Gametangia are
a. chlorophyll-producing structures.
b. sex organs.
c. a name for colony-forming algae.
d. found in slime molds.
b
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____________________ is the recommended ART procedure performed on women with blocked oviducts
Fill in the blank(s) with correct word
Heavy metals may inactivate proteins by reacting with their sulfhydryl groups.
Answer the following statement true (T) or false (F)
For E. coli cells, the sugar lactose acts as an inducer. In general, an inducer:
A: binds to the promoter and prevents the repressor from binding to the operator. B: stimulates the synthesis of the needed enzyme(s). C: binds to the operator and prevents the repressor from binding at this site. D: inhibits the synthesis of the needed enzyme(s). E: is the same as a promoter.
Most populations tend to
A. produce only the number of offspring needed for replacement. B. produce many more offspring than needed for replacement. C. have more females than males. D. have more males than females.