A flagellum moves a cell through a fluid medium. What moves the fluid medium across the surface of cells that are not free to move?
A) centrioles
B) endoplasmic reticulum
C) cilia
D) ribosomes
E) thick filaments
C) cilia
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All pathogens only have one site of determinant
Indicate whether the statement is true or false
Which extraembryonic structure is created as migrating mesodermal cells form a layer beneath the trophoblast, separating it from the blastocoele?
A) amnion B) placenta C) allantois D) yolk sac E) chorion
Which statement is true regarding the action of an oligodendrocyte?
A. Oligodendrocytes function only within the PNS. B. Each oligodendrocyte can form a myelin sheath around many axons simultaneously. C. Each oligodendrocyte can wrap only a 1mm portion of a single axon. D. An oligodendrocyte is responsible for forming part of the blood-brain barrier. E. A neurolemmocyte attacks pathogens.
Amplification during a second-messenger cascade is beneficial because amplification:
A. takes small molecules and makes polymers out of them. B. results in the production of more of the first messenger. C. allows a cell to respond to more different hormones. D. allows small amounts of hormones to produce large responses in target cells.