Climate diagrams are valuable because they show
A) seasonal variation in temperature and precipitation.
B) abundance of dominant vegetation.
C) diversity of plant species present.
D) variation in carbon availability.
A
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Osmoconforming sharks take in water, as needed, _____
A) by migrating to freshwater rivers to drink fresh water B) via osmosis, as their body cells are slightly hyperosmotic to seawater C) via active transport of water across the cells on their gills D) by water diffusion from seawater, which is hyperosmotic to the fluids in their cells E) by selective transport of water molecules across the wall of the gut
Which of the following is not a way nucleosome formation affects DNA?
A. compacts the DNA in the nucleus B. alters access to DNA by enzymes C. regulates the rate of DNA replication in mitochondria D. inhibits transcription by the internucleosome connections mediated by histone tails E. competes with transcription factor Sp1 to maintain transcriptional repression
Reciprocal translocations usually do not result in gain or loss of genetic information. Why can they still have devastating effects?
a. Homologs can no longer pair properly. b. Crossing over is disrupted causing meiosis to be arrested during metaphase I. c. The positions of the genes can be altered with respect to necessary regulatory sequences. d. The translocation results in an inversion.
Which of the following males in a given population would be considered the most fit in an evolutionary sense?
A) one that produced 100 offspring, of which 10 survived but 9 did not reproduce B) one that produced two offspring, both of which survived and produced offspring of their own C) one that produced 1,000 offspring, of which 100 survived but 99 did not reproduce D) one that produced 1,000 offspring, all of which died before reaching reproductive age