________ molecules deliver amino acids to ribosomes during translation.
A. Ribosomal RNA (rRNA)
B. Transfer RNA (tRNA)
C. Messenger RNA (mRNA)
D. Heterogeneous nuclear RNA (hnRNA)
Answer: B
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Life is thought to have evolved from complex molecules formed by the interaction of smaller molecules in oceans and the atmosphere. The substance which brought these molecules together to interact is
A. buffers. B. acids. C. water. D. salts. E. hydrogen.
Except for a shallow surface layer, the earth's crust is known to be free of microorganisms.
Answer the following statement true (T) or false (F)
A long established population that has had no new individuals entering the population would be
considered to be in: a. genetic stasis. b. genetic equilibrium. c. population stability. d. allelic disequilibrium e. allele balance.
What do veins have that arteries lack?
a. a tunica externa b. oxygenated blood c. an inner membrane of endothelium d. blood flowing from the heart e. valves