At the Beautiful Mutants Flower Shop, a variety of unique mutant plants are sold. What would be the best flower to give to a friend who is allergic to pollen?
A. "Beautiful Innocence" -- a plant with a mutation in the class C genes.
B. "Suspense" -- a plant with a mutation in the LEAFY gene.
C. "Superhunk" -- a plant with a mutation in the class A genes.
D. "Clockface" -- a plant with a mutation in the CYCLOIDEA gene.
Answer: A
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Genes that specify the final identity of a body region are called _______
A. bicoid B. homeobox genes C. homeotic D. lineage genes
According to fossil evidence, Tiktaalik either crawled or paddled in shallow, tropical streams, approximately 380 mya. These streams may have occasionally become anaerobic, but fossil structures in Tiktaalik indicate it could have what adaptation or selective advantage in these conditions?
A. It could easily crawl long distances to find new water habitats when needed. B. All of the answer choices are correct. C. It could swim better than fish with the adaptation for both gills and lungs. D. It could lift and support its head to breath air with its lungs. E. It could feed equally well on aquatic foods and terrestrial foods.
Four of the following are key characteristics for the survival of a species. Which one is the exception?
a. ability to acquire energy and nutrients b. response to environmental change c. reproduction d. inability to change e. ability to grow and adapt through changes in DNA
Which statement about a secondary immune response is FALSE?
a. It is a response to an antigen. b. It may occur years after a primary response. c. It involves memory cells. d. It has a longer latent period than a primary response. e. It is stimulated by less antigen than in a primary response.