A process that requires cellular energy to move a substance against its concentration gradient is called
A) active transport.
B) passive transport.
C) facilitated transport.
D) osmosis.
E) diffusion.
Answer: A
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Muscles that attach to bone at one end and skin at another include which of the following?
A. The sphincters B. The piloerector muscles C. The multifidus muscles D. The muscles of facial expression E. The lumbricals
Stages of the cell cycle unfold in the following order:
A) interphase, differentiation, cytoplasmic division, mitosis B) differentiation, cytoplasmic division, mitosis, interphase C) mitosis, interphase, cytoplasmic division, differentiation D) interphase, mitosis, cytoplasmic division, differentiation
Which of the following is a contraceptive method that not only prevents fertilization but also provides protection against sexually transmitted diseases?
A. Oral contraceptives B. Diaphragm C. Spermicidal agents D. Condom
The ridge that is visible externally along the midline of the scrotum is called the
A. septum. B. raphe. C. perineum. D. tunica albuginea. E. scrotal cord.