Which of the following monomer building blocks is necessary to assemble selectively permeable boundaries around and inside cells?
(a) sugars
(b) fatty acids
(c) amino acids
(d) nucleotides
(b)
You might also like to view...
Which molecule combines with proteins to form both the large and small ribosomal subunits?
A. DNA B. RNA polymerase C. miRNA D. rRNA E. tRNA
What is the primary function of the transverse tubules?
A. Conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils. B. Act as a channel for Ca2+ ions during excitation-contraction coupling. C. Form cross-bridges between actin and myosin during muscle contraction. D. Attach troponin to tropomyosin. E. Attach muscle fibers to skeletal elements to exert force.
Lianas and epiphytes are especially common in the:a
tropical rain forest. b. savanna. c. temperate grassland. d. chaparral. e. taiga.
The habitats most favorable for the growth of legumes in symbiosis with nitrogen-fixing bacteria are
A. calcium-poor soils. B. nitrogen-poor soils. C. phosphorus-poor soils. D. manganese-poor soils. E. potassium-poor soils.