AP Biology Questions with CORRECT Answers
Question:
1Compare the structures of tobacco mosaic virus and influenza virus
Answer:
TMV consists of one molecule of RNA surrounded by a helical array of proteins. The
influenza virus has eight molecules of RNA, each surrounded by a helical array of
proteins, similar to the arrangement of the single RNA molecule in TMV.; the influenza
virus has an outer envelope
Question:
2-In 2005, scientists discovered a virus that could, under certain conditions, develop
pointed projections at each end while outside a host cell. How does this observation fit
with the characteristics of viruses as nonliving?
Answer:
One of the arguments for regarding viruses as nonliving is that they cannot perform any
activity characteristic of living organisms unless they are inside a host cell. This virus
challenges that generalization because the virus can change its shape without having
access to host cell proteins
Question:
1-Compare the effect on the host cell of a lytic phage and a lysogenic temperate phage.
Answer:
Lytic phage kills the host cell, the lysogenic can either lyse the cell or integrate into the
host chromosome
Question:
2-How do some viruses reproduce with out possessing or ever synthesizing DNA?
Answer:
The genetic material of these viruses is RNA which is replicated inside the infected cell
by enzymes encoded by the virus; the viral genome serves as mRNA for the synthesis of
viral proteins
Question:
3Why is HIV considered a retrovirus?
Answer:
Because it synthesizes DNA from its RNA genome; this is retro or reverse of the normal
way which is DNA to RNA information flow
Question:
1Compare the structures of tobacco mosaic virus and influenza virus
Answer:
TMV consists of one molecule of RNA surrounded by a helical array of proteins. The
influenza virus has eight molecules of RNA, each surrounded by a helical array of
proteins, similar to the arrangement of the single RNA molecule in TMV.; the influenza
virus has an outer envelope
Question:
2-In 2005, scientists discovered a virus that could, under certain conditions, develop
pointed projections at each end while outside a host cell. How does this observation fit
with the characteristics of viruses as nonliving?
Answer:
One of the arguments for regarding viruses as nonliving is that they cannot perform any
activity characteristic of living organisms unless they are inside a host cell. This virus
challenges that generalization because the virus can change its shape without having
access to host cell proteins
Question:
1-Compare the effect on the host cell of a lytic phage and a lysogenic temperate phage.
Answer:
Lytic phage kills the host cell, the lysogenic can either lyse the cell or integrate into the
host chromosome
Question:
2-How do some viruses reproduce with out possessing or ever synthesizing DNA?
Answer:
The genetic material of these viruses is RNA which is replicated inside the infected cell
by enzymes encoded by the virus; the viral genome serves as mRNA for the synthesis of
viral proteins
Question:
3Why is HIV considered a retrovirus?
Answer:
Because it synthesizes DNA from its RNA genome; this is retro or reverse of the normal
way which is DNA to RNA information flow
