Proteins must have more than one _______ to have a quaternary structure.
a. alpha helix
b. beta pleated sheet
c. polypeptide chain
d. transmembrane segment
Ans: c. polypeptide chain
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Which sequence of events is most CORRECT for the initiation and elongation steps of translation?
(1) initiator tRNA binds start codon on mRNA (2) small ribosomal subunit binds to mRNA (3) large ribosomal subunit binds (4) tRNA entry and peptidyl transfer reaction (5) translocation of ribosome and release of tRNA A. 1, 2, 3, 4, 5 B. 1, 2, 3, 5, 4 C. 1, 3, 2, 4, 5 D. 2, 3, 1, 5, 4 E. 2, 1, 3, 4, 5
Which of the following is a characteristic of most eudicots?
a. Trisulcate pollen b. Scattered vascular tissue c. Parallel veins in leaves d. One cotyledon
The primary function of DNA ligase is to
a. cut the two strands of DNA molecule prior to replication. b. attach free nucleotides to a growing chain. c. remove bases that might have been inserted incorrectly. d. seal any tiny gaps in the new DNA. e. fragment old DNA that is no longer of use to the cell.
Your statement, "If taken at the beginning of a cold, Echinacea will reduce cold symptoms," is called a(n) ________
A) observation B) hypothesis C) conclusion D) theory