The most distinctive characteristic of leaf mesophyll cells is that they are filled with
A. oxygen bubbles.
B. stomata.
C. central vacuoles.
D. veins.
E. many chloroplasts.
Answer: E
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A) salivary amylase B) pepsidase C) pancreatic lipase D) secretin
The bony movable ?ap that covers the gills and gill slits is called the
(a) operculum. (b) cranium. (c) tympanum. (d) colon.
tRNA differs from other types of RNA because
it
a. acts as an enzyme. b. is only involved in transcription. c. carries amino acids. d. codes for multiple amino acids. e. is complexed with a protein
In an atom, the number of neutrons determines most specifically the ________
A) element B) isotope C) ion state D) chemical properties