In spermatozoa, a structure called the acrosome:
a. Contains dynein arms that control sperm motility
b. Contains proteolytic enzymes that function during fertilization of an ovum by sperm
c. Is a focal accumulation of rough endoplasmic reticulum
d. Localizes around mitochondria in the midpiece of the flagellum
e. Regulates the condensation of nuclear DNA
ANS: B
The acrosome contains enzymes that are utilized by a mature spermatozoon to penetrate the bar-riers surrounding the oocyte.
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A. ischial tuberosity. B. symphysis pubis. C. iliac fossa. D. sacroiliac joint. E. anterior superior iliac spine.
Which condition is characterized by a malignant tumor of the bone?
A. Osteosarcoma B. Mastoiditis C. Osteomyelitis D. Chondrosarcoma
At which stages does the chromosome number double?
A) prophase B) metaphase C) interphase D) telophase
The tympanic membrane separates an air-filled chamber from a fluid-filled chamber
Indicate whether the statement is true or false.