Botany
Which of the following is not correct for viruses?
A.
They cannot utilize O₂
B.
They can grow In dilute surgery solutions
C.
They can multiply in host cytoplasm
D.
They are made up of nucleic acid and proteins
Potato spindle tuber disease is caused by:
A.
Nematode
B.
Viruses
C.
Bacterium
D.
Viroid
RNA particles causing symptoms like that of viral disease are known as:
A.
Viroid
B.
Vira
C.
Mycoplasma
D.
Virus
Which among the following contains only one type of nucleic acid?
A.
Bacteria
B.
Yeast
C.
Mycoplasma
D.
Virus
The genetic material in viruses is:
A.
Only RNA
B.
Only DNA
C.
DNA or RNA
D.
Proteins and RNA
Tobacco mosaic virus (TMV) genes are:
A.
Single-stranded DNA
B.
Polyribonucleotide's
C.
proteinaceous
D.
Double-stranded RNA
Viruses free plants can be produced by:
A.
Anther culture
B.
Ovule culture
C.
Stem tip culture
D.
Leaf explants culture
Acquired Immune Deficiency Syndrome (AIDS) is:
A.
The result of inability of the body to produce interferons
B.
Characterized by a reduction in the number of T-lymphocytes
C.
An autoimmune disease
D.
Characterized by a reduction in the number of killer T-cells
Prions are:
A.
Infectious nucleic acid
B.
Infectious viruses
C.
Infectious proteins
D.
Infectious nucleoproteins
Coliphage Ø × 174 has:
A.
Single-stranded DNA
B.
Double-stranded DNA
C.
Single-stranded RNA
D.
Double-stranded RNA
A temperate bacteriophage:
A.
Causing complete bursting of the infected bacterial cell after the latent period
B.
Does not cause complete bursting of the infected bacterial cell after the latent period
C.
Does not cause the death of the infectious bacterial cell but the infected cell causes to divide
D.
Does not cause the death of the infected bacterial cell but continues to exist there and this cell divides almost like a normal cell
Who is credited to show that 'viruses are the cause of cancer'?
A.
Mendel
B.
Khorana
C.
Swami nathan
D.
Dulbecco
Which of the followings is a viral disease?
A.
Red rot of sugarcane
B.
Leaf roll of potato
C.
wilt of cabbage
D.
Damping off disease
A scientist wants to study the viral effects on plants. Which of the following parts of the plant should be excluded?
A.
Phloem
B.
Pith
C.
Shoot apex
D.
Cortex
Cyanophages were discovered by:
A.
Jacob and Monod
B.
Schafferman and Morris
C.
Lederberg and Zinder
D.
Lederberg and Tatum
One Important character of viruses is that they:
A.
Can multiply outside a living cell
B.
Can be cultured in a cell free medium
C.
Have an independent metabolism
D.
Do not have an independent metabolism
Phages that show lysogenic cycle are called:
A.
Temperature Phages
B.
Virulent Phages
C.
Oncogenic Phages
D.
Lytic Phages
Viruses are made up of:
A.
Proteins and nucleic acids
B.
Proteins and carbohydrates
C.
Lipids and nucleic acids
D.
Starch, proteins and lipids
The smallest known agent of a plant disease is:
A.
Virus
B.
Viroid
C.
Bacteria
D.
Mycoplasma
For defence against virus attacks, body produces:
A.
Antibodies
B.
Histamines
C.
Antigens
D.
Interferon
The spread of AIDS is promoted by:
A.
Homosexuality
B.
Immoral way of life
C.
Use of infected needles in blood transfusion
D.
All of these
Which disease are viral diseases?
A.
Cholera and rabies
B.
Typhoid and polio
C.
Rabies and polio
D.
Syphilis and common cold
A viral disease of plant is:
A.
Citrus canker
B.
Brown rot of potato
C.
Pea mosaic
D.
Angular leaf spot
A naked RNA practice causing the symptoms like that of a viral disease is known as:
A.
Virion
B.
Viroid
C.
Viral
D.
none of these
During viral infection, the protein formed in host cells to resist is:
A.
Interferon
B.
Antitoxin
C.
Antibody
D.
Histone