Which Statement About Sperm Is True

Multiple Choice

Which statement about sperm is true?

A) Species-specific recognition molecules that mediate interactions between egg and sperm are important primarily in species with internal fertilization.
B) Sea urchin sperm respond to peptides from eggs of the same species by swimming down the concentration gradient of the released peptide (from higher concentration to lower) .
C) Sea urchin sperm first penetrate the vitelline envelope and then the jelly coat surrounding the egg to reach the plasma membrane of the egg.
D) The acrosome, found in the tail of the sperm, helps propel the sperm forward.
E) Sea urchin eggs produce species-specific peptides that bind to sperm, causing increased activity and mitochondrial respiration.