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.
C
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A. subunit ? B. subunit ? C. subunit ? D. subunit ? E. subunit ?'
Peptic ulcers are most closely related to what
type of cell junctions?
a. tight junctions b. strong adhering junctions c. gap junctions d. plasmodesmata e. both strong adhering junctions and gap junctions
Which of the following describes how an acid disrupts the chemical bonds of molecules in a cell?
a. The H+ ions can disrupt hydrogen bonds as the slightly negative portion of the molecule is more attracted to H+ ions than to the hydrogen that was part of the bond. b. The H+ ions can disrupt hydrogen bonds as the slightly positive portion of the molecule is more attracted to H+ ions than to the hydrogen that was part of the bond. c. The OH- ions can disrupt hydrogen bonds as the slightly positive portion of the molecule is more attracted to H+ ions than to the hydrogen that was part of the bond. d. The OH- ions can disrupt hydrogen bonds as the slightly negative portion of the molecule is more attracted to H+ ions than to the hydrogen that was part of the bond. e. The H+ ions disrupt the covalent bonds that hold the molecule together.
Woese developed the three-domain system based on differences in organisms'
A. cell morphologies. B. rRNA sequences. C. Gram stain reactions. D. habitats.