A hydrogen bond is an attraction between a(n) ____ hydrogen atom and another hydrogen atom taking part in ____
a. covalently bonded; the same polar covalent bond
b. ionically bonded; the same polar covalent bond
c. covalently bonded; a separate polar covalent bond
d. ionically bonded; a separate nonpolar covalent bond
e. nonpolar covalently bonded; a separate nonpolar covalent bond
ANSWER: c
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In a malarial infection, only sporozoites can infect the human liver
Indicate whether this statement is TRUE or FALSE.
Bacteria
a. are diploid organisms. b. produce gametes. c. have a life cycle that varies between unicellular stage and multi-cellular stage. d. have a single circular chromosome. e. lack either DNA or RNA
A grassland biome
A. consists of mostly coniferous trees. B. has nutrient-rich soil. C. has a long growing season. D. is warm and dry. E. consists of moss and lichen.
Antibodies are proteins produced by the body. Antibiotics are prescription medications that can kill or inhibit the growth of microorganisms. How are antibodies different from antibiotics?
A) Unlike antibodies, antibiotics are useful against all pathogens. B) The body depends on antibodies, but not antibiotics, as its first line of defense. C) Unlike antibiotics, antibodies can help protect the body against viral pathogens. D) The body can make antibiotics, but not antibodies.