Place the following events of fertilization in the correct chronological order.
(1) Sperm contacts the cumulus mass.
(2) Proteolytic enzymes are released from the acrosome.
(3) Sperm contacts the plasma membrane of the ovum.
(4) Sperm passes through the zona pellucida.
(5) Sperm increase ATP production.
A. 5,1,2,4,3
B. 1,5,4,3,2
C. 1,2,4,3,5
D. 5,2,4,3,1
E. 3,5,2,1,4
A. 5,1,2,4,3
You might also like to view...
Tetanus antitoxin is
A. antibody against the bacteria. B. inactivated toxin. C. inactivated bacteria. D. antibody against the toxin
What is the function of gap junctions in cells?
a. Anchor the cells to basal lamina. b. Hold the cell wall close to the plasma membrane. c. Allow ions and small molecules to flow freely between cells of a given tissue type. d. Serve as a scaffold for active transport proteins to cluster together. e. Anchor the cells to neighboring cells.
Sea cucumbers will __________ when environmental conditions deteriorate
a. eject their digestive tract, respiratory structures, and gonads. b. crawl to an area with more favorable conditions. c. form a resistant spore. d. float to the surface and then later drop to a more favorable location. e. crawl deep into the ocean mud on the bottom.
Trematodes (flukes) have a digestive tube that ends in one or more pouches called caeca.
a. true b. false