The figure above depicts the result of an experiment to determine how DNA replication occurs. Based on these results, it
appears that after replication, each new DNA molecule contains ____.
a. either entirely old DNA strands or entirely new DNA strands
b. one old DNA strand and one new DNA strand
c. entirely new DNA
d. some DNA helix regions from old DNA alternating with some DNA regions from new DNA
e. two strands that are each a mix of old and new DNA
ANSWER: b
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In chordates, which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?
A. Archenteron B. Neural tube C. Notochord D. Epidermis E. Intestinal tract
Which characteristic of the light absorbing regions of chlorophylls and carotenoids most likely accounts for the ability
of these molecules to absorb light?
a. ringed structures b. the presence of aldehyde side-groups c. the presence of magnesium d. an extensive network of double bonds e. long hydrocarbon chain
What is the general trend in diversity in vascular plants for the past 145 million years?
What will be an ideal response?
This term describes how cells display their genetic characteristics.
A. transcription B. gene expression C. translation D. gene phrasing