During unfavorable growth conditions, many protozoa can convert to a resistant, dormant stage called a ________.
Fill in the blank(s) with the appropriate word(s).
cyst
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What structure may have acted as a boundary for a cell-like environment before protocells formed?
a. acidic water from volcanic springs b. chambers in rocks c. metal ions from rocks d. clay e. lipid membrane
A mechanism of gene regulation that controls the amount of mRNA available for translation is
_____________. Fill in the blank(s) with the appropriate word(s).
Currently, the most effective method of reversible birth control is:
a. spermicide
b. an IUD. c. injectable contraceptives. d. oral contraceptives. e. a condom
Some of the unique adaptations of angiosperms include their beneficial relationships with ________ and their relatively ________
A) animals; dominant gametophyte generation. B) animals; rapid fertilization and seed production C) fungi; large sporophyte D) fungi; well-developed vascular system