The four-chambered heart first evolved among the:a
arthropods.
b. birds.
c. nonavian reptiles.
d. mammals.
e. fishes.
c
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Which of the following is a difference between chlorophyll a and chlorophyll b?
A) Chlorophyll a is a pigment, and chlorophyll b is the enzyme that transfers excited electrons from chlorophyll a to electron carriers of the thylakoid membrane. B) Chlorophyll a absorbs yellow light, and chlorophyll b absorbs green. C) Chlorophyll a contains magnesium in its ring structure, whereas chlorophyll b contains iron. D) Chlorophyll a and b absorb light energy at slightly different wavelengths.
Immunological memory accounts for _____
A) the human body's ability to distinguish self from non-self B) the observation that some strains of the pathogen that causes dengue fever cause more severe disease than others C) the ability of a helper T cell to signal B cells via cytokines D) the ancient observation that someone who had recovered from the plague could safely care for those newly diseased
When exposed to water, sodium chloride (NaCl) ____.
A. dissolves into Na+ and Cl- ions B. crystallizes into a solid C. dissolves into Na- and Cl+ ions D. crystallizes into a liquid E. forms a hydrophobic compound
According to NFPA, rehab should be required after a fire fighter has consumed ____ 30-minute SCBA bottle(s).
a. 4 b. 1 c. 2 d. 3