Tag: the cell structure

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Multiple choice botany caskets of life the cell structure cytoplasm unicellular and multicellular organisms number and shape of cells diversity and classification in animals cell parameters

Hybridoma cells are

  1. nervous cells of frog

  2. hybrid cells resulting from myeloma cells

  3. only cells having oncogenes

  4. product of spore formation in bacteria.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hybridoma cells are created by fusing a B-lymphocyte (antibody-producing cell) with a myeloma cell (cancerous cell). This fusion allows the resulting cells to produce specific antibodies indefinitely.

Multiple choice biology caskets of life the cell structure cytoplasm unicellular and multicellular organisms

Choose the correct answers from the alternatives given.
Slime molds have:

  1. pseudoplasmodia

  2. feeding stages consisting of solitary, individual cells

  3. spores that develop into free-living amoeboid cells

  4. spores that develop into flagellated gametes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The haploid spores are produced from the mass by meiosis, these spores are developed or germinated into flagellated gametes. 

So, the correct option is 'spores that develop into flagellated gametes'.

Multiple choice biology caskets of life the cell structure cytoplasm unicellular and multicellular organisms

To observe Amoeba and Paramecium in a water drop, the drop was taken on a glass slide. If both the organisms were clearly seen, then the stain used must be ________.

  1. Methylene blue

  2. Iodine

  3. Safranin

  4. Eosin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Microorganisms can be observed under microscope using particular stain. To observe Amoeba and Paramecium in a water drop, the drop was taken on a glass slide. If both the organisms were clearly seen, then the stain used must be Methylene blue or thionin. Both these stains are LTP, that is Lipid transfer protein. They are used to observe animal cells like amoeba and paramecium through hybridization membranes like water. This stain makes the nucleus of amoeba and paramecium visible under microscope.

Thus, the correct answer is 'Methylene blue.'

Multiple choice biology caskets of life the cell structure cytoplasm unicellular and multicellular organisms

Choose the correct answers from the alternatives given.
Which one of the following protists is not correctly linked to the type of movement it shows?

  1. Amoeboids-pseudopodia

  2. Ciliates-cilia

  3. Zooflagellates-flagella

  4. Sporozoa-flexing the pellicle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sporozoa do not have flagella, cilia, or pseudopodia and they show gliding movement, amoeboids show movement by pseudopodia, ciliates by cilia and zooflagellates show by flagella, the pellicle is shown by paramecium.

So, the correct option is 'Sporozoa-flexing the pellicle'.

Multiple choice botany living world of animals number and shape of cells unicellular and multicellular organisms diversity and classification in animals the cell structure cytoplasm cell parameters

Which of following organisms can be seen only under the microscope?

  1. Unicellular

  2. Multicellular

  3. Vertebrates

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Most unicellular organisms are of microscopic size and are thus classified as microorganisms, for example, Phytoplankton and protozoa range from about 0.001 mm to about 0.25 mm.
  • Most of the multicellular organisms and vertebrates are visible to the naked eye, which means that it is possible to view them without using the microscope.
    So, option A is the correct answer.
Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

The term cytoskeleton was given by

  1. Koltzoff

  2. Rhodin

  3. Menke

  4. Park
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Cytoskeleton refers to the complex network of interlinking filaments and tubules which extend throughout the cytoplasm of the cell from the nucleus to the plasma membrane.
  • They are composed of microtubules, actin filaments and intermediate filaments. 
  • They give shape and support to the cell and also facilitates movement within the cell (cytoplasmic streaming or cyclosis).
  • It was discovered by Nikolai K. Koltsov in the year 1903.
  • So, the correct answer is 'Koltzoff'.
Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

Cytokinesis is a division of:

  1. Cytoplasm

  2. Nucleus

  3. chromosomes

  4. Nucleolus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cytokinesis is the process of division of Cytoplasm. "Kinesis" means division and "cyto" refers to cytoplasm. it occurs during cell division. It is variable from plant cells to animal cells.

So, the correct option is 'Cytoplasm'.

Multiple choice biology organization of life the cell structure cytoplasm number and shape of cells

 Select the correct statement _________________________.

  1. Histone protein is present in all prokaryotes but absent in animal cell

  2. ER is absent in eukaryotes but presents in prokaryotes

  3. Nuclear membrane is absent in prokaryotes but nuclear membrane is present in eukaryotes

  4. Ribosome is present in eukaryotic cells but absent in prokaryotic cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Nucleus is well defined in eukaryotes and nuclear membrane is present.
Histone proteins and endoplasmic reticulum (ER) are present in eukaryotes. Ribosomes are present in both eukaryotes and prokaryotes.
Hence, the correct answer is 'Nuclear membrane is absent in prokaryotes but nuclear membrane is present in eukaryotes'.