A homozygous plant has sepals of 30-cm flowers while another homozygote of the same species has 40-cm flowers. The F1 flowers are all 35 cm
In the F2, out of 600 plants the smallest flowers were 30 cm and the largest were 40cm; all the others were of intermediate sizes. If all the genes involved in flower size are additive, how many gene pairs are there?
4
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Respiratory surfaces in all vertebrates have all of the listed features except
A. moist epithelia. B. large surface areas. C. thick epithelia. D. a very high degree of vascularization.
Water constantly enters the cells of a freshwater sponge by osmosis. How is the sponge adapted to handle this problem? a. Contractile vacuoles expel fluid to the outside of each individual cell
b. Action of cilia in flame cells drives interstitial fluid into tubes, then out of pores at the surface. c. Extra water and wastes are transported into Malpighian tubules that route them out of the body. d. Water is excreted through tubular excretory organs called nephridia.
The specific compound that is capable of receiving light energy as the first step in sensory transduction is
A. rhodopsin. B. melanin. C. vitamin A. D. cone opsin. E. retinal.
In eukaryotes, pyruvate is converted to acetyl CoA
A) in the cellular cytosol. B) during passage through the mitochondrial outer membrane. C) in the intermembrane space. D) during passage through the inner mitochondrial membrane. E) in the mitochondrial matrix.