Q: The prokaryotic cell does not have:

\$\textbf{Correct option:D}\$ \$\textbf{Solution:}\$\$\textbf{Option (A)}\$\$\bullet\$ Nucleolus is absent, rather the DNA that forms the major nuclear material is not membrane bound(naked) and coiled in the cytoplasm ,it is also known as genophore/nucleoid/prochromosone (single naked chromosome).\$\bullet\$ There is an additional circular DNA called plasmid which is a very important machinery for biotechnology , nitrogen fixation, resistance , fertility etc.\$\textbf{Option (B)}\$\$\bullet\$ Membrane bound organelles are absent in prokaryotic cells such as mitochondria,endoplasmic reticulum,lysosomes,golgi apparatus, microtubules,microfilaments and centrioles.\$\textbf{Option (C)}\$\$\bullet\$ Centrioles are minute microscopic microtubular cylindrical structures which can duplicate themselves ,producing astral poles and basal bodies without having DNA and a membranous converting . These structures are present in eukaryotic cells and plays a crucial role at the time of cell division.\$\textbf{Option (D)}\$\$\bullet\$ All the above option are correct.\$\textbf{Hence, the correct option is (D)}\$

Question 1

The smallest living cells with cell wall are _______.

Accepted Answer

Algae are the living cells which, have a cell wall composed of either polysaccharide (such as cellulose (a glucan)) or a variety of glycoproteins. But they are larger in size as compared to the bacterial cell.Bacteria is a unicellular prokaryotic organism possess prominent cell wall made up of peptidoglycans.Viroids consist solely of short strands of circular, single-stranded RNA without protein coats, it lacks a cell wall.&#10;&#10;&#10;&#9;&#10;&#9;&#10;&#9;&#10;&#9;&#10;&#10;&#10;Mycoplasma&#10;has&#10;plasma membrane as the outermost covering, it lacks a cell wall. So, the correct answer is 'Bacteria'.

Question 2

Which is not true about prokaryotes?

Accepted Answer

Prokaryotes lack a true nucleus with well defined nuclear membrane and other membrane-bound organelles. Mitochondria are the double membrane bound organelle and hence is absent in prokaryotes. Mesosome is an extension of the cell membrane presence in the cytoplasm as infolding and serves to increases surface area and as a site for cellular respiration in prokaryotes. Histones are positively charged proteins that serve in the packaging of negatively charged eukaryotic DNA but are absent in prokaryotes.So, the correct answer is option A.

Question 3

The prokaryotic cell does not have:

Accepted Answer

$\textbf{Correct option:D}$ $\textbf{Solution:}$$\textbf{Option (A)}$$\bullet$ Nucleolus is absent, rather the DNA that forms the major nuclear material is not membrane bound(naked) and coiled in the cytoplasm ,it is also known as genophore/nucleoid/prochromosone (single naked chromosome).$\bullet$ There is an additional circular DNA called plasmid which is a very important machinery for biotechnology , nitrogen fixation, resistance , fertility etc.$\textbf{Option (B)}$$\bullet$ Membrane bound organelles are absent in prokaryotic cells such as mitochondria,endoplasmic reticulum,lysosomes,golgi apparatus, microtubules,microfilaments and centrioles.$\textbf{Option (C)}$$\bullet$ Centrioles are minute microscopic microtubular cylindrical structures which can duplicate themselves ,producing astral poles and basal bodies without having DNA and a membranous converting . These structures are present in eukaryotic cells and plays a crucial role at the time of cell division.$\textbf{Option (D)}$$\bullet$ All the above option are correct.$\textbf{Hence, the correct option is (D)}$

Question 4

Which is concerned with autolysis?

Accepted Answer

Lysosomes are rich in a variety of hydrolytic enzymes or acid hydrolases.Autophagic lysosomes perform autophagy. Autophagy is dependent on hydrolytic enzymes. Lysosomes are important in metamorphosis, i.e., eating away larval organs, removal of obstructions, intracellular scavenging, osteogenesis, fertilization, etc.So, the correct answer is 'Lysosomes'

Question 5

Which one of the following is a prokaryote?

Accepted Answer

Salmonella is a bacteria which has unorganised nucleus without membrane and hence, it is a prokaryote. A bacteriophage is a virus and non-living particle. Agaricus is a fungus. Green algae are plants.So, the correct answer is option B.

Question 6

Single membrane bound organelles are

Accepted Answer

Eukaryotic cell has several membrane bound cell organelles. These cell organelles can be bound by a single or double membrane. Nucleus, plastids and mitochondria are bounded by double membrane whereas lysosomes, sphaerosome, glyoxysomes are bounded by a single membrane. Ribosomes are naked particles not bounded by any membrane. Thus, the correct answer is option D.

Question 7

Which structure is present in both prokaryotic and eukaryotic cells?

Accepted Answer

Unlike the eukaryotes, the prokaryotic organisms are devoid of membrane-bound organelles. Nucleus, chloroplast and mitochondria are membrane bound sub-cellular structures found in the eukaryotes only. Cell wall is found in the plants as well as bacterial cells, which are prokaryotes.Hence the correct option is A.

Question 8

The bright colours of ripe fruits are due to

Accepted Answer

Plastids are organelles found in plant cells. These are involved in the synthesis and storage of food. Plastids are of different types- (1) chloroplasts, (2) chromoplasts, (3) leucoplasts. Chromoplasts are plastids that are coloured due to the pigments that are produced and stored inside them that is not chlorophyll.They are found in fruits, flowers, roots, and senescent leaves and are responsible for their different colours.So the correct answer is option D.

Question 9

Intracellular compartments are not found in the cells of

Accepted Answer

Intracellular compartments are the membrane-bounded organelles present in the cytosol and separated from the extracellular compartment by the cell membrane. Prokaryotic cells are the primitive unicellular organism which has disorganized nucleus without a nuclear membrane and no membrane-bounded organelles. So, the correct answer is option B.

Question 10

Which of the following is a prokaryote?

Accepted Answer

Correct option: CExplanation:Bacteria are prokaryotic, single-celled organisms, which, belong to the kingdom Monera. The bacterial cell has coiled DNA in a region called nucleoid and is devoid of membrane-bounded organelles. Bacteria do not have an organized cellular structure.Amoeba is a unicellular eukaryote and belongs to the kingdom Protista.Spirogyra and Chlamydomonas are green algae and belong to the kingdom Plantae. They have a complex cellular structure with membrane-bounded organelles.So, the correct answer is option C.

Cell The Unit Of Life

Biology
3552 Views

The smallest living cells with cell wall are _______.

Which is not true about prokaryotes?

The prokaryotic cell does not have:

Which is concerned with autolysis?

Which one of the following is a prokaryote?

Single membrane bound organelles are

Which structure is present in both prokaryotic and eukaryotic cells?

The bright colours of ripe fruits are due to

Intracellular compartments are not found in the cells of

Which of the following is a prokaryote?

Cell The Unit Of Life

Biology 3552 Views

The smallest living cells with cell wall are _______.

Which is not true about prokaryotes?

The prokaryotic cell does not have:

Which is concerned with autolysis?

Which one of the following is a prokaryote?

Single membrane bound organelles are

Which structure is present in both prokaryotic and eukaryotic cells?

The bright colours of ripe fruits are due to

Intracellular compartments are not found in the cells of

Which of the following is a prokaryote?

Biology
3552 Views