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
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
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