A new DNA strand elongates only in the to direction because _____
A) DNA polymerase begins adding nucleotides at the end of the template
B) the polarity of the DNA molecule prevents addition of nucleotides at the end
C) replication must progress toward the replication fork
D) DNA polymerase can add nucleotides only to the free end
D
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What is thought to be a consequence of the increased oxygen (O2) in the atmosphere during and after the Silurian Period?
A. Conquest of land by arthropods. B. Conquest of land by arthropods and vertebrates. C. Increases in animal body sizes and conquest of land by plants. D. Conquest of land by arthropods and vertebrates, and plants. E. Conquest of land by arthropods and vertebrates and an increase in animal body sizes.
Sea cucumbers and sedentary annelid worms share all but which in common?
a. both can be deposit feeders. b. both have oral structures to collect detritus. c. similar body segmentation. d. digestive tract is a straight tube
The minimum age of the LUCA (last unique common ancestor) is the age of the oldest fossils that can be identified with certainty as close relatives of present-day prokaryotes and eukaryotes. Such fossils are about ________
A) 3.8 billion years old B) 2 billion years old C) 542 million years old D) 3.28 billion years old E) 65 million years old
Which of the following is not a domain of life
a. Animalia b. Eukarya c. Bacteria d. Archaea e. Plantae f. Neither Animalia nor Plantae is a domain of life g. All of these are domains of life