Home
Class 12
BIOLOGY
Viroids are small infectious particles w...

Viroids are small infectious particles which are devoid of :
`I.` Capsomeres `II`. Enzymes
`III`. Ribonucleic acid `IV` DNA

A

`I,II` and `III`

B

`I,III` and `IV`

C

`I,II` and IV`

D

`II, III` and `IV`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding viroids and what they are devoid of, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Viroids**: Begin by defining what viroids are. Viroids are small infectious particles that are significantly smaller than viruses and are known to cause diseases in plants. 2. **Composition of Viroids**: Identify the components of viroids. Viroids consist solely of a short strand of circular RNA (ribonucleic acid) and do not have a protein coat (capsid). 3. **Analyzing the Options**: - **I. Capsomeres**: Viroids do not have capsomeres because they lack a protein coat. - **II. Enzymes**: Viroids do not contain enzymes, as they are not complex enough to have metabolic functions. - **III. Ribonucleic acid**: This is incorrect because viroids are composed of RNA. - **IV. DNA**: Viroids do not contain DNA; they are solely made of RNA. 4. **Conclusion**: Based on the analysis, viroids are devoid of: - Capsomeres (I) - Enzymes (II) - DNA (IV) Thus, the correct answer is that viroids are devoid of options I, II, and IV. ### Final Answer: The correct option is **1, 2, and 4**. ---
Promotional Banner

Topper's Solved these Questions

  • BIODIVERSITY AND CONSERVATION

    VMC MODULES ENGLISH|Exercise IN-CHAPTER EXERCISE-B|10 Videos

  • BIOTECHNOLOGY : PRINCIPLES AND PROCESSES

    VMC MODULES ENGLISH|Exercise IMPECCABLE|55 Videos

Similar Questions

Explore conceptually related problems

Which of the following statements regarding viruses are correct? (i) These are cellular, infectious, nucleoprotein particles. (ii) They can be grown in culture medium. (iii) Genetic material is either DNA or RNA, but never both. (iv) They can be crystallised.

Which enzymes are not used for isolation of the DNA? I. Cellulose II. Lysozyme III. Dnase IV. Lyase

The biological scissors are : i. Restriction enzymes are used to cut DNA into nucleotide monomers. ii. Enzymes always cut the DNA at specific nucleotide sequences. iii. Present variously recognizing and cutting different DNA sequences. Select the option with the correct statement/s.

The smallest disease - causing agent is .... and it is made up of ………. (a) (i) mycoplasma (ii) proteins and nucleic acids (b) (i) prions, (ii) Proteins only (c) (i) viroids, (ii) nucleic acids only (d) (i) viroids, (ii) proteins only

Arrange increasing order of acidic strength of following dibasic acids: (I) oxalic acid. " " (II) succinic acid " " (III) malonic acid " " (IV) adipic acid

Which of the following secondary metabolites belong to the group drugs I. Morphine " " II. Curcumin III. Codeine " " IV. Vinblastine V. Abrin (a) I and II (b) I and V (c) II and IV (d) I and III

From the following, the statement /s that will help to determine the specificity of an enzyme is /are: I. The bonding between R groups of amino acids of the polypeptide II. The optimum pH of the enzyme III. The peptide bonds between amino acids of the polypeptide IV. The shape of the substrate molecule

Pars distalis region of pituitary does not produce these enzymes I. Melanocyte stimulating hormone II. Vasopressin III. Prolactin IV. Growth hormone

I. Transform bacteria with recombinant DNA molecule. II. Cut the plasmid DNA using restriction enzymes. III. Extract plasmid DNA from bacteria cells. IV. Hydrogen-bond the plasmid DNA to non-plasmid DNA fragments. V. Use ligate to seal plasmid DNA to non-plasmid DNA. From the given list, which of the following is the most logical sequence of steps for splicing foregain DNA into a plasmid and inserting the plasmid into a bacterium ?

Mineral acids are stronger acids than carboxylic acids because (i) mineral acids are completely ionised. (ii) carboxylic acids are completely ionised. (iii) mineral acids are partially ionised. (iv) carboxylic acids are partially ionised.