Textbook Question
In malaria, which stage occurs in red blood cells? __________
a. Liver phase
b. Erythrocytic cycle
c. Sporogonic phase
d. Amastigote cycle
Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
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Table of contents
- Ch. 1 - A Brief History of Microbiology31
- Ch. 2 - The Chemistry of Microbiology28
- Ch. 3 - Cell Structure and Function39
- Ch. 4 - Microscopy, Staining, and Classification25
- Ch. 5 - Microbial Metabolism51
- Ch. 6 - Microbial Nutrition and Growth37
- Ch. 7 - Microbial Genetics51
- Ch. 8 - Recombinant DNA Technology21
- Ch. 9 - Controlling Microbial Growth in the Environment36
- Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs21
- Ch. 11 - Characterizing and Classifying Prokaryotes29
- Ch. 12 - Characterizing and Classifying Eukaryotes34
- Ch. 13 - Characterizing and Classifying Viruses, Viroids, and Prions23
- Ch. 14 - Infection, Infectious Diseases, and Epidemiology35
- Ch. 15 - Innate Immunity34
- Ch. 16 - Adaptive Immunity21
- Ch. 17 - Immunization and Immune Testing29
- Ch. 18 - Immune Disorders22
- Ch. 19 - Pathogenic Gram-Positive Bacteria25
- Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli28
- Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios25
- Ch. 22 - Pathogenic Fungi47
- Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors44
- Ch. 24 - Pathogenic DNA Viruses23
- Ch. 25 - Pathogenic RNA Viruses30
- Ch. 26 - Applied and Industrial Microbiology29
- Ch. 27 - Microbial Ecology and Microbiomes22
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302Not the one you use?Change textbook
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Bauman 6th EditionCh. 23 - Parasitic Protozoa, Helminths, and Arthropod VectorsProblem 7
Bauman 6th EditionCh. 23 - Parasitic Protozoa, Helminths, and Arthropod VectorsProblem 7Chapter 23, Problem 7
Mark each statement as true or false. Rewrite the false statements to make them true by changing the underlined word(s).
__________ Humans can become intermediate hosts for Taenia saginata.
Verified step by step guidance1
Step 1: Understand the terminology. An intermediate host is an organism in which a parasite undergoes development but does not reach sexual maturity. A definitive host is where the parasite reaches sexual maturity and reproduces.
Step 2: Identify the life cycle of Taenia saginata. Humans are the definitive hosts because the adult tapeworm lives and reproduces in the human intestine.
Step 3: Determine the role of other hosts. Cattle act as the intermediate hosts, where the larval stage (cysticerci) develops in their muscles.
Step 4: Analyze the statement: 'Humans can become intermediate hosts for Taenia saginata.' Since humans are definitive hosts, this statement is false.
Step 5: Rewrite the false statement correctly by replacing 'intermediate' with 'definitive': 'Humans can become definitive hosts for Taenia saginata.'
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Life Cycle of Taenia saginata
Taenia saginata, the beef tapeworm, has a life cycle involving cattle as intermediate hosts and humans as definitive hosts. Humans acquire the adult tapeworm by consuming undercooked beef containing cysticerci, while cattle ingest eggs from human feces. Understanding this cycle clarifies host roles.
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Definitive vs. Intermediate Hosts
A definitive host harbors the adult, sexually mature parasite, while an intermediate host carries the larval or asexual stages. For Taenia saginata, humans are definitive hosts where the adult tapeworm lives, and cattle are intermediate hosts where larval cysticerci develop.
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Transmission and Infection in Taenia saginata
Transmission occurs when humans eat undercooked beef with cysticerci, leading to adult tapeworm infection. Humans do not serve as intermediate hosts because the larval stage does not develop in them. Recognizing transmission routes helps correct misconceptions about host roles.
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Related Practice
Textbook Question
The following helminths can directly penetrate the skin of humans to establish infection:, ____________ , _____________ , and ________________ (give genera only).
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Textbook Question
Of the parasitic helminths discussed in this chapter, the only one transmitted by mosquitoes is _____________ .
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Textbook Question
The definitive host for Toxoplasma gondii is __________.
a. humans
b. cats
c. birds
d. mosquitoes
Textbook Question
Tapeworms are generally transmitted via ______.
a. consumption of an intermediate host
b. consumption of the definitive host
c. vectors such as mosquitoes
d. consumption of adult tapeworms
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Textbook Question
A trematode that can be acquired by eating raw or undercooked vegetables is _____________ .
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