In an egg cell treated with EDTA, a chemical that binds calcium and magnesium ions, the
A) acrosomal reaction would be blocked.
B) fusion of sperm and egg nuclei would be blocked.
C) fast block to polyspermy would not occur.
D) fertilization envelope would not be formed.
E) zygote would not contain maternal and paternal chromosomes.
Answer: D) fertilization envelope would not be formed.
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Which of the following individuals is considered to be the “Father of Microbiology”?
A) Anton van Leeuwenhoek B) Louis Pasteur C) Robert Koch D) Rudolf Virchow
The major difference between the human male and female reproductive systems is the ____
a. site for fertilization and embryo development in the female b. production of haploid gametes only by the male c. diploid polar bodies of the female d. generation of millions of eggs but only thousands of sperm each month e. presence of a duct system opening to the body's exterior only in females
Which of the following do the Kuna suffer
very little from? a. Hypertension. b. Yellow fever. c. Malaria. d. Dengue fever. e. They suffer little from any of these.
Water flowing over fish gills exchanges gases with
blood flowing in the opposite direction inside gill capillaries. This is called__________.