Phospholipids are important components of the plasma membrane. What does "E" represent on the diagram?
A. phosphorus
B. oxygen
C. nitrogen
D. polar (hydrophilic) region
E. nonpolar (hydrophobic) region
B
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Which is not correct regarding the penis?
A. The penis is the male copulatory organ. B. The root of the penis is attached to the pubic arch. C. The prepuce is removed during circumcision. D. The enlarged proximal end is called the glans. E. The body of the penis contains the corpora cavernosa and corpus spongiosum.
The neural arch is formed by the
A. two pedicles and two laminae. B. two pedicles, two laminae, and body. C. two pedicles and body. D. two laminae and body.
The ________ are the photoreceptors responsible for night vision.
Fill in the blank(s) with the appropriate word(s).
On the pH scale, which number has the highest concentration of hydrogen ions?
A) pH 10 B) pH 1 C) pH 7 D) pH 5