The Campylobacter spp. are
A) aerobes.
B) anaerobes.
C) microaerophiles.
D) facultative anaerobes.
Answer: C
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Erythrocytes are the most numerous cells in human blood
Indicate whether the statement is true or false.
An opportunistic pathogen_____
a. can cause disease when it is transferred to another site in the body b. only causes disease in immunocompromised individuals c. is a part of the resident biota d. is another term for true pathogen e. usually chooses not to cause disease
A healthy person can normally exhale what percentage of his or her vital capacity in one second?
A) 80 B) 50 C) 10 D) 100 E) 20
H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together
He exposed two species of differently pigmented sponges to a chemical that disrupted the cell-cell interaction (cell junctions), and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species. How do you explain the results of Wilson's experiments? A) The two species of sponge had different enzymes that functioned in the reassembly process. B) The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment. C) The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge. D) One cell functioned as the nucleus for each organism, thereby attracting only cells of the same pigment.