These two molecules are structural isomers. What is the difference between them?
A) the number of carbon atoms
B) the number of hydrogen atoms
C) the location of a double-bonded oxygen atom
D) Only one of them has a double bond between carbon atoms.
Answer: C
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If the cell whose nuclear material is shown in the accompanying figure continues toward completion of mitosis, which of the following events would occur next?
A) cell membrane synthesis B) spindle fiber formation C) nuclear envelope breakdown D) formation of telophase nuclei E) synthesis of chromatids
Which statement is true?
a. Long-term energy storage, such as body fat reserves for hibernation, do not factor into a species’ energy budget. b. A species’ life history is determined entirely by natural selection and the inheritance of genetic material. c. All organisms must balance the energy they expend on activities with energy intake from diet or photosynthesis. d. Increased fecundity corresponds to an increased energy budget for most animals.
Which of the following is the most effective
contraceptive approach of those listed?
a. withdrawal b. diaphragm c. condoms d. douching e. rhythm method
All of the following statements concerning birds are true EXCEPT
A. birds have small, relatively under-developed brains. B. some birds do not have the ability to fly. C. birds use the sun, stars, and the Earth's magnetic field to guide them. D. birds have acute vision.