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Chapter 1: The Living World
Biodiversity; Need for classification; three domains of life; taxonomy and systematics; concept of species and taxonomical hierarchy; binomial nomenclature.
17
Chapter 2: Biological Classification
Five kingdom classifications; Salient features and classification of Monera, Protista and Fungi; Lichens, Viruses and Viroids.
28
Chapter 3: Plant Kingdom
Classification into major groups; Features and examples of Algae, Bryophyta, Pteridophyta, Gymnospermae (Excluded: Angiosperms, Plant Life Cycle & Alternation of Generations).
24
Chapter 4: Animal Kingdom
Salient features and classification: Non-chordates up to phyla level and chordates up to class level; examples of each. (No live specimens to be displayed).
34
Chapter 5: Morphology of Flowering Plants
Morphology of root, stem, leaf, inflorescence, flower, fruit, seed; description of family Solanaceae.
46

Structure of Viruses: Capsid, Envelope, Nucleic Acid

Structure of Viruses — CBSE Class 11 Biology 30 MCQ Quiz

Unit 1: Diversity of Living Organisms — Chapter 2: Biological Classification

CBSE Class 11 — Subject: Biology

30:00

Questions: 30 | Duration: 30 minutes

1. The basic components of a virion are:

Cell wall and nucleus Nucleic acid and protein coat (capsid) Mitochondria and chloroplasts Ribosomes and endoplasmic reticulum

2. The capsid is made up of repeating protein subunits called:

Ribosomes Pili Capsomeres Peptidoglycans

3. The protein spikes or glycoproteins on an enveloped virus function primarily to:

Mediate attachment and entry to host cells Provide structural support like a cell wall Carry out photosynthesis Synthesize viral nucleic acid

4. Viral envelopes are usually derived from:

Bacterial cell walls Host cell membranes during budding Viral ribosomes Soil particles

5. Which of the following is NOT a typical function of the capsid?

Protect viral nucleic acid Determine capsid symmetry (icosahedral, helical) Aid in attachment when spikes present Perform independent metabolic reactions like respiration

6. An example of an enveloped virus is:

Influenza virus Tobacco mosaic virus (TMV) T4 bacteriophage Poliovirus (non-enveloped)

7. The term 'nucleocapsid' refers to:

Only the viral envelope The viral nucleic acid together with its capsid Host cell DNA incorporated into virus Viral ribosomes

8. Which shape is characteristic of many plant viruses like TMV?

Icosahedral spherical Complex tadpole-like Helical rod-shaped Filamentous with envelope

9. An icosahedral capsid has how many triangular faces?

20 6 12 30

10. Viral genomes may be of which types?

Only linear double-stranded DNA DNA or RNA, single- or double-stranded, linear or segmented Only circular DNA like plasmids Only protein

11. Which viruses package RNA-dependent RNA polymerase within the virion?

DNA viruses only Retroviruses only Some RNA viruses (e.g., reoviruses, negative-sense RNA viruses) Viroids

12. The triangular faces in an icosahedral capsid are formed by arrangement of:

Capsomeres (protein subunits) Lipid molecules RNA strands themselves only DNA helices

13. Which virus is often used as an example of complex morphology (head-tail)?

Influenza Bacteriophage T4 Adenovirus (icosahedral) HIV (enveloped)

14. Which viral component is most directly responsible for protecting nucleic acid from degradation outside host cells?

Envelope lipids Host ribosomes Glycoprotein spikes only Capsid protein shell

15. A segmented viral genome means:

Genome is enclosed in multiple capsids separately Viral genome is split into two or more distinct RNA segments (e.g., influenza) Genome is proteinaceous Genome is circular only

16. The presence of an envelope generally makes a virus:

More resistant to detergents and drying Immune to antibody recognition More sensitive to desiccation and detergents (less stable outside host) Able to photosynthesise

17. Viral capsid symmetry types include:

Icosahedral and helical Cubic and spherical only Filamentous only Irregular only

18. Some viruses carry host-derived membrane proteins in their envelope which can help:

Increase genome size Evade host immune detection or interact with host cells Produce ATP for the virus Allow photosynthesis

19. Which is true about positive-sense (+) RNA viruses?

Their RNA cannot be translated directly They always carry reverse transcriptase Their genomic RNA can act as mRNA and be directly translated by host ribosomes They have DNA genomes

20. Which structure helps a bacteriophage attach to bacterial cells?

Tail fibers Envelope spikes Chloroplasts Medulla

21. Single-stranded DNA viruses must first:

Integrate into host genome always Synthesize a complementary strand to form double-stranded DNA before transcription Use RNA polymerase to replicate directly Package ribosomes inside capsid

22. Viral capsids assembled from many identical capsomeres demonstrate:

High genetic diversity in capsid proteins Complex metabolic pathways for assembly Efficient use of limited genetic material through repeated subunits Presence of host DNA in capsid

23. Segmented genomes allow which process among influenza viruses?

Slower mutation rates Reassortment (antigenic shift) when co-infecting a cell Complete immunity to host defenses Production of DNA instead of RNA

24. Which statement about non-enveloped (naked) viruses is true?

They are generally more stable in the environment and resistant to detergents They always have segmented genomes They cannot infect animals They carry an envelope derived from host

25. In many RNA viruses, the nucleic acid is housed in:

A lipid bilayer only Host nucleus always A mitochondrion-like organelle A protective protein capsid (sometimes with envelope)

26. Which term best describes viruses with complex symmetry (e.g., bacteriophage T4)?

Helical Complex (head-tail morphology) Icosahedral only Filamentous only

27. Viral envelope fusion with host membrane is facilitated by:

Capsomere rearrangement only Host DNA binding proteins Specific viral fusion proteins (glycoproteins) on the envelope Ribosomal subunits

28. Which of the following statements about capsomeres is correct?

Capsomeres are protein subunits encoded by viral genes that self-assemble Capsomeres are lipid molecules derived from the host Capsomeres are only found in enveloped viruses Capsomeres always carry enzymatic activity

29. Which statement best reflects why viruses use repeated capsomere subunits?

To increase genome length To build large protective structures using minimal genetic information To avoid host immune detection entirely To perform photosynthesis

30. Overall, understanding capsid, envelope and nucleic acid is important because these features determine:

The virus color only The dietary requirements of the virus Stability, host range, entry mechanism and replication strategies The ability to grow in culture plates without hosts

Prepared fully as per NCERT syllabus — practice for CBSE Board & NEET-UG aspirants.

Titles

Structure of Viruses MCQs — CBSE Class 11 Online Quiz
Capsid, Envelope & Nucleic Acid — 30-Question Timed MCQs
CBSE Class 11 Biology: Structure of Viruses Quiz with Scoring
NEET-UG Prep: Structure of Viruses MCQs Online Practice
NCERT Quiz: Structure of Viruses (Capsid, Envelope, Nucleic Acid)

Introduction Paragraph
The Structure of Viruses MCQs practice quiz is carefully designed as per the NCERT Class 11 Biology syllabus, focusing on key viral components such as the capsid, capsomeres, nucleic acid and envelope. This 30-question timed test with automatic scoring and per-question feedback helps students understand viral morphology, genome types, capsid symmetry, and examples like bacteriophages and influenza viruses. Perfect for CBSE Class 11 board exam revision and NEET-UG preparation, the quiz simulates exam conditions to enhance speed, accuracy, and concept clarity. Each question comes with concise NCERT-style explanations after submission, making it ideal for classroom practice, homework or independent study. Regular practice builds confidence for both board and competitive exams.

Tags
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Keywords
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General Characteristics of Viruses

Plant and Animal Viral Diseases

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