Aminoacyl-tRNA synthetases catalyze covalent addition of ________ ________ to tRNAs.
Fill in the blank(s) with the appropriate word(s).
amino acids
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Marine snow refers to:
a. neston. b. seston. c. cobwebby aggregates of mucus. d. fecal pellets. e. necktonic organisms.
Which statement best reflects the current understanding of pollen tube elongation?
a. It is not even known if pollen tube growth uses chemical signals or is completely random. b. Pollen tube elongation will occur as long as the pistil provides moisture and energy. c. While it is known that chemical cues from female tissues help guide pollen tube growth, the identity of these chemicals is not known. d. Nearly all of the details of the chemical interactions between the pollen tube and pistil tissue are known.
What initiates the sodium-potassium pump?
A. two potassium ions are transported into the cell. B. ATP binds to the protein which becomes phosphorylated (ADP is released). C. phosphorylated pump has low affinity for sodium allowing sodium to leave and potassium to bind. D. three sodium ions bind to the cytoplasmic side of the protein. E. three sodium ions are translocated out of the cell.
Cladistics is a method of determining the age of fossils
a. true b. false