Sperm cells are able to move in a swimming motion by the use of ________.
A. centrioles
B. cilia
C. vesicles
D. flagella
Answer: D
You might also like to view...
In smooth muscle, bundles of filaments attach to the plasma membrane at points referred to as __________
Fill in the blank with correct words.
Cholesterol, though it is not an energy molecule, has importance in the body because it ________.
A) is a stabilizing component of the plasma membranes and is the parent molecule of steroid hormones B) helps provide essential nutrients to the brain and lungs C) helps mobilize fats during periods of starvation D) enters the glycolytic pathway without being altered
Jeremy cannot ejaculate because of an injury he sustained in a car accident. An assisted
reproductive technology that might help him to become a biological father is A) intrauterine insemination using donor sperm. B) intracytoplasmic sperm injection using his sperm into his partner's secondary oocyte. C) a surrogate mother. D) gamete interfallopian transfer.
Urea
a. is a waste product resulting from the breakdown of protein. b. is passively reabsorbed at the end of the proximal tubule down a urea concentration gradient created by the osmotic-induced reabsorption of water from the proximal tubule. c. recycling between the late portion of the collecting tubule and the long loops of Henle contributes to medullary hypertonicity. d. both (a) and (b) above. e. all of these answers.