In peas, tall plants are dominant to short plants. A heterozygous plant is crossed with a homozygous recessive plant. What fraction of the offspring would you expect to have the short phenotype?
A) none
B) 1/4
C) 1/2
D) 3/4
Ans: C) 1/2
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Which of the following statements is consistent with the observation that the genetic code is nearly universal for all currently known life?
A. All organisms can reproduce with any other organism. B. All organisms have a common ancestor. C. All organisms have the same evolutionary genes. D. All organisms arose at the same time in the history of the earth.
Which of the following is the traditional source of most oils?
a. single-celled algae b. crop plants c. multicellular algae d. any plants
Which of the following proteins of the human immunodeficiency virus (HIV) is used to synthesize viral DNA?
A. RT (reverse transcriptase) B. SU (surface) C. CA (capsid) D. TM (transmembrane) E. MA (matrix)
Which alternate hypothesis might also explain industrial melanism?
A. Pollution kills important tree species that peppered moths depend on for egg laying. B. Dark moths emigrate out of polluted areas to escape the pollution. C. Dark moths are more resistant to the toxic effects of pollution than light moths. D. Birds used the marks that Kettlewell placed on the moths when he released them to help them find and capture the moths. E. Because dark moths absorb more heat, they are more active and better able to avoid bird predation.