Tag: prokaryotic cell and eukaryotic cell

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

Assertion:  Initiation step of protein synthesis in prokaryotes and eukaryotes has several differences.

Reason:  They both form mRNA - tRNA complex with smaller subunit of ribosome.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The differences between initiation step of protein synthesis in eukaryotes and prokaryotes are : 

(i) In prokaryotes initiation factors are three - IF1, IF2 and IF3. Eukaryotes have at least ten initiation factors - eIF1, eIF2, elF3, eIF4A, eIF4B, eIF4C, eIF4D, eIF4F, eIF5 and eIF6. 
(ii) In eukaryotes, formylation of methionine does not take place. In prokaryotes tRNA is charged with formylated methionine.
 (iii) The larger subunit of ribosome combines with 40S - mRNA - tRNAMet (in case of prokaryotes, 30S) complex to form intact ribosome. It requires initiation factor IF1 in prokaryotes and factors eIF1, eIF4 (A, B, C) in eukaryotes.

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

In eukaryotic cell,

  1. A spindle apparatus is produced during nuclear division.

  2. A spindle apparatus is not formed during division.

  3. Gametes are not formed

  4. Ribosomes are of 70S type
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The spindle apparatus (or mitotic spindle) refers to the cytoskeletal structure of eukaryotic cells that forms during cell division to separate sister chromatids between daughter cells. It is referred to as the mitotic spindle during mitosis, a process that produces genetically identical daughter cells, or the meiotic spindle during meiosis, a process that produces gametes with half the number of chromosomes of the parent cell.

So, the correct answer is 'A'.
Multiple choice biology organization of life comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

Which of the given structures of prokaryotes, resemble in composition to that of eukaryotes?

  1. Cell wall

  2. Cell membrane

  3. Ribosomes

  4. Both (2) and (3)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Both prokaryotic and eukaryotic cells have a cell membrane, a double layer of lipids that separates the cell interior from the outside environment. This double layer consists largely of specialized lipids called phospholipids.
Thus, the correct answer is 'Cell membrane.'
Multiple choice biology organization of life comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

The division of the plant kingdom into prokaryota and eukaryota is based on the characters of 

  1. Nucleus only

  2. Chromosomes only

  3. Cell organelles only

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

The primary distinction between a prokaryotic cell and a eukaryotic cell is based on the nucleus. Hence, a cell having a 'pro' or primitive nucleus is called as prokaryotic, where the word 'karyon' means nucleus. Similarly, the cells with the advanced or well-developed nucleus are called as eukaryotic, where the word 'karyon' means nucleus. A prokaryotic cell also lacks membrane-bound cell organelles like chloroplast, mitochondria, Golgi bodies. etc., which are a characteristic of eukaryotic cell.

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

Lowest number of chromosomes is found in

  1. Radiolaria

  2. Amoeba

  3. Ascaris meglocephala

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

Ascaris meglocephala (horse round worm ) has chromosome number 2n = 2. 

Amoeba has chromosome number 2n = 12. 
The maximum numbers of chromosomes is found in a protozoan (Radiolarian), where total number of chromosomes are 1600 i.e. 2n = 1600.

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

Statement I : All prokaryotes have a cell wall, eukaryotes do not.
Statement II : Prokaryotes have a true nucleus, eukaryotes have a primitive nucleus.

  1. Both statement I and statement II are true and statement II is the correct explanation of statement I.

  2. Both statement I and statement II are true but statement II is not the correct explanation of statement I.

  3. Statement I is true but statement II is false.

  4. Both statement I and statement II are false.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Prokaryotes generally have a tough layer which helps to maintain the strength and rigidity of the cells known as the cell wall. All the prokaryotes do not possess cell walls such as Mycoplasma. Eukaryotes like animals lack cell walls it starts with plasma membrane while plants have a cell wall.
Prokaryotes have a primitive nucleus that lacks membrane while eukaryotes have a true nucleus that has a double membrane nucleus. Thus, the correct answer is option D.
Multiple choice biology organization of life comparison of prokaryotic vs eukaryotic cells prokaryotic cell and eukaryotic cell types of cell

Prokaryotic and eukaryotic flagella differ in

  1. Type of movement and position

  2. Microtubular organisation and function

  3. Location and mode of functioning

  4. Microtubular organisation and type of movement.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Prokaryotic and eukaryotic flagella have the same function in the organism. They both are located on the cell membrane. However, they differ in their structure and dynamics. Eukaryotic flagella are microtubule-based structures. They are attached to the cell at the cell membrane by basal bodies. Prokaryotic flagella are located outside of the plasma membrane. Prokaryotic flagella show rotatory movement. Whereas eukaryotic flagella show lashing movement. The movement of prokaryotic flagella is proton-driven whereas the movement of eukaryotic flagella is ATP driven. Eukaryotic flagella show 9 + 2 microtubules arrangement.

Thus, the correct answer is option D.