Presence of testosterone induces a human embryo to develop as a _____ by promoting development of the _____ ducts.

Fill in the blank(s) with the appropriate word.


Ans: male; Wolffian

Biology & Microbiology

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Alleles are alternate molecular forms of a gene

A. true B. false

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Which of these is the correct formula discussed by Dr. Knoll in the Great Oxygenic Event module (stage 2, click on "Howie")?

A. H2 + O --> H2O B. CO2 + H2O --> CH2O + O2 C. CH4 + 2O2 --> CO2 + H2O

Biology & Microbiology

If a respiratory surface dries out, gas exchange will

A) decrease for carbon dioxide but increase for oxygen. B) not occur. C) increase. D) decrease for oxygen but increase for carbon dioxide. E) not be affected.

Biology & Microbiology

Group of same species live in an area is

a. community b. ecosystem c. population

Biology & Microbiology