Which factor is fundamentally responsible for the character of arctic tundra soils?
A) secretion of acid by lichens and plant roots
B) permafrost
C) warm, wet summers
D) abundant winter snow
Answer: B
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Which one of the following can contribute to a protein's tertiary structure?
A. ionic bonding B. van der Waal's forces C. covalent bonding D. hydrogen bonding E. All of these choices are correct.
Which major checkpoint delays the cell cycle when DNA replication is incomplete?
A. G1 checkpoint B. G2 checkpoint C. M checkpoint D. G1, G2, and the M checkpoints E. None of the checkpoints delay the cell cycle when DNA replication is incomplete.
Syntenic genes can assort independently when __________
A) they are very close together on a chromosome B) they are located on different chromosomes C) crossing over occurs rarely between the genes D) they are far apart on a chromosome and crossing over occurs frequently between the genes E) they are far apart on a chromosome and crossing over occurs very rarely between the genes
Echinoderms are characterized by bilateral symmetry in adults, a water vascular system, tube feet, and spiny skin.
a. true b. false