Which of these groups is characterized by having no body cavity?
A) Cnidarians
B) Annelids
C) Arthropods
D) Chordates
E) Roundworms
A
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If you were able to look very closely at a portion of DNA and find methylated histones, you would
A. be mistaken since only DNA can be methylated, not histones. B. be looking at a region of active chromatin. C. be looking at a region of inactive chromatin. D. be looking at a chromatin remodeling complex.
The sightless eyes of animals that live in dark caves is an example of what kind of structure?
a. analogous structure b. vestigial structure c. homologous structure d. convergent structure
Which of the following is the primary assumption made by researchers when designing experiments to
model how life may have arisen?
a. The chemical reactions of living things are only possible in living systems. b. Living organisms are composed of elements commonly found in the universe and on Earth. c. Conditions on Earth have not changed over time. d. Life arose on Earth from non-living matter. e. The development of living cells from nonliving matter was very rapid.
Which of the following events is an important factor in increasing variety among sexually reproducing organisms?
A.) testcross B.) gene linkage C.) crossing over D.) mitosis