In humans, environmental factors causing stress can impact
A. the development of all autosomal disorders.
B. the development of autosomal recessive disorders.
C. the development of autosomal dominant disorders.
D. multiple allele systems.
E. epigenetic DNA modifications.
Answer: E
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Paleobotanists often examine fossils of extinct plants and their seeds to determine the dominant biome of the area at the time when the fossil was formed. You were examining a seed that showed signs of being from grasses well-adapted to long periods without rain. The strata in which it was found showed no trees but many grasses and other plants with hard, drought-resistant seeds. Given what you know about the biomes, in which of the following would you expect to find this plant?
a. tropical wet forest b. arctic tundra c. savanna d. boreal forest
DNA has no sulfur, and proteins have no phosphorus
Indicate whether the statement is true or false
You have identified a new mammal species. You are surprised to find that it has a pelvis, but there is no evidence the
species has legs. What can you conclude about this animal’s structure? a. The animal is very young. b. The pelvis is a vestigial structure. c. The animal is a mutant species. d. The pelvic bones are present because the animal is a mammal. e. The pelvic bones are analogous to the pelvic bones found in other mammals.
Notes and observations of the venus fly-trap showed that:
A. the plant reacts to all stimuli B. The plant reacts to things that give off a strong electrical charge C. The plant is very sensitive and responds to specific stimuli D. The plant response is time sensitive E. none of the these