Aminoacyl-tRNA synthetases link ____ to their respective tRNA molecules by ____ bonds
a. amino acids; ionic
b. amino acids; hydrogen
c. amino acids; covalent
d. codons; covalent
e. anticodons; hydrogen
d
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Which of the following statements about the movement of oxygen and carbon dioxide in complex multicellular organisms is true?
A. Their movement by diffusion into and out of cells is limited to just a few layers of cells. B. They are moved into and out of cells by specific transport proteins. C. Bulk transport systems are required in macroscopic organisms to facilitate the transport of carbon dioxide and oxygen.
What kind of molecules can readily cross the lipid bilayer?
a. Small, charged b. Small, uncharged c. Large or small, uncharged d. Small, charged or uncharged
The structural and functional unit of nervous tissue is the
A) dendrite. B) axon. C) neuron. D) nerve.
Based on the phylogeny shown, choose the true statement about evolutionary relationships.
A. Oak is equally related to rose and pine. B. Fern is equally related to ginkgo and oak. C. Ginkgo is more closely related to oak than rose. D. Fern is more closely related to pine than to rose.