Communication within and between cells of an embryo can include all of the following EXCEPT _____
A) increased concentration of signaling molecules
B) changes in binding to regulatory sequences
C) changes in gene transcription
D) changes in gene sequences
Answer: D
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Which of the following levels of organization are correctly arranged from smallest to largest?
a. tissue, organ, organ system b. tissue, organ system, organ c. organ system, organ, tissue d. organ system, tissue, organ e. organ, organ system, tissue
Assume that a Chi-square test was conducted to test the goodness of fit to a 9:3:3:1 ratio and a Chi-square value of 10.62 was obtained. Should the null hypothesis be accepted?
What will be an ideal response?
Actin filaments are bound into bundles of parallel filaments by the proteins
a. filamin and spectrin. b. troponin and tropomyosin. c. profilin and thymosin. d. alpha-actinin and fimbrin e. All of the above
Which of the following is CORRECT about the prokaryotes known as deeply branching bacteria?
A. They are chemoheterotrophs. B. They lack peptidoglycan walls. C. They are commonly found in acidic, anaerobic conditions. D. They grow in long branching filaments. E. They are photosynthetic.