Which of the following was NOT one of
Darwin's observations?
a. Most individuals have an equal chance to
survive and reproduce.
b. Changes in populations are gradual and
take place over long periods of time.
c. Members of the same species may exhibit
considerable variation.
d. Some characteristics are heritable and
passed on to offspring.
e. Some characteristics afford their possessor
a better chance of survival.
A
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What is the correct order of these events in recombination that is resolved by the crossover pathway?
1. Double-strand break formation 2. Strand invasion 3. Resection 4. Resolution of the double Holliday junction 5. Branch migration 6. Formation of a double Holliday junction A) 6, 1, 2, 5, 3, 4 B) 1, 2, 5, 3, 6, 4 C) 6, 4, 1, 2, 5, 3 D) 1, 3, 2, 6, 5, 4 E) 1, 2, 3, 5, 6, 4
In positive feedback homeostatic mechanisms
a. the response reverses the change. b. the response intensifies the change. c. the response occurs before the change. d. none of the above answers occurs.
Which of these is not a method used by ectotherms to affect body temperature?
A. dilation or contraction of blood vessels B. shivering C. countercurrent heat exchange D. increasing metabolic rate E. basking in the sun
Salmonella, Shigella, Yersinia, and Serratia are all
A) pathogens. B) gram-negative facultatively anaerobic rods. C) gram-positive aerobic cocci. D) fermentative. E) endospore-forming bacteria.