If you were able to walk into an opening cut into the center of a large redwood tree, when you exit from the middle of the trunk (stem) outward, you would cross, in order,
a. the annual rings, new xylem, vascular cambium, phloem, and bark.
b. the secondary xylem, cork cambium, phloem, and periderm.
c. the vascular cambium, oldest xylem, and newest xylem.
d. the secondary xylem, secondary phloem, and vascular cambium.
e. the summer wood, bark, and phloem.
Ans: a. the annual rings, new xylem, vascular cambium, phloem, and bark.
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Explain the presence and function of the IgA class of antibodies.
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In the sequence of events during translation, what is the next step after an amino acid on the tRNA in the P site is linked to an amino acid on the tRNA in the A site?
A) The small ribosomal subunit attaches to the mRNA. B) The tRNA is released from the A site. C) The tRNA in the A site moves to the E site. D) The ribosome shifts down the mRNA by one codon. E) A tRNA binds to the start codon, and the large ribosomal subunit joins the ribosome.