Each DNA double helix has a backbone that consists of alternating ____.
A. covalent and ionic bonds
B. nitrogen-containing bases
C. hydrogen bonds
D. sugar and phosphate molecules
E. covalent and hydrogen bonds
Answer: D
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Microbially produced glycolipid surfactants are used for
A. emulsification and increasing detergency, which aids in biodegradability. B. prevention or reduction of microbial growth on surfaces, decreasing transmission of disease. C. solubilization of hydrophobic compounds, which enhances cleanup and recovery of oil from spills. D. both emulsification and increasing detergency and solubilization of hydrophobic compounds. E. both emulsification and increasing detergency and prevention or reduction of microbial growth on surfaces.
In all plants, gametes unite at fertilization to form a ____
a. spore b. gametophyte c. sporophyte d. zygote e. seed
The cohesiveness between water molecules is due largely to:
a. ionic bonds. b. hydrogen bonds. c. polar covalent bonds. d. nonpolar covalent bonds. e. hydrophobic interactions.
A consequence of the way hormones, as compared to neurotransmitters, get to their target cells is that hormones:
A) cannot maintain homeostasis. B) must be larger molecules. C) would be slower to act. D) must be proteins. E) can be lipids.