Tag: cell discovery and cell theory

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Questions Related to cell discovery and cell theory

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.

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

Auxospores are formed in the life cycle of diatoms these structure are ________________.

  1. Vegetuative cells with ploidy level N

  2. Asexual spores with ploidy level N

  3. Statosspores with 2N ploidy Level
  4. Sexual spores with ploidy level $2N$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Auxospores are formed by diatoms at an important stage of their life cycle. They are specialized cells which help the diatoms in regaining their normal size. After cell division in diatoms, each daughter cell inherits one of the two valves and hence results in reduction of size of the diatom, to retain the size diatoms produce auxospores and hence they are vegetative.
So, the correct option is, 'Vegetuative cells with ploidy level N'.
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 one of the following is incorrect for the members of chrysophyta?

  1. These are nonmotile bivalved organism

  2. Presence of primordial utricle around a central vacuole

  3. Resetve food materials are paramylon and volutin granules

  4. Movement occurs by mucilage propulsion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chrysophyta are motile. They sometime produce flagellated motile zoospores during reproduction. They are also bivalved.

Therefore the right answer is "These are nonmotile bivalved organism".

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 concept ''OMNIS cellula-e-cellala'' means that ,new cells are formed from:

  1. Non living materails

  2. Pre-existing living cells

  3. Dead organic matter

  4. As the results of chemical reaction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

"Omnis cellula e- cellula" means new cells are formed from pre-existing living cells. 

So the correct option is 'pre existing living cells'.

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 statement is false?

  1. Properties of cellular organelles are present in the molecular constituents of the organelles

  2. Interaction among the molecular components of the organelles results into properties of cell organelles

  3. Biology is the story of life on earth(formation, evolution and biodiversity)

  4. Biology is the life sciences dealing with every aspect of life
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A cell possesses several cellular organelles. Each of the organelle such as mitochondria, endoplasmic reticulum etc. have their own specific function in the cell. These organelles are composed of several molecules and ions such as proteins, lipids, calcium and magnesium ions etc. These molecules together help the organelles perform their specific function. However, when present outside the organelle or in a different organelle the same molecules may perform functions that are different. So, the correct option is 'Properties of cellular organelles are present in the molecular constituents of the organelles'.