Since men produce millions of sperm, but women produce only one oocyte per cycle, in the vast majority of cases infertility is due to a problem with the woman.
Answer the following statement true (T) or false (F)
False
In human couples with infertility, about 40% of the cases can be attributed to the man, about 45% to the woman, and the rest are unexplained. To be fertile, a man needs to produce a massive number of morphologically and genetically normal sperm.
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Cytokinesis in plant cells differs from cytokinesis in animal cells because
a. the contractile protein, actin, is important only in plant cells. b. a contractile ring forms only in plant cells. c. in plant cells, the cell plate must also divide into two parts. d. plant cells have a rigid cell wall. e. there is no difference.
Which ions accumulate in the outer compartment of the
mitochondria during electron transport phosphorylation? a. calcium b. hydrogen c. oxygen d. phosphorus e. sodium
In DNA fingerprinting, scientists look for different lengths of these DNA pieces as an indicator of differences in VNTRs.
A. primer molecules B. point mutation C. Eco RI Restriction Sites D. restriction fragments
That the ancient Earth's atmosphere lacked oxygen was beneficial because oxygen combines with organic molecules to prevent them from forming polymers.
a. true b. false