Which is an example of secondary succession?
A) Beach grasses colonize a newly formed sand dune.
B) Retreating glaciers leave alluvial soils for cottonwood trees to colonize.
C) A shift in river flow introduces sediment to a rocky area.
D) A farmer allows an agricultural field to return to native grassland.
D
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The energy needed to destabilize existing chemical bonds and start a chemical reaction is called
A. activation energy B. free energy C. kinetic energy D. potential energy
During which stage of pregnancy can Treponema pallidum cross the placenta and possibly infect the fetus?
A. first trimester. B. second trimester. C. third trimester. D. any stage.
An oncologist (a physician who specializes in cancer) compares two biopsy samples by looking at the percentage of cells in mitosis. Sample 1 has 15% of cells in mitosis, and sample 2 has 8% of cells in mitosis
These samples are of the same tissue type. Which sample is likely to be cancerous, and why? Why is it important that the two samples being compared came from the same tissue type?
One difference between eukaryotic and prokaryotic cells is that eukaryotic cells ________ prokaryotic cells.
A) have DNA, which is lacking in B) have membrane-enclosed structures called organelles, which are lacking in C) have a plasma membrane, which is lacking in D) have a nucleoid region, which is lacking in