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Current Affairs January 2024

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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

Correct Answer :

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


All the statements are correct.

Related Questions

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Extension of plasma membrane in prokaryotic cell is

A. mesosome

B. haploid

C. ribosome

D. none of these

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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.

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Choose the incorrect match.

A. Nucleus RNA

B. Lysosome Protein synthesis

C. Mitochondria Respiration

D. Cytoskeleton Microtubules

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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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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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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.

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Integral proteins of cell membrane occur on/in

A. inner surfaces

B. outer surfaces

C. phospholipid matrix

D. inner and outer surfaces

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Which of these is wrongly matched?

A. Chloroplasts Chlorophyll

B. Elaioplasts Starch

C. Chromoplasts Carotenoids

D. Amyloplasts Carbohydrates

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4

Given below are some characters of a cell organelle identify the correct organelle which shows all the characters described above.
  1. It is a membrane bound space found in the cytoplasm.
  2. It is bound by a single membrane called tonoplast.
  3. It contains water, sap, excretory products and other materials not useful to the cell.
  4. It has higher concentration of sap than the cytoplasm.

A. Golgi apparatus

B. Lysosomes

C. Endoplasmic reticulum

D. Vacuoles

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A component of cytoskeleton is

A. microtubule

B. bone

C. chitin

D. cartilage.

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Which of the following statements is/are correct ?
  1. The endomembrane system includes plasma membrane, ER, Golgi complex, lysosomes and vacuoles.
  2. ER helps in the transport of substances, synthesis of proteins, lipoproteins and glycogen.
  3. Ribosomes are involved in protein synthesis.
  4. Mitochondria help in oxidative phosphorylation and generation of ATP.

A. (ii), (iii) & (iv)

B. (i) only

C. (ii) only

D. (iii) only

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pH of vacuolar cell sap is

A. neutral and isotonic.

B. alkaline and isotonic.

C. acidic and hypertonic.

D. equal to cytoplasm and isotonic.

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Select the correct match of the types of neuron present in column I with its location given in column II.
Column IColumn II
A. Centrioles(i) Non-membrane bound organelle which helps in cell division
B. Fimbriae(ii) Special structure of bacteria which help them to attach with rocks in stream and also to host tissue
C. Endomembrane(iii) Includes those organelles system whose functions are coordinated
D. Mitochondria(iv) Divide by fission and site of aerobic respiration

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

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

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

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

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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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Lysosomes contain

A. carbohydrates

B. hormones

C. nucleic acids

D. hydrolases.

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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.

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Chromosomes having equal or almost equal arms are called

A. metacentric

B. acrocentric

C. polycentric

D. acentric.

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Which of the following will determines the shape of the cells and provides a strong structural support to prevent the bacterium from bursting or collapsing?

A. Plasmids

B. Cell wall

C. Mesosome

D. Cell membrane

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Membranous extensions in blue green algae are known as

A. phytochrome

B. chromatophore

C. mesosome

D. pneumatophore

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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

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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.

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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)

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4

Read the folowing statements and identify the correct option.
  1. Contractile vacuole takes part in osmoregulation and excretion.
  2. Food vacuole is formed by engulfing the food particles.
  3. The vacuole is bound by a double membrane called tonoplast.
  4. Vacuole can occupy upto 90 percent of the volume of the cell.

A. (i) and (ii)

B. (ii) and (iv)

C. (i), (ii) and (iv)

D. None of the above

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Protein synthesis in an animal cell occurs

A. on ribosomes present in cytoplasm as well as in mitochondria.

B. on ribosomes present in the nucleolus as well as in cytoplasm.

C. only on ribosomes attached to the nuclears envelope and endoplasmic reticulum.

D. only on the ribosomes present in cytosol.

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4

Which of the following pair are correctly matched.
A. Microtubules Structural components of cilia
B. Centrioles Store hydrolytic enzymes
C. Amyloplasts Store oil protein and starch in plants

A. A, B and C

B. A and B

C. A

D. A and C

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Golgi apparatus is concerned with

A. excretion

B. secretion

C. ATP synthesis

D. RNA synthesis

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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

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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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The cytoskeleton is a proteinaceous network of fibres in the cytoplasm. It is involved in

A. mechanical support.

B. motility.

C. maintenace of cell-shape.

D. all of the above

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Basal bodies are associated with the formation of

A. phragmoplast

B. cilia and flagella

C. cell plate

D. kinetochore