The term "precursor metabolite" refers to molecules that
A. activate cell components.
B. are used in biosynthesis.
C. result from cell activities.
D. are present but inactive.
B
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Thermoreceptors detect
a. chemical substances. b. pressure changes. c. temperature changes. d. light wavelengths. e. changes in solute concentration.
Select the membrane molecule that is made up of a polar region with two nonpolar fatty acid tails.
A. transmembrane proteins B. cell surface proteins C. carbohydrate chains D. phospholipids
This occurs when insertions or deletions cause the ribosome to read the wrong sets of three nucleotides.
A. point mutation B. frameshift C. translocation D. transcription
Oligotrophic lakes are characterized by
A) low oxygen concentrations. B) dense "blooms" of algae. C) low nutrient levels, and clear water with deep penetration of light. D) high nutrient levels, murky water, and shallow penetration of light. E) the largest number and diversity of organisms.