Tag: cell as structural and functional unit

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Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The branch of biology dealing with structures, function and reproduction of cell is

  1. Physiology

  2. Anatomy

  3. Histology

  4. Cell Biology
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cell biology is a scientific study of the cells. It is concerned with the physiological properties, structure, the organelles it contains, interactions with the environment, life cycle, division and death of the cell. It is associated with the morphological and molecular level of the cell.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Which of the following is not correct?

  1. Robert Brown discovered the cell.

  2. Schleiden and Schwann formulated the cell theory.

  3. Virchow explained that the cells are formed from pre-existing cells.

  4. A unicellular organism carries out its activities within a single cell.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Robert Brown discovered the nucleus. He discovered the presence of nucleus in the cells of orchid root. Nucleus is a specialized double membrane bound protoplasmic body which contains all the genetic information for controlling cellular metabolism. 

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Indicate weather the statement is true of false :
Robert Hook discovered the nucleus.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Robert Hooke was mathematician and physicist. He discovered the cell. He took a piece of spanish oak and prepared thin slice by means of sharp pen knife. A deep planoconcave lens was used for throwing light on cork piece. The latter was observed under the microscope. The piece of cork was found to have a honey comb structure with a number of box like compartments, each having a pore and separated from others by diaphragms. Robert Hooke named the compartments as cellulae, now known as cells.
Nucleus was discovered by Robert Brown. He discovered the presence of nucleus in the cells of orchid root. Nucleus is a specialized double membrane bound protoplasmic body which contains all the genetic information for controlling cellular metabolism and transmission to the posterity.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The unit of measurement used for expressing dimension (size) of cells is

  1. Centimeter

  2. Millimeter

  3. Micrometer

  4. Meter
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The majority of cells are small. Normal animal cell size varies from 10 to 30 micrometer, while plant cell stretches from 10 to 100 micron. 

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

What is the structural and functional unit of living organisms?

  1. Tissue

  2. Cell

  3. Organ

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cells are called the structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells. Cells provide specific conditions, for the occurrence of the metabolic reactions. These have specialized enzymes, which catalyze the biochemical reaction and regulates the functions of the body.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Which of the following is not a cell?

  1. Red Blood Corpuscle (RBC)

  2. Bacterium

  3. Spermatozoa

  4. Virus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Virus is an acellular microscopic infection-causing agent. It has only protein cover and a nucleic acid (either DNA or RNA). These are intracellular parasites that depend upon the host for nutrition.
Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The ______ is the basic structural and functional unit of life.

  1. Tissue

  2. Organ

  3. Cell

  4. Organelle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cell is the basic structural and functional unit of life. Whether it is a complex organism like humans, animals or plants or simple organisms like the bacteria, they are all made of cells. So, the cell forms the most basic level of organization of organisms.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The shape of the cell is related to

  1. the habitat of the organism

  2. the body size of the organism

  3. the function it performs

  4. the number of cells in an organism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

There is a direct correlation between the shape of the cell and the function it performs. For example, the Red Blood Cells (RBCs) have a biconcave disc-shaped structure because they have to squeeze through blood capillaries to deliver oxygen to the various parts of the body. If the RBCs had any other shape, it would be difficult to perform the same function efficiently.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Cells were determined to be the basic structural units of plants and animals, in which of the following time period?

  1. 1600's

  2. 1700's

  3. 1800's

  4. 1900's
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • The cell was discovered by Robert Hook in 1665. But the statement that cell is the structural and functional unit of life generalized as cell theory in 1839 by Schleiden and Schwann. Thus, the correct answer is option C.