The ________ of a spermatozoon contains the nucleus of the cell
A) middle piece
B) tail
C) acrosome
D) head
D
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Macrophages ingest invaders
Indicate whether the statement is true or false.
Select the correct statement regarding epithelia.
A) Simple epithelia form impermeable barriers. B) Stratified epithelia are tall, narrow cells. C) Stratified epithelia are present where protection from abrasion is important. D) Pseudostratified epithelia consist of at least two layers of cells stacked on top of one another.
In a taste bud, which cell produces a receptor potential?
A. Basal cells B. Sensory nerve fibers C. Supporting cells D. Taste cells E. Taste hairs
The model that describes how an enzyme can adjust its shape to fit the shape of the substrate is the ________ model.
A. lock-and-key B. enzyme-substrate C. conformational D. induced-fit