Amino acids are joined together in a chain by ____________________ bonds. Fill in the blank(s) with the appropriate word(s)
ANS: peptide
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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.
If the protective coverings of the brain were damaged, the ____ would be damaged
a. ventricles b. thalamus c. medulla d. meninges e. reflexes
Includes osteogenic cells, osteoblasts, osteocytes, bone-lining cells, osteoclasts, and osteoid. Osteoid, which makes up one third of organic bone matrix is secreted by osteoblasts. Consists of ground substance and collagen fibers which contribute to high tensile strength and flexibility of bone.
What will be an ideal response?
Triclosan, a chemical in most "antibacterial" soaps,
A) is considered to be the "miracle antiseptic" in household use. B) has led increased resistance of microbes to other antibacterial agents. C) is superior to regular soap and water. D) kills fungi and viruses as well as bacteria.