Yeast is used to make bread rise by producing ___ during fermentation.

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


Ans: CO2 gas

Biology & Microbiology

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Fossils indicate that the first cells were similar to

existing a. viruses. b. fungi. c. prokaryotes. d. eukaryotes. e. algae.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology