Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 42, Problem 5MC
Summary Introduction

Introduction:

Sexually transmitted diseases (STDs) are the diseases that are transmitted from one person to another during sexual activity. The causative agents of STDs may be viruses, bacteria, fungi, and parasites. Some examples of STDs are gonorrhea, AIDS, syphilis, genital herpes.

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a. Why is it necessary for most parasites to leave their host to complete the life cycle? b. What are some ways to prevent completion of the life cycle? c. What is the benefi t to parasites of having numerous hosts? d. What are the disadvantages in having more than one host?
Bats found with white-nose syndrome appeared to die because:   a the fungal infection affected their wings so they could no longer fly b the fungal infection attacked the areas needed to maintain body temperature, so the bats froze to death c the fungal infection caused them to wake more often and use up their fat reserves, so they died of starvation d their immune system was suppressed, so they contracted other deadly infections e their torpor became so deep they could not wake from their hibernation
Which parasitic protist evades the host immune system by altering its surface proteins with each generation? a. Paramecium caudatum b. Trypanosoma brucei c. Plasmodium falciparum d. Phytophthora infestans
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