Which of the following statements is TRUE regarding a gastrovascular cavity?
A) Ingestion and elimination occur through a single opening.
B) Digestion occurs in specialized chambers.
C) Digestion is unnecessary because of the small size of the particles absorbed.
D) Absorption occurs within collar cells.
E) Digestion is exclusively intracellular.
A
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Which of the following is released when an aminoacyl-tRNA synthetase charges a tRNA?
A. mRNA B. ATP C. AMP D. pyrophosphate E. AMP and pryophosphate
Which of the following cells is NOT haploid?
a. secondary spermatocyte b. sperm c. primary oocyte d. spermatids e. polar bodies
Eosinophils are especially important in defending the human body from infection by
A) bacteria. B) viruses. C) molds. D) large parasites. E) any type of microorganism.
A membrane is NOT necessary in
A. diffusion. B. phagocytosis. C. active transport. D. osmosis.