Which of the following piece of fossil evidence was not observed during Darwin's journey aboard the Beagle?
A. fossilized marine shells in the cliffs of the Andes Mountains
B. fossilized remains of a giant ground sloth
C. 13 different species of fossilized finches on the Galápagos Islands
D. fossilized remains of the Glyptodont
Answer: C
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How do transcription repressors work?
a. They bind to the same sequence where activators normally bind. b. They bind to and disable the activator. c. They recruit histone acetylation enzymes and thus interfere with chromatin remodeling. d. They bind to RNA polymerase II and prevent it from binding to the transcription factor complex e. They methylate DNA.
Complementary DNA strands are held together by
A. phosphodiester bonds. B. ionic bonds. C. covalent bonds. D. glycosidic bonds. E. hydrogen bonds.
Perfect flowers must have
a. reproductive structures of both sexes. b. petals. c. sepals. d. an attractive scent. e. all of these.
The letter B” in the above figure represents its
a. shell. b. mantle. c. gills. d. siphon. e. none of these.