An electron absorbs a photon of light energy and becomes energized; the electron shifts from a
__________ atomic orbital to a __________ atomic orbital.
a. higher energy; lower energy
b. fluorescing; ground state
c. ground state; another ground state
d. ground state; lower energy
e. lower energy; higher energy
E
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Most of today's animal phyla appear in the fossil record within a short span of 25 million years beginning about 530 MYA. When researchers analyzed the DNA evidence that might relate sponges to the modern phyla, what unexpected result did they find?
A. Many development genes thought to be specific to eumetazoans were found in sponges. B. The entire genome of sponges was found to be very different in gene diversity from the genomes of other phyla. C. Samples of the living sponge Oscarella carmela were found to be relatively unchanged from fossil sponge DNA samples. D. Most of the developmental genes found in eumetazoans are absent in the sponge Oscarella carmela. E. All of the answer choices are correct.
The ____ is most like an endoskeleton
a. wooden frame of a house b. covering of a chair c. hair of a dog d. trunk of a tree e. handle of a umbrella
The overall three-dimensional shape of a polypeptide is called the _____.
A. double helix B. primary structure C. secondary structure D. tertiary structure E. quaternary structure
Canada thistle is a dicot that spreads via growth from lateral roots. You want to use a root miner insect for weed control
What would you need to observe in the underground growth to verify that this weed spreads via lateral roots and not by underground stems? A) an epidermis at the periphery B) vascular bundles in a ring around the outside of a cross section C) a vascular bundle in the center surrounded by parenchyma tissue D) meristematic tissue at the tips of the branches