(d) The capsomere is a subunit of the capsid, an outer covering of protein that protects the genetic material of a virus. Capsomeres self-assemble to form the capsid.
NCERT/Page-25 / N-20
Biological Classification
267290
The genetic material of virus includes
1 only RNA.
2 only DNA.
3 RNA and DNA both
4 RNA or DNA, i.e., one nucleic acid in a virus.
Explanation:
(d) Viruses are obligate intracellular parasite which can reproduce only by invading and taking over other cells as they lack the cellular machinary for self reproduction. Viruses have either DNA or RNA as the genetic material. Viruses having RNA as the genetic material are known as Retroviruses.
NCERT Page-25 / N-20
Biological Classification
267291
Which of the following statements is not correctfor viruses?
1 Viruses are obligate parasites.
2 Viruses can multiply onlywhen they are inside the living cells.
3 Viruses cannot pass through bacterial filters.
4 Virusesare made up of protein and DNA or RNA (never both DNA and RNA).
Explanation:
(c) Virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. Viruses can pass through bacterial proof filters as they are smaller than bacteria.
NCERT Page-25 / N-20
Biological Classification
267292
Which of the following statements is incorrect?
1 TMV has a double-stranded RNA molecule.
2 Most plant viruses are RNA viruses.
3 The bacteriophage has double-stranded DNA.
4 Most animal viruses are DNA viruses.
Explanation:
(a) Tobacco mosaic virus (TMV) is a single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanacea.
NCERT Page-25 / N-20
Biological Classification
267293
A virus can be considered a living organism because it
1 responds to touch stimulus
2 respires
3 reproduces (inside the host)
4 can cause disease
Explanation:
(c) A virus is an infective agent that typically consists of a nucleic acid molecule in a protein coat. It is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host. It can be considered living organisms because it reproduces inside the host cell.
(d) The capsomere is a subunit of the capsid, an outer covering of protein that protects the genetic material of a virus. Capsomeres self-assemble to form the capsid.
NCERT/Page-25 / N-20
Biological Classification
267290
The genetic material of virus includes
1 only RNA.
2 only DNA.
3 RNA and DNA both
4 RNA or DNA, i.e., one nucleic acid in a virus.
Explanation:
(d) Viruses are obligate intracellular parasite which can reproduce only by invading and taking over other cells as they lack the cellular machinary for self reproduction. Viruses have either DNA or RNA as the genetic material. Viruses having RNA as the genetic material are known as Retroviruses.
NCERT Page-25 / N-20
Biological Classification
267291
Which of the following statements is not correctfor viruses?
1 Viruses are obligate parasites.
2 Viruses can multiply onlywhen they are inside the living cells.
3 Viruses cannot pass through bacterial filters.
4 Virusesare made up of protein and DNA or RNA (never both DNA and RNA).
Explanation:
(c) Virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. Viruses can pass through bacterial proof filters as they are smaller than bacteria.
NCERT Page-25 / N-20
Biological Classification
267292
Which of the following statements is incorrect?
1 TMV has a double-stranded RNA molecule.
2 Most plant viruses are RNA viruses.
3 The bacteriophage has double-stranded DNA.
4 Most animal viruses are DNA viruses.
Explanation:
(a) Tobacco mosaic virus (TMV) is a single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanacea.
NCERT Page-25 / N-20
Biological Classification
267293
A virus can be considered a living organism because it
1 responds to touch stimulus
2 respires
3 reproduces (inside the host)
4 can cause disease
Explanation:
(c) A virus is an infective agent that typically consists of a nucleic acid molecule in a protein coat. It is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host. It can be considered living organisms because it reproduces inside the host cell.
(d) The capsomere is a subunit of the capsid, an outer covering of protein that protects the genetic material of a virus. Capsomeres self-assemble to form the capsid.
NCERT/Page-25 / N-20
Biological Classification
267290
The genetic material of virus includes
1 only RNA.
2 only DNA.
3 RNA and DNA both
4 RNA or DNA, i.e., one nucleic acid in a virus.
Explanation:
(d) Viruses are obligate intracellular parasite which can reproduce only by invading and taking over other cells as they lack the cellular machinary for self reproduction. Viruses have either DNA or RNA as the genetic material. Viruses having RNA as the genetic material are known as Retroviruses.
NCERT Page-25 / N-20
Biological Classification
267291
Which of the following statements is not correctfor viruses?
1 Viruses are obligate parasites.
2 Viruses can multiply onlywhen they are inside the living cells.
3 Viruses cannot pass through bacterial filters.
4 Virusesare made up of protein and DNA or RNA (never both DNA and RNA).
Explanation:
(c) Virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. Viruses can pass through bacterial proof filters as they are smaller than bacteria.
NCERT Page-25 / N-20
Biological Classification
267292
Which of the following statements is incorrect?
1 TMV has a double-stranded RNA molecule.
2 Most plant viruses are RNA viruses.
3 The bacteriophage has double-stranded DNA.
4 Most animal viruses are DNA viruses.
Explanation:
(a) Tobacco mosaic virus (TMV) is a single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanacea.
NCERT Page-25 / N-20
Biological Classification
267293
A virus can be considered a living organism because it
1 responds to touch stimulus
2 respires
3 reproduces (inside the host)
4 can cause disease
Explanation:
(c) A virus is an infective agent that typically consists of a nucleic acid molecule in a protein coat. It is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host. It can be considered living organisms because it reproduces inside the host cell.
(d) The capsomere is a subunit of the capsid, an outer covering of protein that protects the genetic material of a virus. Capsomeres self-assemble to form the capsid.
NCERT/Page-25 / N-20
Biological Classification
267290
The genetic material of virus includes
1 only RNA.
2 only DNA.
3 RNA and DNA both
4 RNA or DNA, i.e., one nucleic acid in a virus.
Explanation:
(d) Viruses are obligate intracellular parasite which can reproduce only by invading and taking over other cells as they lack the cellular machinary for self reproduction. Viruses have either DNA or RNA as the genetic material. Viruses having RNA as the genetic material are known as Retroviruses.
NCERT Page-25 / N-20
Biological Classification
267291
Which of the following statements is not correctfor viruses?
1 Viruses are obligate parasites.
2 Viruses can multiply onlywhen they are inside the living cells.
3 Viruses cannot pass through bacterial filters.
4 Virusesare made up of protein and DNA or RNA (never both DNA and RNA).
Explanation:
(c) Virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. Viruses can pass through bacterial proof filters as they are smaller than bacteria.
NCERT Page-25 / N-20
Biological Classification
267292
Which of the following statements is incorrect?
1 TMV has a double-stranded RNA molecule.
2 Most plant viruses are RNA viruses.
3 The bacteriophage has double-stranded DNA.
4 Most animal viruses are DNA viruses.
Explanation:
(a) Tobacco mosaic virus (TMV) is a single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanacea.
NCERT Page-25 / N-20
Biological Classification
267293
A virus can be considered a living organism because it
1 responds to touch stimulus
2 respires
3 reproduces (inside the host)
4 can cause disease
Explanation:
(c) A virus is an infective agent that typically consists of a nucleic acid molecule in a protein coat. It is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host. It can be considered living organisms because it reproduces inside the host cell.
(d) The capsomere is a subunit of the capsid, an outer covering of protein that protects the genetic material of a virus. Capsomeres self-assemble to form the capsid.
NCERT/Page-25 / N-20
Biological Classification
267290
The genetic material of virus includes
1 only RNA.
2 only DNA.
3 RNA and DNA both
4 RNA or DNA, i.e., one nucleic acid in a virus.
Explanation:
(d) Viruses are obligate intracellular parasite which can reproduce only by invading and taking over other cells as they lack the cellular machinary for self reproduction. Viruses have either DNA or RNA as the genetic material. Viruses having RNA as the genetic material are known as Retroviruses.
NCERT Page-25 / N-20
Biological Classification
267291
Which of the following statements is not correctfor viruses?
1 Viruses are obligate parasites.
2 Viruses can multiply onlywhen they are inside the living cells.
3 Viruses cannot pass through bacterial filters.
4 Virusesare made up of protein and DNA or RNA (never both DNA and RNA).
Explanation:
(c) Virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea. Viruses can pass through bacterial proof filters as they are smaller than bacteria.
NCERT Page-25 / N-20
Biological Classification
267292
Which of the following statements is incorrect?
1 TMV has a double-stranded RNA molecule.
2 Most plant viruses are RNA viruses.
3 The bacteriophage has double-stranded DNA.
4 Most animal viruses are DNA viruses.
Explanation:
(a) Tobacco mosaic virus (TMV) is a single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanacea.
NCERT Page-25 / N-20
Biological Classification
267293
A virus can be considered a living organism because it
1 responds to touch stimulus
2 respires
3 reproduces (inside the host)
4 can cause disease
Explanation:
(c) A virus is an infective agent that typically consists of a nucleic acid molecule in a protein coat. It is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host. It can be considered living organisms because it reproduces inside the host cell.
