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NEET • BIOLOGY • CELL-THE UNIT OF LIFE
Cell-the unit of life practice · Mixed difficulty
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Showing 181-210 of 219 questions
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181
Easy
181 of 219
Remembering
+4 | -1
In which one of the following would you expect to find glyoxysomes?
View answer and explanation
Correct option: B
Endosperm of castor
Option B (Endosperm of castor) is correct because glyoxysomes are abundant in plant tissues, particularly the endosperm of germinating seeds like castor, where they convert fats to sugars.
182
Hard
182 of 219
Remembering
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A plant cell without cell wall is called?
View answer and explanation
Correct option: B
Protoplast
Option B (Protoplast) is correct because a protoplast is a plant cell that has had its cell wall removed.
183
Hard
183 of 219
Remembering
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Dutrochet has given the concept about cell in
View answer and explanation
Correct option: D
1824
Option D (1824) is correct because Dutrochet proposed that the cell is the fundamental unit of structure in 1824.
184
Easy
184 of 219
Remembering
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Middle lamella is mainly composed of
View answer and explanation
Correct option: C
Calcium pectate
Option C (Calcium pectate) is correct because the middle lamella, the layer cementing adjacent plant cells, is primarily composed of calcium pectate.
185
Medium
185 of 219
Remembering
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Membrane less cell organelle common to both prokaryotes and eukaryotes is
View answer and explanation
Correct option: C
Ribosome
Option C (Ribosome) is correct because ribosomes are the only membrane-less organelles found in both prokaryotic and eukaryotic cells.
186
Easy
186 of 219
Remembering
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Protoplast is
View answer and explanation
Correct option: B
Cell without cell wall
Option B (Cell without cell wall) is correct because a protoplast is a plant or bacterial cell that has had its cell wall completely removed.
187
Medium
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Understanding
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I. It is the extension of plasma membrane into the cytoplasm
II. It helps in cell wall formation, DNA replication, respiration, secretion processes, increases the surface area of plasma membrane and enzymatic contents. It also helps in cytokinesis
III. It I the characteristic of bacterial cells
The above features are attributed to bacteria
II. It helps in cell wall formation, DNA replication, respiration, secretion processes, increases the surface area of plasma membrane and enzymatic contents. It also helps in cytokinesis
III. It I the characteristic of bacterial cells
The above features are attributed to bacteria
View answer and explanation
Correct option: C
Mesosome
Option C (Mesosome) is correct because the described features are characteristic of mesosomes in bacterial cells.
188
Easy
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Understanding
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A biomembrane consists of lipids, proteins carbohydrates and water. These lipid molecules are
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because lipid molecules in biomembranes are amphipathic, having both polar and non-polar ends.
189
Easy
189 of 219
Understanding
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Choose the correct statement w.r.t. E. coli
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Correct option: C
DNA in nucleoid is organised in large loops
Option C (DNA in nucleoid is organised in large loops) is correct because in E. coli, the DNA is organized into loops within the nucleoid region.
190
Easy
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Remembering
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Fluid mosaic model was given by
View answer and explanation
Correct option: C
Singer and Nicolson
Option C (Singer and Nicolson) is correct because the fluid mosaic model of the cell membrane was proposed by Singer and Nicolson in 1972.
191
Medium
191 of 219
Remembering
+4 | -1
Which of the following is not a characteristic of prokaryotic cells?
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Correct option: D
Membrane bound organelles
Option D (Membrane bound organelles) is correct because prokaryotic cells lack membrane-bound organelles like mitochondria, endoplasmic reticulum, and Golgi apparatus.
192
Medium
192 of 219
Remembering
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In prokaryotes, genetic material is
View answer and explanation
Correct option: A
Basically naked
Option A (Basically naked) is correct because prokaryotic genetic material is a circular DNA molecule not enclosed in a membrane and not associated with histones (in most cases).
193
Medium
193 of 219
Understanding
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In submetacentric chromosome
View answer and explanation
Correct option: D
One arm is long than the other
Option D (One arm is long than the other) is correct because submetacentric chromosomes have the centromere slightly away from the middle, resulting in unequal arm lengths.
194
Easy
194 of 219
Remembering
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The study related to the structure and function of a cell is called
View answer and explanation
Correct option: B
Cytology
Option B (Cytology) is correct because cytology is the branch of biology concerned with the structure and function of cells.
195
Easy
195 of 219
Remembering
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The type of ribosomes found in prokaryotes is
View answer and explanation
Correct option: A
70S type
Option A is correct because prokaryotes contain 70S ribosomes, which are composed of 30S and 50S subunits.
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196
Medium
196 of 219
Analyzing
+4 | -1
Read the following statements and identify the correct option given.
I. In prokaryotic cell, the nuclear membrane, chloroplast, mitochondria,
microtubules and different kinds of pili are absent.
II. In eukaryotic cell, the nuclear membrane, chloroplast, mitochondria and pili are present.
III. In prokaryotic cell, the ribosome is of 70 S type and in mitochondria of
eukaryotic animal cell, the ribosome is 80 S type
I. In prokaryotic cell, the nuclear membrane, chloroplast, mitochondria,
microtubules and different kinds of pili are absent.
II. In eukaryotic cell, the nuclear membrane, chloroplast, mitochondria and pili are present.
III. In prokaryotic cell, the ribosome is of 70 S type and in mitochondria of
eukaryotic animal cell, the ribosome is 80 S type
View answer and explanation
Correct option: D
I, II and III are wrong
Option D (I, II and III are wrong) is correct because all three statements contain inaccuracies about prokaryotic and eukaryotic cells.
197
Hard
197 of 219
Remembering
+4 | -1
Organelle important in spindle formation during nuclear division is
View answer and explanation
Correct option: C
Centriole
Option C (Centriole) is correct because centrioles are involved in the formation of the spindle fibers during cell division in animal cells.
198
Easy
198 of 219
Remembering
+4 | -1
Protoplasm of a eukaryotic cell is called
View answer and explanation
Correct option: B
Protoplast
Option C (Cytoplasm) is correct because the protoplasm of a eukaryotic cell excluding the nucleus is called cytoplasm. Protoplast includes the nucleus.
199
Medium
199 of 219
Remembering
+4 | -1
Which of the following is characteristic of phospholipids of plasma membrane?
View answer and explanation
Correct option: B
One polar head and two non-polar tails
Option B (One polar head and two non-polar tails) is correct because phospholipids have a hydrophilic (polar) head and two hydrophobic (non-polar) fatty acid tails.
200
Medium
200 of 219
Remembering
+4 | -1
The difference between rough endoplasmic reticulum and smooth endoplasmic reticulum is that rough endoplasmic recticulum
View answer and explanation
Correct option: B
Contains ribosomes
Option B (Contains ribosomes) is correct because rough endoplasmic reticulum (RER) is characterized by the presence of ribosomes on its surface, which are involved in protein synthesis.
201
Easy
201 of 219
Remembering
+4 | -1
The two polynucleotide chains in DNA are
View answer and explanation
Correct option: C
Antiparallel
Option C (Antiparallel) is correct because the two strands of DNA run in opposite directions (5' to 3' and 3' to 5').
202
Hard
202 of 219
Remembering
+4 | -1
Which of the following is the first cell of human life ?
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Correct option: D
Synkaryon
Option D (Synkaryon) is correct because it is the diploid cell formed by the fusion of the sperm and egg nuclei during fertilization.
203
Hard
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Remembering
+4 | -1
Arrangement of microtubules in a flagellum and a centriole is respectively?
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Correct option: D
9 + 2 and 9 + 0
Option D (9 + 2 and 9 + 0) is correct because a flagellum has a 9+2 arrangement of microtubules, while a centriole has a 9+0 arrangement.
204
Easy
204 of 219
Remembering
+4 | -1
Glycocalyx (mucilage sheath) of a bacterial cell may occur in the form of a loose sheath called …A… or it may be thick and tough called …B… Choose the correct pair from the given option
View answer and explanation
Correct option: B
A-slime layer, B-capsule
Option B (A-slime layer, B-capsule) is correct because the glycocalyx can be a loose slime layer or a thick, tough capsule.
205
Medium
205 of 219
Understanding
+4 | -1
Which of the following statement is incorrect regarding the band region of polytene chromosome?
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Correct option: A
Feulgen negative area
Option A (Feulgen negative area) is correct because the band region of polytene chromosomes is Feulgen positive due to the presence of DNA.
206
Easy
206 of 219
Remembering
+4 | -1
Chromosome number is
View answer and explanation
Correct option: A
Fixed for a species
Option A (Fixed for a species) is correct because the number of chromosomes is a characteristic feature of a species.
207
Easy
207 of 219
Remembering
+4 | -1
Study of form, structure and composition of cells is called
View answer and explanation
Correct option: B
Cytology
Option B (Cytology) is correct because cytology is the study of the structure and function of cells.
208
Medium
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Analyzing
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Assertion (A): Mitochondria and chloroplast are semiautonomous organelles.
Reason (R): These are formed by the division of pre-existing organelles as well as they contain DNA, but lack protein synthesizing machinery.
Reason (R): These are formed by the division of pre-existing organelles as well as they contain DNA, but lack protein synthesizing machinery.
View answer and explanation
Correct option: C
If A is true, but R is false
Option B (C, H, O, N) is correct because carbon, hydrogen, oxygen, and nitrogen are the most abundant elements in living systems, making up about 95% of their mass.
209
Medium
209 of 219
Understanding
+4 | -1
The ratio of centromeres, kinetochores, DNA molecules in a metaphase chromosome?
View answer and explanation
Correct option: A
0.043078704
Option A (0.043078704) is correct because the ratio is calculated as 1 centromere : 2 kinetochores : (number of base pairs/number of base pairs per DNA molecule) which results in the given ratio.
210
Easy
210 of 219
Understanding
+4 | -1
Plasma membrane helps in
View answer and explanation
Correct option: C
Osmoregulation
Option C (Osmoregulation) is correct because the plasma membrane regulates the movement of water and solutes, maintaining osmotic balance.
Revision notes and key takeaways
Review CELL-THE UNIT OF LIFE in your textbook or class notes, then use this set to check your understanding.
Showing 181-210 of 219 questions