Tag: unicellular and multicellular organisms

Questions Related to unicellular and multicellular organisms

Efficient large-sized cells should be_________.

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. Elongated.

  2. Branched.

  3. With membrane extensions.

  4. Any of the above.

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Correct Option: D

Size of Acetobularia is

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. $10cm$

  2. $10mm$

  3. $1.0mm$

  4. $0.1mm$

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Correct Option: A
Explanation:

Acetabularia is a single-celled eukaryotic photosynthetic green alga. Although it is single cells it has a complex structure with size varying from 0.5-10cm. It is divided into three anatomical parts with basal rhizoid like structure resembling roots, long stalk-like structure and top umbrella that may fuse to form the cap.  

Which of the following statement are false?
(a) Most cells are tiny with volume range of $1-100$ $n{m}^{3}$
(b) Some cells have microvelli to increase the absorptive surface area.
(c) All cells arise from pre-existing cells.
(d) In plants, translocation of solutes is performed by xylem vessels and tracheids.
(e) According to cell theory, all cells arise from abiotic material.

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. a), c) and e) are false.

  2. a), d) and e) are false.

  3. b), c) and d) are false.

  4. c), d) and e) are false.

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Correct Option: B

Assume a spherical mammalian cell has a diameter of 27 microns. If a polypeptide chain with alpha helical conformation has to stretch across the cell, how many amino acids should it be comprised of?

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. 18000

  2. 1800

  3. 27000

  4. 12000

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Correct Option: A

A distinguishing feature of latex cells is that they are

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. Single celled elements with anastomosing branches

  2. Single celled elements with nonanastomosing branches

  3. Multicelled elements with anastomosing branches

  4. Multicelled elements with nonanastomosing branches.

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Correct Option: B

Which amongst the following is more complex in body plan, from evolution point of view?

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. Bacteria

  2. Human

  3. Both have same complexity

  4. Data insufficient

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Correct Option: B
Explanation:

If the appearance of complexity is concurrent with evolution then, human beings are more evolved and complex than bacteria. Humans are the multicellular organism with the well-developed brain. Bacteria is the primitive unicellular organism.

safranin stains

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. Thick walled cells

  2. Lignified cells

  3. Suberized cells

  4. LIving cells

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Correct Option: B
Explanation:

Safranin is a biological stain composed of azonium compounds, which is utilized to study histology and cytology. In particular, safranin stains lignified tissues like xylem even in the presence of cellulose particles. Fluorescent safranin staining is useful to stain the cell wall of woody plants and produce green or yellow fluorescence in the secondary cell wall and red or orange fluorescence in the middle lamella region under a fluorescent microscope. 

So, the correct answer is option B, Lignified cells. 

The longest living cells amongst the following are

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. RBC

  2. B cells

  3. T cells

  4. Neurons

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Correct Option: D
Explanation:

All cells usually have a fixed life span. The cells divide for a certain period of time, after which they die. This has been explained by the phrase "programmed cell death". The lifespan of each type of the body cells differ and it depends on the function it is destined to perform. Neurons are long lived and are generally non-mitotic. Memory T cells and memory B cells can provide long lasting immunity from exposure to antigens, they too are long lasting but their life span is less than that of a neuron.

The lifespan of RBC is shortest amongst the options which are given, it is 115 days. Thus, the correct answer is option D.

PPLO is the smallest cell.

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. True

  2. False

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Correct Option: A
Explanation:

PPLO is pleuropneumonia-like organisms. It has the diameter of 0.1 micrometer. It is the smallest known cell. 

The largest cell measuring .........., is the egg of an ostrich.

biology cell-the basic unit of life number and shape of cells unicellular and multicellular organisms cell parameters diversity and classification in animals

  1. 130 mm-150 mm

  2. 130 mm-180 mm

  3. 130 mm-170 mm

  4. 170 mm-190 mm

Show answer
Correct Option: C
Explanation:

The cell is the structural unit of life and its size ranges from 0.5 micrometers to 100 micrometers. An egg of ostrich is a single-celled structure and know as the largest cell in the world with the size of 130 mm-170 mm. Thus, the correct answer is option C.