Tag: organization of life

Questions Related to organization of life

Which of the following is a catabolic reaction?

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. Intercellular digestion

  2. Intracellular digestion

  3. Respiration

  4. All of the above

Show answer
Correct Option: D
Explanation:

The catabolic processes are the reactions in which the large complex molecules are broken down to form the smaller molecules. The process is an exergonic process in which the energy is released due to the breaking of the bonds of the larger complex molecules. Intracellular digestion refers to the breaking of the larger molecules. Intercellular digestion is the processes in which the molecules are broken down outside the cell and then absorbed. During internal respiration, there is the breakdown of the molecules to produce ATP. 

Thus, the correct answer is option D. 

Choose the correct answers from the alternatives given .
All the chemical energy transformations that occur within a cell is called

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. metabolism

  2. adaptation

  3. homeostasis

  4. photosynthesis

Show answer
Correct Option: A
Explanation:
Metabolism is the set of life-sustaining chemical processes that enable organisms to transform the chemical energy stored in molecules into energy that can be used for cellular processes.
So, the correct option is 'metabolism'

State whether the following statements are true or false .
A metabolic pathway is a sequence of chemical reactions in which each step is controlled by its own specific enzymes.

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Enzymes are organic catalysts which aid in facilitating chemical reactions in the body. Each metabolic pathway consists of a series of biochemical reactions that are connected by their intermediates: the products of one reaction are the substrates for subsequent reactions, and so on. Any metabolic pathway inside our body (for example glycolysis) requires several enzymes working in a sequential manner. 

So, the correct option is 'True'.

Which of the following is not metabolised in human body and therefore, used in determining glomerular filtration rate?

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. Insulin

  2. Inulin

  3. Cellulose xanthate

  4. Toxic ketones

Show answer
Correct Option: B
Explanation:

Inulin is an indicator of GFR because, it is neither reabsorbed into the blood after filtration nor secreted through peritubular capillaries, amount of inulin cleared through the urine is indicative of the amount of plasma filtered by body's glomeruli.

So, the correct option is 'Inulin'.

How many features listed below are exhibited by flatworms (A) and bacteria (B)?


(i) Growth by increases in mass only
(ii) Regeneration
(iii) Self-consciousness
(iv) Anabolism and catabolism
(v) Binary fission

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. A - (i,ii,iii,iv) B- (i, iii, iv)

  2. A - (ii,iv) B- (iv, v)

  3. A - (ii,iii,iv) B- (i, iv, v)

  4. A - (i,ii) B- (iii, iv, v)

Show answer
Correct Option: B

It is much easier for a small animal to run uphill than for a large animal, because - ?

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. small animals have lower $O _2$ requirement

  2. the efficiency of muscles in larger animal is less than in smaller animal

  3. it's easier to carry a small body weight

  4. smaller animals have higher metabolic rate

Show answer
Correct Option: D
Explanation:
It has been observed that the metabolic rate of an organism is inversely proportional to its body weight, that is smaller animals have a higher metabolic rate. This higher metabolic rate allows them to have higher energy and are quicker in climbing heights as compared to larger animals.

So, the correct answer  is 'smaller animals have higher metabolic rate'.

Choose the correct answers from the alternatives given .
All the biochemical pathways in a cell constitute

bio-chemistry organization of life concept of metabolism metabolism in animals metabolism

  1. Coupling reactions

  2. Endergonic reactions only

  3. Exergonic reactions only

  4. Metabolism

Show answer
Correct Option: D
Explanation:

There are various biochemical reactions taking inside a cell. Some of these reactions may result in absorption of energy (called as endergonic reactions) or release of energy (called as exergonic reactions). Often both these types of reactions are coupled, to get the energy to those endergonic reactions, they are paired up with energy-releasing exergonic reactions (known as coupling reactions). Although, there are a wide variety of reactions taking place inside the body apart from these reactions. Metabolism is a term that is used to describe all these biochemical reactions involved in maintaining the living state of the cells and the organism. 

So, the correct option is 'Metabolism'.


The term cytoskeleton was given by

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

  1. Koltzoff

  2. Rhodin

  3. Menke

  4. Park

Show answer
Correct Option: A
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'.

Cytokinesis is a division of:

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

  1. Cytoplasm

  2. Nucleus

  3. chromosomes

  4. Nucleolus

Show answer
Correct Option: A
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'.

 Select the correct statement _________________________.

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

  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

Show answer
Correct Option: C
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'.