Some genes can bring about radical changes in body shape and organs. The Pax6 gene is one such gene and is involved in
A. eye formation in all animals.
B. breast cancer.
C. the development of limbs.
D. determining the location of repeated structures in all vertebrates.
Answer: A
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The Ames test is characterized by the use of
A) auxotrophic Salmonella typhimurium. B) heterotrophic monoploid yeast. C) autotrophic monoploid yeast. D) prototrophic Salmonella typhimurium. E) both choices A and C
Picea glauca is a seed-bearing plant. What other characteristic MUST be true of this species?
A. It produces flowers. B. It produces fruits. C. The gametophyte is the dominant generation. D. It has vascular tissue. E. Double-fertilization results in the production of endosperm.
What is the correct sequence of stages in the life cycle of the Chinese liver fluke?
A. adult, egg with miracidium, cercaria, sporocyst, rediae, metacercaria, adult. B. adult, egg with miracidium, sporocyst, rediae, metacercaria, cercaria, adult. C. adult, egg with miracidium, metacercaria, sporocyst, rediae, cercaria, adult. D. adult, sporocyst, rediae, cercaria, metacercaria, egg with miracidium, adult. E. adult, egg with miracidium, sporocyst, rediae, cercaria, metacercaria, adult.
If the codon consisted of only 2 nucleotides
there would be how many possible codons?
a. 4 b. 8 c. 16 d. 32 e. 64