Suppose a geneticist sequences a specific gene region in two species, A and B, previously known to be closely related. He specifically wants to see which of the two species is closer to an ancestral species
The sequence comparison showed that this region in species B has an extra intron, unlike other near relatives, but that otherwise A and B are virtually the same for this region. Based on this data alone, he could reason that which species was more likely ancestral?
A
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The genetic material (DNA) of eukaryotes is organized into
(a) centrioles. (b) spindles. (c) chromosomes. (d) microtubules.
Which combination of conditions will cause a plans stomata to open
What will be an ideal response?
A group of thylakoid discs make up what part of a chloroplast?
a. lumen b. stroma c. granum d. vacuole e. mesophyll layer
The pigment responsible for the red-yellow coloration seen in leaves during the color change in autumn is
A. carotenoid. B. chlorophyll a. C. chlorophyll b. D. phytol. E. porphyrin.