DNA replication is considered semiconservative because ____________________________
(a) after many rounds of DNA replication, the original DNA double helix is still intact.
(b) each daughter DNA molecule consists of two new strands copied from the parent DNA molecule.
(c) each daughter DNA molecule consists of one strand from the parent DNA molecule and one new strand.
(d) new DNA strands must be copied from a DNA template.
Choice (c) is the correct answer. Choices (a) and (b) are false. Although choice (d) is a correct statement, it is not the reason that DNA replication is called semiconservative.
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The pharyngeal arches contribute to the formation of the ____
a. brain and spinal cord b. heart c. legs and arms d. lungs e. larynx and pharynx
Fossil evidence of animal life dates back
__________ years. a. 125 million b. 350 million c. 570 million d. 900 million e. 1.8 billion
While looking at a flower in your garden, you notice that it has carpels with very long styles, and stamens with very short filaments. This plant is most likely to reproduce by _____
A) cross-pollination B) selfing C) asexual reproduction
The sequencing method that cuts DNA segments into fragments, arranges those fragments based on overlapping nucleotide sequences, and then clones these fragments is called
A. consensus sequencing. B. clone-by-clone sequencing. C. shotgun sequencing. D. RFLP sequencing.