Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 20, Problem 4SQ
Summary Introduction
Introduction:
Human immunodeficiency virus (HIV) is a virus under retroviral subgroup classification that causes acquired immunodeficiency syndrome (AIDS) infection in humans. It is an RNA virus that possesses RNA as its genetic material. HIV consists of ssRNA that transcribes into dsDNA (using reverse transcriptase enzyme) when it is integrated into the host cell, using its replication machinery. After being transformed to DNA, the viruses produce proteins that are required for the synthesis of new viral particles.
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Chapter 20 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 20 - Prob. 1SQCh. 20 - Prob. 2SQCh. 20 - Prob. 3SQCh. 20 - Prob. 4SQCh. 20 - __________ do not reproduce sexually. a....Ch. 20 - Prob. 6SQCh. 20 - Adapting to Host Defenses Surface proteins called...Ch. 20 - Prob. 2DAACh. 20 - Prob. 3DAACh. 20 - Adapting to Host Defenses Surface proteins called...
Ch. 20 - Prob. 7SQCh. 20 - Bacteria that serve as decomposers are ___ . a....Ch. 20 - Prob. 9SQCh. 20 - Formation of a(n) ___ allows some soil bacteria to...Ch. 20 - Prob. 11SQCh. 20 - Prob. 12SQCh. 20 - Which of these diseases is caused by bacteria? a....Ch. 20 - Prob. 14SQCh. 20 - Prob. 15SQCh. 20 - If a cut or scrape becomes infected,...Ch. 20 - The adenoviruses that cause colds do not have a...Ch. 20 - Prob. 3CTCh. 20 - Prob. 4CT
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- Influenza vaccines must be changed yearly because the amino acid sequence of the viral proteins change gradually over time. Based on this information, which is the most logical conclusion? The influenza virusa) is enveloped. b) is non-enveloped.c) has a DNA genome. d) has an RNA genome.e) causes a persistent infection.arrow_forwardWhy was it difficult to break the chain of infection during the Zika outbreak? A. Scientists couldn't figure out how the virus even started. B. Because scientists hadn't yet realized it was impossible to break the chain of infection. C. It required killing all the birds in the region. D. It required killing all of the mosquitos in the region.arrow_forwardAfter Iraq was found not to have weapons of mass destruction after all, the concern about which of the following died down? A. Anthrax B. Ebola C. Smallpox D. Hantavirusarrow_forward
- Which of the following does NOT inititiate DNA synthesis? a. a single-stranded DNA virus. b. a (-) single stranded RNA virus c. a (+) single stranded RNA virus d. a double-stranded DNA virus (Poxviridae) e. Both (-) and (+) single-stranded RNA virusesarrow_forwardWhich of these is true of prions?a. They are small RNA viruses.b. They replicate in the nucleus.c. They lack protein.d. They cause death of brain cells.arrow_forwardThe drugs used against HIV in AIDS therapy are not effective against the flu because a. HIV is an RNA virus and influenza is a DNA virus. b. HIV is a DNA virus and influenza is an RNA virus. c. the two viruses have different-sized genomes. d. the proteins targeted by HIV drugs are not found in influenza.arrow_forward
- HIV has a high mutation rate due to the imprecise opera-tion of its:(a) Viral membrane(b) CD4 receptor(c) Reverse transcriptase(d) Protease(e) Dismutasearrow_forwardWhich is NOT true of the Tuskegee Syphilis Study? a. Participants never saw doctors or nurses b. Participants were given the newly discovered penicillin c. The study was an important reason the U.S. developed ethical standards for experiments d. Poor black men were chosen as participantsarrow_forwardWhy don’t scientists usually consider viruses living? A.They do not have DNA B.They do not have cells C.They cannot reproducearrow_forward
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