The ____________________ takes up and releases calcium during muscle contraction and relaxation. Fill in the blank(s) with the appropriate word(s)
ANSWER: sarcoplasmic reticulum
Biology & Microbiology
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The sporophyte is the dominant and conspicuous generation in
(a) the fern allies and ferns. (b) gymnosperms. (c) flowering plants. (d) all of the above.
Biology & Microbiology
Which of these can found in oak wood but not in pine wood?
A. secondary xylem B. secondary phloem C. vessel members D. tracheids E. ray cells
Biology & Microbiology
Letter “B” designates the ____, which allowed for an increase in human population growth
a. Bubonic plague b. domestication of plants and animals c. industrial and scientific revolutions d. discovery of America e. emergence of agriculturally based urban societies
Biology & Microbiology
The letter B" in the above figure represents its
a. shell. b. mantle. c. gills. d. siphon. e. none of these
Biology & Microbiology