Why was developmental biology left out of the "modern synthesis" of evolution as it developed in the 1930s and 1940s?
A) Many developmental biologists believed that evolution progresses by rapid jumps, not slow and gradual change.
B) It was widely felt that development and genetics had to be "properly separated" for either to make any progress.
C) Many developmental biologists focused on "structuralist" explanations of evolution.
D) The genetic mechanisms of development were poorly understood at the time.
E) All of the above.
E
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Scientists have found that ancient fossils
a. are very similar to present-day organisms. b. are more similar to present-day organisms than more recent fossils. c. are just as similar to present-day organisms as more recent fossils. d. are less similar to present-day organisms than more recent fossils. e. bear no resemblance to present-day organisms.
The theory of evolution is the single most unifying concept of biology today
Indicate whether the statement is true or false
Free radicals can be damaging because they are _____.
a) unstable b) highly reactive c) radioactive d) both unstable and highly reactive
Which of the following is not a hallmark sign of primary immunodeficiencies?
A) acute B) uncommon C) severe D) recurring E) persistent