Biology · Science General

Cell Biology and Structure

3,221 Questions

Cell biology focuses on the structure and function of cellular organelles. Key topics include cellular respiration, DNA inheritance, and energy production. These fundamental biology concepts are crucial for medical entrance and state service examinations.

Cell organelles functionsCellular respiration sitesDNA and ribosomesAnimal cell structurePlant cell components

Cell Biology and Structure Questions

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'.

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 size of the cell is not related to the size of the body of an animal.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The size of cell of an organism has no relation with the size of its body. The size of the cell does not matter. It is always the number of cells. If the organism is unicellular, it is very microscopic. If it is multicellular, as the cell number increases, the size of the organism will also increase. 
Thus, the correct answer is 'True.'
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 ratio of inorganic matter to organic matter in the cell is 

  1. Variable

  2. 1:9

  3. 9:1

  4. 10:5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In typical biological cells, the ratio of inorganic matter to organic matter is generally accepted as 1:9, reflecting the high concentration of organic compounds like proteins and lipids.

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

Cell is called as the structural and functional units of life because_________

  1. All organisms are formed of cells.

  2. All cells are biochemical reaction house.

  3. ATP is synthesized within cells.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D 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 the specialized enzymes, which catalyze the biochemical reaction and regulates the functions of the body such as respiration (formation of ATP in the cell)
So, the correct answer is option D.

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

.......... is the basic unit of life.

  1. Cell

  2. Tissue

  3. System

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

Cells are called as the basic 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 the specific conditions, for the occurrence of the metabolic reactions. These have the 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

Cells are able to live and perform its functions due to the presence of_________________

  1. Organelles

  2. Lysosomes

  3. Cell wall

  4. Ribosomes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The cell is the basic unit of life. All the living organisms are made up of cells and each cell performs a life-sustaining process. The cell is composed of the cell membrane, cytoplasm, nucleus, cell organelles and cell wall (except animal cells). An organelle is a distinct part of a cell, which has a particular structure and function. 
  • Each organelle performs a particular function. For example- mitochondria produce ATPs, lysosomes digest cellular waste and debris, centrioles separates chromosomes during cell division, Ribosome synthesizes proteins, cell wall protects, etc. 
  • Due to this, a cell can survive and perform its own functions. Thus, the correct answer is option A.
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

A cell is a building unit of an organism. Select the correct statements.

  1. In unicellular organisms, a single cell is capable of performing all the functions of life

  2. In multicellular organisms, a single cell is capable of performing all the functions of life

  3. Both A and B

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Cells are called the structural and functional unit of life because all the living organisms are made up of cells and perform all life process for survival. Unicellular organisms are made up of a single cell and single-cell only performs all the functions of life. Whereas multicellular organisms are made up of multiple cells and perform all the functions of life. Thus, the correct answer is option A.
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

Several tissues combine to form_________________

  1. Organ

  2. Organism

  3. Cell

  4. Cytoplasm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • A group of cells, which are structurally similar and work together to perform a particular function are called tissue. 
  • The collection of such tissues, which are joined in a structural unit to perform a certain function, is called an organ. Whereas cytoplasm is the living fluid in the cell. Thus, the correct answer is option A.
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

Each cell is amazing world in itself because 

  1. It can take in nutrients, converts these nutrients into energy.

  2. It carry out specialized functions.

  3. It can reproduce as necessary.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Cells are called an amazing world in itself 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. 
  • These have the specialized enzymes, which catalyze the biochemical reaction and regulates the specialized functions of the body such as the conversion of nutrients into the energy, reproduction in unicellular and division or replication in multicellular.
Thus, the correct answer is option D.

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

Mark the correct option

  1. Every living organism is made up of cells and organs

  2. Living organisms have capacity to divide

  3. Both A and B

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

Living organisations have capacity to reproduce for ex animals give both to young ones of their kind, either directly or through egg.

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

___________ are the non-living components of the cell.

  1. Lysosomes

  2. Vacuoles

  3. Nuclei

  4. Golgi bodies
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Cell inclusions are tiny droplets which contain stored nutrients, secretory products and pigment granules.
Eg- lipid droplets in fat cells, pigment granules in skin cells and hair cells, water-containing vacuoles.
Vacuoles are non-living cell inclusions present in the cytoplasm which contain inorganic and organic molecules.Each droplet is a small vacuole filled up with cell-sap. These small vacuoles enlarge and finally coalesce to give rise to a large vacuole.They are present in the form of minute droplets in the cytoplasm of the cells (small vacuole filled with cell sap).
So, the correct answer is 'Vacuoles'.
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

Cell is a unit of

  1. Structure.

  2. Function.

  3. Mass of protoplasm.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • A cell is a unit mass of protoplasm which is surrounded by protective and semi-permeable plasma membrane which separates the cell contents from the environment. 
  • It is the basic unit of life and carries out the different functions of life. The body of all organisms is made up of cells so it is the structural unit of life. 
  • Also, all the physiological, biochemical and genetic functions of the body are carried out by cells so it is called a functional unit of life. So, the correct answer is option D.
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 theory proposing that body of an organism consists of incompletely divided cells is known as

  1. Organismal theory.

  2. Protoplasmic theory.

  3. Cell theory.

  4. Theory of cell lineage.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The organismal theory posits that the body of an organism is a single continuous unit (a protoplasmic mass) that is incompletely divided into cells, rather than being a collection of independent 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 is correct about cell theory in view of current status of our knowledge about the cell structure?

  1. It needs modification due to discovery of subcellular structure like chloroplasts and mitochondria.

  2. Modified cell theory means that all living beings are composed of cells capable of reproducing.

  3. Cell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation.

  4. Cell theory means that all living objects consist of cells whether or not capable of reproducing.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Modern cell theory acknowledges that viruses, which lack cellular organization, are living entities, thereby challenging the original premise that all living beings must be composed of cells.