Primary productivity on land is affected by _____
a. nutrient availability c. temperature
b. amount of sunlight d. all of these
D
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Explain why lactose intolerance is considered a variation in gene expression rather than a genetic disorder
What will be an ideal response?
In which way are archaea and eukaryotes the same?
A. Contain membrane-bound organelles B. Contain mitochondria for energy production C. Have a cell wall for rigidity D. Can use flagella for movement
The insertion of a skeletal muscle is
a. attached to the less mobile portion of the skeleton. b. attached to the portion of the skeleton that moves when the muscle contracts. c. never attached to the skeleton. d. its belly.
Which example of an evolutionary adaptation decreases herbivory?
A) Plants of the milkweed family produce a toxin that Monarch butterflies can store in their bodies. B) Corn plants attacked by herbivores release an airborne chemical that turns on defensive genes in nearby corn plants. C) Caterpillars that feed on plants tend to be green. D) Damaged, partially eaten leaves can seal off the damaged area by hardening cell walls.