Which of the following best describes the ploidy level of the cells found in a fertilized embryo sac?
A) All cells are diploid.
B) All cells are triploid.
C) All cells are polyploid.
D) The ploidy level varies among species.
E) There are haploid, diploid, and triploid cells.
Answer: E
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Which of the following viruses has not been determined to be associated with a particular type of cancer?
A) mimivirus B) hepatitis B virus C) Epstein-Barr virus D) human papilloma virus E) hepatitis C virus
Which of the following statements about the
electromagnetic spectrum is true? a. Infrared energy is sufficient to produce ionization. b. Infrared radiation has more energy than red radiation. c. Visible light has more energy than ultraviolet radiation. d. Chlorophyll absorbs some visible wavelengths, but not all. e. Chloroplasts absorb all wavelengths of visible light equally.
When we use the Shannon diversity index to calculate the effective number of species, we are determining how many species would provide that same diversity value:
A. if the species were similar types of organisms. B. if the populations were equally productive. C. if the individuals were evenly distributed spatially. D. if the populations were all the same size.
What happens when cells cannot repair the damage caused by a mutagen?
a. the organism is not affected b. the organism is affected temporarily c. the DNA base sequence is not affected d. the DNA base sequence changes permanently