During protein synthesis in eukaryotes, which molecule passes from the nucleus to the cytoplasm and specifies the sequence of amino acids in the new polypeptide?
A. mRNA
B. tRNA
C. rRNA
D. RNA polymerase
E. DNA
Answer: A
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The activities of cells in different layers of the tubular gastrointestinal tract are regulated by clusters of nerves located in the submucosa. These nerve complexes are called
A. villi. B. serosa. C. epithelia. D. plexuses. E. muscularis.
Which of the following is made during a secondary active transport process?
a. glucose b. oxygen c. ATP d. carbon dioxide
Which of the following allows cells to recognize each other?
a. Glycolipids b. Protein channels c. Carbohydrates d. Cholesterol
What is a transgenic organism?
a. an organism with multiple copies of the same gene b. an organism that has genes from another species c. an organism that does not use DNA to specify proteins d. an organism that has had its entire genome sequenced e. an organism that has been DNA profiled