Which event of fertilization occurs first?
A. the acrosomal reaction
B. the entry of sperm DNA into the egg
C. the cortical reaction
D. cleavage
E. vitelline layer hardens
Answer: A
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Fill in the blank(s) with correct word
Which molecule, a product of hemoglobin metabolism, does the liver excrete through bile?
a. alcohol b. bilirubin c. cholesterol d. bicarbonate e. urea
__________ is produced by the anterior lobe of the pituitary
a. Oxytocin b. Melatonin c. Growth hormone d. ADH e. Epinephrine
Children with hereditary retinoblastoma inherit a chromosome 13 from one parent that has which of the following defects in the RB gene?
A) insertion B) duplication C) inversion D) point mutation E) deletion