

C. Vacuole

D. Lysosome

What is the correct answer?

4

Microtubules are absent in

A. mitochondria

B. centriole

C. flagella

D. spindle fibres

What is the correct answer?

4

Study the following statements on cilium or flagellum and answer the question.
  1. Cilium / Flagellum contains an outer ring of nine doublet microtubules surrounding two singlet microtubules.
  2. Cilia are smaller which work like oars, causing the movement of either the cells or surrounding fluid.
  3. Flagella are comparatively longer and responsible for cell movement.
  4. Cilium and flagellum are covered with plasma membrane.

Which of the above statements are correct?

A. (i) and (ii)

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

C. (i) and (iv)

D. (ii) and (iii)

What is the correct answer?

4

Identify the components labelled as A, B, C, D and E in the diagram given below from the list (i) to (viii).

  1. Cristae of mitochondria
  2. Inner membrane of mitochondria
  3. Cytoplasm
  4. Smooth endoplasmic reticulum
  5. Rough endoplasmic reticulum
  6. Mitochondrial matrix
  7. Ribosome
  8. Nucleus

A. A - (viii), B - (v), C - (vii), D - (iii), E - (iv)

B. A - (i), B - (iv), C - (vii), D - (vi), E - (iii)

C. A - (vi), B - (v), C - (iv), D - (vii), E - (i)

D. A - (v), B - (i), C - (iii), D - (ii), E - (iv)

What is the correct answer?

4

Match column-I (scientists) with column-II (discovery) and select the correct option.
Column-IColumn-II
A. LeeuwenhoekI. First saw and described a living cell
B. Robert BrownII. Presence of cell wall is unique to plant cells
C. SchleidenIII. Discovered the nucleus
D. SchwannIV. All plants are composed of different kind of cells

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

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

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

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

What is the correct answer?

4


Which function is carried out by the cell organelle 'X'?

A. helps control the movement of substance in and out of the cell

B. passes information from the parent cell to newly formed cell

C. maintains the proper shape of the cell and serves as a protective barrier

D. helps the cell to make food with the help of chlorophyll and sunlight

What is the correct answer?

4

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

What is the correct answer?

4

Select the statements which are related to Schwann.
  1. He reported that cells have a thin outer layer which is today known as plasma membrane
  2. Cell wall is a unique character of the plant cell.
  3. Body of plants and animals are composed of cells and products of cells.

A. Only (i)

B. Only (iii)

C. (i) and (iii)

D. All of these