Viroids have
ssRNA not enclosed by a protein coat
ssDNA not enclosed by a protein coat
dsDNA enclosed by a protein coat
dsRNA enclosed by protein coat
A.
ssRNA not enclosed by a protein coat
Viroids are small, single-stranded, circular RNA molecules not enclosed by a protein coat. They were discovered by TO Diener in 1971. Viroid replication requires host-encoded RNA polymerase.
Probes, used in DNA fingerprinting, are initially
Single-stranded RNA
Mini-satellite
19base long oligonucleotide
All of the above
Which part of the animal virus is not produced in multiple copies?
Capsid
Proteins
Envelops
Ribosome
Match the following columns and choose the correct option.
| Column I | Column II |
| A. Mutation Breeding | 1. The laborious and expensive process to obtain gene variation. |
| B. Selection | 2. Hybrid vigour can be maintained for several generations |
| C. Hybridisation | 3. Simplest and easiest method of plant improvement. |
| D. Introduction | Oldest breeding method |
| A quick method to obtain gene variation |
A-5, B-4, C-1, D-2
A-5, B-4, C-1, D-3
A-4, B-2, C-3, D-1
A-1, B-2, C-4, D-5
Which of the following is not true for a species?
Members of a species can interbreed
Variations occur among members of species
Each species is reproductively isolated from every other species
Gene flow does not occur between the populations of a species
Satellite DNA is a useful tool in
Organ transplantation
Sex determination
Forensic science
Genetic engineering
Stability of ecosystem depends upon
Primary productivity
Interchange between producers and consumers
Number of producers
Number of consumers
Biotic potential or potential natality means
Natural increase of population under ideal/optimum conditions
The potential of the organism in a biome
Number of organisms in a biome
Species of maximum number in a population
The world’s highly prized wool yielding ‘Pashmina’ breed is
Sheep
Goat
Goat-sheep cross
Kashmiri sheep-Afghan sheep cross
