Home
Class 12
BIOLOGY
Read the given statements that describe ...

Read the given statements that describe certain infectious particle.
(i) It was discovered T.O. Diener and was found to be smaller than viruses.
(ii) It causes potato spindle tuber disease.
(iii) It is a free RNA particle which lacks the protein coat.
(iv) It has low molecular weight RNA as genetic material.
Which of the following is referred to here?

A

Virion

B

Viroid

C

Prion

D

Bacteriophage

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

Identify the infections agent on the basis of give information- * Discovered T.O. Diener * Smaller than viruses * Low molecular weight RNA * Absence of protein coat

Infectious RNA particles without protein coat (a) Have high molecular weight (b) Were discovered by Alper (c) Known to cause disease in plants (d) More than one option is correct

The following were the observations made for an infectious agent. (i) smaller than a virus, (ii) its nucleic acid had ribose as sugar (iii) lacks a Protein coat. Select the disease /s it is most likely to cause.

The given statements describe a group of organisms. (i) Instead of a cell wall they have a protein rich pellicible making their body flexible. (ii) They have 2 flagella, a short and a long one. (iii) They show mixotrophic nutrition (iv) They are connecting link between plants and animals. which of the following groups is referred to here?

Read the following statements. (i) In mitotic cell division chromosome number is halved. (ii) Centromere is the point where two sister chromatids are held together. (iii) The period between two successive mitotic divisions is known as telophase. (iv) In G_(1) phase of cell cycle protein and RNA are synthesised. Which of the above given statements are correct?

Read the given statements that define functions of a particular hormone. (i) Regulates the development, maturation and functions of epiddymis, vas deferens, seminal vesicle, prostrate gland, urethra, etc. (ii) Stimulates muscular growth of facial and axillary hair, aggressiveness, low pitch of voice, etc. (iii) Stimulates spermatogenesis. (iv) Act on CNS and sexual behaviour (Libido). (v) Produce anabolic (synthetic) effect on protein and carbohydrate metablosim. (vi) The Leydig,s cells/intestitial cells (present in interbular space). Secrete this hormone under the influence of LH. Which of the following hormones is referred here?

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.

Read the following statements and select the option which identifies the incorrect ones. (i) Potato spindle tuber disease and Chrysanthermum stunt disease are caused by viroids. (ii) T_(4) bacteriophage exhibits lytic cycle. (iii) Retroviruses have two copies of ssRNA. (iv) Interferous which prevent viral multiplication are glycolipid particles.

Which of the following statement are incorrect ? (i)RNA act as a genetic material as well as a catalyst. (ii)RNA is more stable than DNA (iii)RNA has evolved from DNA

Read the following statements and select the option which CORRECTLY identifies the INCORRECT ones. (i) Potato spindle tuber disease is caused by viroids . (ii) Viruses cause diseases like common cold, herpes and AIDS. (iii) Mycoplasma is prokaryotic organisms that completely lack a cell wall. (iv) In Ascomycetes, the asexual spores are conidia produced endogenously on the special mycelium called conidiophores