Asexual amplification, called merogony, is associated with the life cycle of which organism?
a. Cyclospora
b. Cryptosporidium
c. Toxoplasma
d. Sarcocystis
B
Cryptosporidium infections begin with the ingestion of viable oocysts. Upon contact with gastric and duodenal fluids, four sporozoites are released from each oocyst. They invade the epithelial cells and develop to trophozoites, surrounded by a parasitophorous vacuole. Within the epithelial cells, trophozoites undergo two or three generations of asexual amplification, called merogony, leading to the formation of different types of meronts that contain four to eight merozoites. The latter differentiate into sexually distinct stages in a process called gametogony.
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The signaling molecule involved in juxtacrine cell signaling is:
A. a small soluble peptide. B. a neurotransmitter. C. a transmembrane protein. D. a growth factor.
During signal transduction of a G protein, the first messenger binds to the receptor, and the G protein is activated
What happens next? a. formation of cAMP b. cellular response c. activation of protein kinase d. activation of adenylyl cyclase e. phosphorylation of the G protein
Bacteria that have flagella distributed all over the cell surface are described as (having)
A) monotrichous. B) periplasmic flagella. C) lophotrichous. D) amphitrichous. E) peritrichous.
Stage 1 glycolysis will break down glucose into what?
What will be an ideal response?