Ephedrine is a stimulant that is derived from a member of the phylum
A. Pterophyta.
B. Hepaticophyta.
C. Cycadophyta.
D. Gnetophyta.
Answer: D
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Cardiac muscle cells are
a. involuntary. b. spindle-shaped. c. multinucleated. d. slow contracting. e. all of these
Radioisotopes
a. are unstable and emit energy and particles to stabilize themselves. b. are different elements from the "standard" elements. c. are very stable and do not change over time. d. contain more electrons than the "standard" element. e. contain less electrons than the "standard" element.
One hypothesis for why we age, or at least why our cells age, is that every time that mitosis occurs, ________ at the ends of chromosomes shorten, and eventually the cell runs out of these units at the ends of chromosomes
Fill in the blank(s) with correct word
After cell division, some cells become differentiated. This means that they
A. become different shapes. B. become different sizes. C. perform different functions. D. become different in all these ways.