More _____ need to be studied in order to find out whether interspecific competition strongly influences the species
composition and structure of most communities.
a. communities
b. K-selected species
c. r-selected species
d. predators
e. prey species
ANSWER: c
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Reaction centers ONLY indirectly receive photon energy via light-harvesting molecules
Indicate whether the statement is true or false.
During which phase(s) of aerobic respiration is ATP produced directly by substrate-level phosphorylation?
a. glycolysis only b. Krebs cycle only c. acetyl CoA formation only d. the Krebs cycle and glycolysis e. glycolysis, acetyl CoA formation, and Krebs cycle
In a fish population in a shallow stream, the genotypic frequency of yellowish-brown fish and greenish-brown fish changed significantly after a flash flood randomly swept away individuals from that stream. This change in genotypic frequency is most likely attributable to
a) gene flow b) disruptive selection c) directional selection d) genetic drift e) natural selection
Skeletal muscle H zones are composed of ____
a. discs to which thin filaments are anchored b. stacked thick filaments along with the parts of thin filaments that overlap both ends c. thin filaments but no thick filaments d. thick filaments but no thin filaments e. stacked thin filaments along with parts of thick filaments that overlap both ends