To subgroup the lactic acid bacteria, which are incapable of aerobic degradation and only do fermentation, identifying products formed is a useful way to distinguish homofermentative versus heterofermentative lactic acid bacteria
Indicate whether the statement is true or false.
Answer: TRUE
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The relative impermeability of membranes to watersoluble
molecules is a result of the a. nonpolar nature of water molecules. b. presence of large integral membrane proteins. c. presence of inorganic salt crystals scattered through some membranes. d. presence of cutin and lignin in the membranes. e. presence of phospholipids in the lipid bilayer.
A probable sequence of the evolution of cells was
A. autotroph ® aerobic heterotroph ® anaerobic heterotroph. B. anaerobic heterotroph ® aerobic heterotroph ® autotroph. C. anaerobic heterotroph ® autotroph ® aerobic heterotroph. D. aerobic heterotroph ® autotroph ® anaerobic heterotroph.
Among non-mammalian vertebrates, the cloaca is an anatomical structure that functions as _____
A) a specialized sperm-transfer device produced only by males B) a shared pathway for the digestive, excretory, and reproductive systems C) a source of nutrients for developing sperm in the testes D) a gland that secretes mucus to lubricate the vaginal opening
The bases of each strand of a double helix are paired with bases on the other strand, so each strand of DNA is said to be ________ to the other
Fill in the blank(s) with correct word