Use the Following Information to Answer the Question

question 70

Multiple Choice

Use the following information to answer the question.
Giardia intestinalis is an intestinal parasite of humans and other mammals that causes intestinal ailments in most people who ingest the cysts. Upon ingestion, each cyst releases two motile cells, called trophozoites. These attach to the small intestine's lining via a ventral adhesive disk. The trophozoites anaerobically metabolize glucose from the host's intestinal contents to produce ATP. Reproduction is completely asexual, occurring by longitudinal binary fission of trophozoites, with each daughter cell receiving two haploid nuclei (n = 5) . A trophozoite will often encyst as it passes into the large intestine by secreting around itself a case that is resistant to cold, heat, and dehydration. Infection usually occurs by drinking untreated water that contains cysts.
The cysts of Giardia function most like the ________.

• A) mitochondria of ancestral diplomonads
• B) nuclei of archaeans
• C) endospores of bacteria
• D) capsids of viruses

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Definitions:

Condyle

A rounded projection on a bone, typically at the joint, where it connects with another bone.

Trochanter

A large, bony prominence found on the femur, serving as a major attachment point for muscles.

Fossa

A depression or hollow, often found in bones or in the body, serving various purposes like accommodating muscles or organs.

Sinus

A cavity within a bone or other tissue, most commonly found in the nose and respiratory system.