Tag: biology

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Questions Related to biology

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

Enzyme catalysed reactions can be inhibited by

  1. $Mg^{2+}$
  2. $Cu^{2+}$
  3. $Hg^{2+}$
  4. $Zn^{2+}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heavy metals like mercury (Hg2+) act as non-competitive or irreversible inhibitors by binding to the sulfhydryl groups of enzymes, thereby denaturing them or blocking their active sites.

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

Plants obtain mineral nutrients from.

  1. Rocks

  2. Breakdown products of rocks

  3. Soil

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

Plants obtain minerals from the soil, which are derived from the weathering and breakdown of rocks. Therefore, all these sources contribute to the mineral content available to plants.

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

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
  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-$5$
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology mineral nutrition in plants nutrients and nutrition essential and non-essential mineral elements transport in the xylem of plants

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

  1. Contains proteins

  2. Contains vitamins and carbohydrates

  3. Contains folic acid and amino acids

  4. Is rich in proteins and minerals
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mushrooms are often called 'vegetable meat' because they contain a significant amount of protein, making them a good plant-based protein source.

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

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.

  1. (i) and (ii)

  2. (iv) only

  3. (iii) only

  4. (i), (ii) and (iv)
Reveal answer Fill a bubble to check yourself
A Correct answer
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)'.

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

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

  1. Chromatin material present

  2. Cell wall present

  3. Nuclear membrane present

  4. Membrane-bound subcellular organelles present
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

Endoplasmic reticulum is absent in 

  1. Animal cells

  2. Prokaryotes

  3. Plant cells

  4. Protista and fungi
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 

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

Difference between eukaryotes and prokaryotes is in

  1. Circular ssDNA in prokaryotes

  2. Histone with prokaryotic DNA

  3. Operon in eukaryotes

  4. Membrane bound organelles in eukaryotes
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

The main difference between eukaryotes and prokaryotes is___________ 

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.