試題詳解

42. Which one of the following statements is not true?
(A) The development of body organs of a human embryo mainly occurs in the first 3 months of pregnancy.
(B) During human pregnancy, the function of mucus plugs in the cervix is to prevent a second fertilization.
(C)About 24 hrs after fertilization, the zygote begins to divide by mitosis without changes in embryo size.
(D) In human pregnancy, the mother's blood contains DNA from the fetus.
(E)All of the above.