Cellulose microfibrils give the plant cell wall its tensile strength.
a. true
b. false
Ans: a. true
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Crenarchaeotes whose optimal growth temperature is over 80 °C are called
A) hyperthermophiles. B) thermophiles. C) extreme halophiles. D) halophiles.
Simple diffusion of molecules occurs ________.
a. from an area of lesser concentration to an area of greater concentration b. in non-living systems as well as living systems c. across plasma membranes only through transport proteins
The NPK percentages on a package of fertilizer refer to the _____
A) percentages of manure collected from different types of animals B) relative percentages of organic and inorganic nutrients in the fertilizer C) percentages of three important mineral nutrients D) proportions of three different nitrogen sources
Alexander Fleming discovered the compound penicillin in 1928 after his observations on the antibacterial effects of the mold Penicillium chrysogenum on which of the following microbes?
A) Staphylococcus aureus B) Escherichia coli C) Saccharomyces cerevisiae D) Salmonella enterica