During Passage Through the Large Intestine, a Trophozoite Will Often

question 68

Multiple Choice

During passage through the large intestine, a trophozoite will often secrete a case around itself, forming a cyst. Cysts contain four haploid nuclei. When cysts "hatch" within a new host, two trophozoites are released. Thus, which of the following must happen within the cyst, prior to hatching?
1) meiosis
2) nuclear division
3) S phase
4) binary fission

• A) 1 only
• B) 1 and 2
• C) 2 and 3
• D) 2 and 4
• E) 2, 3, and 4

---

Definitions:

Lava Fountain

A fountain of molten lava propelled into the air by pressure and escaping gases.

Volcanic Dome

A rounded mound formed over a volcanic vent, created by the slow extrusion of viscous lava from a volcano.

Fissure

1. A fracture or crack on the land surface, such as that which forms by differential subsidence. 2. A magma-filled fracture in the subsurface that typically solidifies into a dike, or a linear volcanic vent erupting onto the land surface.

Volcanic Ash

Fine particles of rock and volcanic glass expelled into the air during a volcanic eruption.