Down syndrome (trisomy-21) results from __________.
A. a mutagen
B. nondisjunction
C. a teratogen
D. a sex-linked mutation
E. an autosomal recessive allele
B. nondisjunction
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The smaller muscular arteries and arterioles change their diameter in response to local conditions or to ________.
Fill in the blank(s) with the appropriate word(s).
Vitamin A, a fat-soluble vitamin, would move across the plasma membrane into the cell
A. through vitamin membrane channels. B. in vesicles. C. by dissolving in the lipid bilayer. D. by active transport. E. by transport with carrier molecules.
What does the embryonic neural tube develop into?
A. The digestive tract B. The liver and spleen C. The brain and spinal cord D. The vertebrae E. The brain, spinal cord, and vertebrae
This type of membrane protein extends across the entire lipid bilayer of the plasma membrane touching both intracellular fluid and the extracellular fluid
a) complement protein b) transmembrane protein c) peripheral protein d) lipoprotein e) All of these choices are correct.