Tag: biology

Questions Related to biology

Enzyme catalysed reactions can be inhibited by

biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants

  1. $Mg^{2+}$

  2. $Cu^{2+}$

  3. $Hg^{2+}$

  4. $Zn^{2+}$

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Correct Option: C

Plants obtain mineral nutrients from.

biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants

  1. Rocks

  2. Breakdown products of rocks

  3. Soil

  4. All the above

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Correct Option: D

Match List I(Element) with List II(Process) and select the correct answer.

List I List II
a. Molybdenum $1$. Photosynthesis
b. Manganese $2$. Respiration
c. sulphur $3$. Nitrate reduction
d. Calcium $4$. Cell division
$5$. Protein synthesis
biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants

  1. A-$5$, B-$2$, C-$3$, D-$1$

  2. A-$3$, B-$1$, C-$5$, D-$4$

  3. A-$2$, B-$1$, C-$4$, D-$5$

  4. A-$3$, B-$2$, C-$4$, D-$5$

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Correct Option: A

Mushroom is referred to as a vegetable meat because it _________________.

biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants

  1. Contains proteins

  2. Contains vitamins and carbohydrates

  3. Contains folic acid and amino acids

  4. Is rich in proteins and minerals

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Correct Option: A

Plants detoxify heavy metals by means of.

biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants

  1. Allelopectins

  2. Abscisic acid

  3. Phytolexins

  4. Phytochelatins

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Correct Option: D

Which of these statements is/are true?


(i) The surface area available for cellular functions in a prokaryotic cell is less than that in a eukaryotic cell.
(ii) The total genome size of a prokaryotic cell is always less than that of a eukaryotic cell.
(iii) Unlike eukaryotes, no special respiratory organelles are found in prokaryotes. Hence they respire at a much less rate than eukaryotes.
(iv) Eukaryotic cells show various membrane-bound organelles such as chloroplasts and nucleus while ribosomes are the only membrane-bound organelles found in prokaryotes.

biology organization of life comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

  1. (i) and (ii)

  2. (iv) only

  3. (iii) only

  4. (i), (ii) and (iv)

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Correct Option: A
Explanation:

The cellular and genomic organisation of prokaryotes are fundamentally different from that of eukaryotes. 

  • Prokaryotic cells have a small, simple structure compared to eukaryotic cells. They have less surface area per volume. Prokaryotes have simpler and smaller genomes than eukaryotes. In the majority of prokaryotes, the genome consists of a ring of DNA with few associated proteins. 
  • The eukaryotic genome is larger, organised into chromosomes, and is complexed with histone proteins. 
  • Unlike eukaryotes, prokaryotes do not have membrane-bound organelle for respiration but many enzymes needed for cellular respiration are attached to the plasma membrane, which may fold and extend into the cell. Ribosomes are the only cytoplasmic organelles in prokaryotes and they are not membrane-bound.
So, the correct answer is '(i) and (ii)'.

Which of the following features is common to prokaryotes and many eukaryotes?

biology organization of life comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

  1. Chromatin material present

  2. Cell wall present

  3. Nuclear membrane present

  4. Membrane-bound subcellular organelles present

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Correct Option: B
Explanation:

Cell wall is found in bacteria (prokaryotes), fungi, algae and plants (eukaryotes). Bacterial cell walls are made up of peptidoglycan (murein). Algal cell walls are made up of gylcoproteins and polysaccharides. The cell walls of fungi are composed of chitin. Plant cell walls consists of a variety of polysaccharides, lipids, proteins etc. Prokaryotes lack nuclear membrane, and membrane bound subcellular organelles. Genetic material is naked and is called nucleoid.

So, the correct answer is 'Cell wall'.

Endoplasmic reticulum is absent in 

biology cell and cellular organization comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

  1. Animal cells

  2. Prokaryotes

  3. Plant cells

  4. Protista and fungi

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Correct Option: B
Explanation:

Prokaryotic cells are primitive cells. They do not possess many membrane bound organelles as endoplasmic reticulum, mitochondria, lysosomes etc. Therefore, option B is correct. 

Difference between eukaryotes and prokaryotes is in

biology cell and cellular organization comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

  1.  Circular ssDNA in prokaryotes

  2.  Histone with prokaryotic DNA

  3. Operon in eukaryotes

  4. Membrane bound organelles in eukaryotes

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Correct Option: D
Explanation:

On the basis of the structure of cells, organisms are classified as eukaryote and prokaryote. The main differentiating factor between a eukaryote and prokaryote is that the cell organelles of eukaryotic cells are membrane-bound, while that of others are not.
Hence, the correct answer is D.

The main difference between eukaryotes and prokaryotes is___________ 

biology cell and cellular organization comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

  1. Eukaryotes have nucleus and prokaryotes have nucleoid.

  2. Eukaryotes have nucleoid and prokaryotes have nucleus.

  3. Eukaryotes have cell membrane, prokaryotes do not have cell membrane.

  4. All of the above.

Show answer
Correct Option: A
Explanation:
Prokaryotes do not possess membrane bound organelles and well defined nucleus. Nucleoid is a region in prokaryotic cell where its most of the genetic material resides. It is not a well-defined membrane bounded region. 
Eukaryotes possess well defined nucleus and membrane bound organelles as mitochondria, Golgi complex, etc. Nucleus is bound with double membrane in eukaryotic cell in which most of the genetic material is present. 
Therefore, the correct answer is option A.