Yeast is used to make bread rise by producing ___ during fermentation.
Fill in the blank(s) with the appropriate word(s).
Ans: CO2 gas
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Fossils indicate that the first cells were similar to
existing a. viruses. b. fungi. c. prokaryotes. d. eukaryotes. e. algae.
Which cannot be placed in a single trophic level?
a. an oak tree b. a zebra c. a mushroom d. a rabbit e. a lion
A significant event influencing the rapid evolution of plants on land after their initial appearance was the ____.
A. increase of atmospheric oxygen B. reduction of ultraviolet radiation penetration through the atmosphere C. stabilization of global climates D. increase in soil nutrients E. merging of land masses
Which of the following skin defenses and its mechanism is mismatched?
A. Lysozyme; hydrolyzes peptidoglycan in bacterial cell walls B. Keratinized surface; protein that provides waterproofing C. Antimicrobial peptides; disrupt positively charged bacterial membranes D. Sebum; lipid hydrolysis leads to toxic by-products that inhibit microbial growth