Protozoans parasite whose multiplication is controlled by host metabolites

Viral particles capable of self perpetuation in host cytoplasm

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NEET • BIOLOGY • CELL-THE UNIT OF LIFE

Cell-the unit of life practice · Medium

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Showing 1-30 of 97 questions

1 Medium

1 of 97

Understanding +4 | -1

The transport of metabolities across the biomembrane occurs through

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Correct option: D

All of the above

Option D is correct because metabolites are transported across biomembranes through both passive and active transport, and bacteria have mesosomes.

2 Medium

2 of 97

Remembering +4 | -1

Glycocalyx is associated with

View answer and explanation

Correct option: B

Plasma membrane

Option B (Plasma membrane) is correct because the glycocalyx is a layer of carbohydrates coating the outside of the plasma membrane in some cells.

3 Medium

3 of 97

Remembering +4 | -1

Two animal cells are interconnected by

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Correct option: C

Desmosome

Option C (Desmosome) is correct because desmosomes are cell junctions that provide strong adhesion between animal cells, allowing them to withstand mechanical stress.

4 Medium

4 of 97

Remembering +4 | -1

Cell theory was formulated by

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Correct option: A

Schleiden and Schwann

Option A (Schleiden and Schwann) is correct because they are credited with formulating the cell theory.

5 Medium

5 of 97

Remembering +4 | -1

Kappa particles are

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Correct option: D

Sub-microscopic granules formed by the folding of naked DNA

Option C (Endosymbiont representing Gram negative bacteria species) is correct because kappa particles in Paramecium are endosymbiotic bacteria.

6 Medium

6 of 97

Remembering +4 | -1

Which of the given cell organelles is the important site of glycosylation of proteins?

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Correct option: B

Golgi apparatus

Option B (Golgi apparatus) is correct because the Golgi apparatus is the primary site for glycosylation of proteins in eukaryotic cells.

7 Medium

7 of 97

Remembering +4 | -1

The shorter and longer arms of a submetacentric chromosome are referred to as

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Correct option: B

p – arm and q – arm respectively

Option B (p – arm and q – arm respectively) is correct because, by convention, the shorter arm of a submetacentric chromosome is designated as the 'p' arm, and the longer arm is designated as the 'q' arm.

8 Medium

8 of 97

Understanding +4 | -1

Fluid nature of plasma membrane helps in all, except

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Correct option: D

Active transport through ion channels

Active transport through ion channels is the correct answer because active transport requires specific protein pumps and energy (ATP), and is not directly facilitated by the fluidity of the plasma membrane itself.

9 Medium

9 of 97

Understanding +4 | -1

Arrange the following steps in a correct sequence as per Gram’s staining technique
I. Treatment with 0.5% iodine solution
II. Washing with water
III. Treatment with absolute alcohol/acetone
IV. Staining with weak alkaline solution of crystal violet
The correct sequence is

View answer and explanation

Correct option: B

\to

\to

\to

III

Option B (IV → I → II → III) is correct because the correct sequence for Gram's staining is crystal violet, iodine, water wash, and then alcohol/acetone.

10 Medium

10 of 97

Understanding +4 | -1

The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?

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Correct option: B

Super-coiling in nucleosomes

Super-coiling in nucleosomes is the correct answer because DNA is packaged into nucleosomes, which are then further coiled and supercoiled to fit within the nucleus.

11 Medium

11 of 97

Understanding +4 | -1

Complete the given NCERT statements (I-III) by choosing appropriate options for the blanks (A-D) I. Cells that have membrane bound nuclei are called …A… II. In both …B… and …C… cells, cytoplasm is the main arena of cellular activities III. Cell that lack a membrane bound nucleus are called …D…

View answer and explanation

Correct option: B

A-eukaryotic cells, B-animal cells, C-plant cells, D-prokaryotic cells

Option B (A-eukaryotic cells, B-animal cells, C-plant cells, D-prokaryotic cells) is correct as it accurately completes the statements based on cell structure and organization.

12 Medium

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Understanding +4 | -1

Comparing small and large cells, which statement is correct?

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Correct option: C

Small cells have a large surface area per volume ratio

Option C (Small cells have a large surface area per volume ratio) is correct because a higher surface area to volume ratio facilitates efficient exchange of nutrients and waste.

13 Medium

13 of 97

Understanding +4 | -1

Which of the following statement is incorrect about plasmids?

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Correct option: C

They help in the replication of nucleoid

Option C (They help in the replication of nucleoid) is correct because plasmids do not directly participate in the replication of the nucleoid.

14 Medium

14 of 97

Analyzing +4 | -1

Analyse the following pairs and identify the correct option given.
I. Chromoplasts – Contain pigments other than chlorophyll
II. Leucoplasts – Devoid of any pigments
III. Amyloplasts – Store proteins
IV. Aleuroplasts – Store oils and fats
V. Elaioplasts – Store carbohydrates

View answer and explanation

Correct option: D

I and II are correct

Option D (I and II are correct) is correct because Chromoplasts contain pigments other than chlorophyll and Leucoplasts are devoid of any pigments.

15 Medium

15 of 97

Remembering +4 | -1

Bacterial flagellum consists of all of the following components except

View answer and explanation

Correct option: A

Microtubule

Option A (Microtubule) is correct because bacterial flagella are composed of flagellin protein and do not contain microtubules, which are found in eukaryotic flagella.

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16 Medium

16 of 97

Remembering +4 | -1

Balbiani rings are sites of:

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Correct option: A

RNA and protein synthesis

Option A (RNA and protein synthesis) is correct because Balbiani rings are puffed regions on polytene chromosomes and are sites of intense RNA transcription and subsequent protein synthesis.

17 Medium

17 of 97

Remembering +4 | -1

The inward movement of ions into the cells is ……
and the outward movement is….

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Correct option: A

Influx, efflux

Option A (Influx, efflux) is correct because influx refers to the inward movement of ions, while efflux refers to the outward movement.

18 Medium

18 of 97

Remembering +4 | -1

The term chromosome was coined by?

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Correct option: D

Waldeyer

Option D (Waldeyer) is correct because Waldeyer coined the term \"chromosome.\"

19 Medium

19 of 97

Understanding +4 | -1

Which of the given statements are correct? I.

Escherichia\mathrm{ }coli

is a Gram (

- \mathrm{ve}

) bacteria II.

Bacillus\mathrm{ }subtilis

is a Gram (

+ \mathrm{ve}

) bacteria III. Working of the Gram’s stain in Gram (

- \mathrm{ve}

) bacteria is due to high lipid content of the cell wall, which gets dissolved in organic solvents like acetone Choose the correct option

View answer and explanation

Correct option: D

I, II and III

Option D (I, II and III) is correct because all three statements about E. coli, Bacillus subtilis, and Gram staining are correct.

20 Medium

20 of 97

Understanding +4 | -1

In fluid mosaic model of plasma membrane

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Correct option: C

Phospholipids form a bimolecular layer in middle part

Option C (Phospholipids form a bimolecular layer in middle part) is correct because the fluid mosaic model describes the plasma membrane as a phospholipid bilayer.

21 Medium

21 of 97

Remembering +4 | -1

Which of the following plastid is a store house for proteins?

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Correct option: B

Aleuroplast

Option B (Aleuroplast) is correct because aleuroplasts are specialized plastids that store proteins.

22 Medium

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Analyzing +4 | -1

Six tubes containing preparations from animal tissue were set up as shown in the table. Tube contents
(i) Glucose + homogenized cell
(ii) Glucose + mitochondria
(iii) Glucose + cytoplasm lacking organelles
(iv) Pyruvic acid + homogenized cells
(v) Pyruvic acid + mitochondria
(vi) Pyruvic acid + Cytoplasm lacking organelles
After incubation, in which three tubes would carbon dioxide be produced?

View answer and explanation

Correct option: B

(i), (iv) and (v)

Option B ((i), (iv) and (v)) is correct because carbon dioxide production occurs during cellular respiration, which requires glucose or pyruvic acid and functional cellular components.

23 Medium

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Remembering +4 | -1

Spindle fibres attach on to:

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Correct option: B

Kinetochore of the chromosome

Option B (Kinetochore of the chromosome) is correct because spindle fibers attach to the kinetochore, a protein structure on the centromere of the chromosome, during cell division.

24 Medium

24 of 97

Understanding +4 | -1

Which of the following statements are false? I. Most cells are tiny and their volume ranges from 1 to 1000

\mathrm{n}{\mathrm{m}^3}

. II. Some cells have the microvilli to increase the absorptive surface area. III. All cells arise from pre-existing cells. IV. In plants, translocation of solutes is performed by xylem vessels and tracheids. V. According to cell theory, all cells arise from abiotic material.

View answer and explanation

Correct option: B

I, IV and V are false

Option B (I, IV and V are false) is correct because the listed statements are factually incorrect regarding cell size, solute translocation, and cell theory.

25 Medium

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Remembering +4 | -1

When the Centrometre is situated in the middle of two equal arms of chromosomes, the chromosome is referred as:

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Correct option: C

Metacentric

Option C (Metacentric) is correct because it describes a chromosome with the centromere located in the middle, resulting in two equal arms.

26 Medium

26 of 97

Analyzing +4 | -1

How many structures are not associated with bacterial cells?

i. Capsid
ii. Polysomes

iii. Fimbriae
iv. Virion

v. Flagella
vi. Naked genetic material

vii. Endomembrane
viii. Mitochondria

View answer and explanation

Correct option: B

Four

Option B (Four) is correct because Capsid, Virion, Endomembrane and Mitochondria are not associated with bacterial cells.

27 Medium

27 of 97

Understanding +4 | -1

Mark the incorrect about ribosomes

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Correct option: D

Not found in double membrane bound cell organelles of any eukaryotes.

Not found in double membrane bound cell organelles of any eukaryotes is incorrect because ribosomes (70S) are found inside mitochondria and chloroplasts, which are double membrane-bound organelles in eukaryotes.

28 Medium

28 of 97

Understanding +4 | -1

In prokaryotic cell,
I. enveloped genetic material is present
II. ribosomes are absent
III. an organised nucleus is absent
The correct option is

View answer and explanation

Correct option: C

Only III

Option C (Only III) is correct because prokaryotic cells lack an organized nucleus.

29 Medium

29 of 97

Remembering +4 | -1

In\mathrm{ }vitro

synthesis of RNA and DNA was carried out first by

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Correct option: A

Ochoa and Nirenberg

Option B (Ochoa and Kornberg) is correct because they were the first to carry out in vitro synthesis of RNA and DNA, respectively.

30 Medium

30 of 97

Remembering +4 | -1

During DNA replication in prokaryotes, DNA is anchored to

View answer and explanation

Correct option: B

Mesosome

Option B (Mesosome) is correct because in prokaryotes, DNA is anchored to the mesosome during replication.

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Key Takeaways

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