The region that determines the class of antibody is indicated by number
a. 1.
b. 2.
c. 3.
d. 4.
e. 5.
E
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Which of the following is a key feature of chordates?
a. having a notochord in the embryonic stage b. possessing many rows of tube feet c. having thin arms that lack organs d. engaging in intracellular digestion
Why is nitrogen necessary in the human body?
What will be an ideal response?
Which of the following extraembryonic membranes
forms fingerlike projections that become part of the placenta? a. amnion b. yolk sac c. chorion d. allantois e. none of these
Answer the following questions about DNA replication
A. On a DNA strand that is being synthesized, which end is growing—the 3? end, the 5? end, or both ends? Explain your answer. B. On a DNA strand that is being used as a template, where is the copying occurring relative to the replication origin—3? of the origin, 5?, or both?