Why are most sexually transmitted diseases (STDs) transmitted only by intimate person-to-person contact?
What will be an ideal response?
Answer: Most STDs are sensitive to environmental stressors such as drying, heat, and light. The genitourinary tract where the pathogens thrive is protected against these stressors, so most are not able to adapt to other environments. Bodily fluids from the genitourinary tract are usually the only environment where they remain viable pathogens, so intimate contact is generally required to obtain STDs.
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Members of the ____ flatworm lineage are vertebrate endoparasites;some, called blood flukes, cause an often deadly
disease in humans called schistosomiasis.
a. Trematoda b. Turbellaria c. Polychaeta d. Cestoda e. Hirudinea
Which organelle or structure is absent in plant cells?
A) mitochondria B) microtubules C) centrosomes D) peroxisomes
Write an equation that describes a situation in which a population remains stable
What will be an ideal response?
Rimantadine is an effective antimicrobial agent against:
A) viruses B) protozoa C) bacteria D) fungi