Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?
Select one:
a. RRYY × RRYY
b. RRYY × rryy
c. RrYy × RrYy
d. RrYy × rryy
e. rryy × rryy
c. RrYy × RrYy
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When a cone cell is stimulated by light, what will occur at the cell membrane?
Vision differs from the other senses in two interesting ways. Although most sensory receptor neurons are depolarized when the receive a stimulus, rod and cone cells become hyperpolarized when they receive light. When hyperpolarized, they stop releasing inhibitory neurotransmitter and allow the bipolar cells to fire. A second unusual aspect is that the vision circuit seems to be organized "backwards" -- the light must pass through the layers of ganglion and bipolar cells to reach the rods and cones A. excitation B. inhibition C. an action potential D. hyperpolarization E. depolarization
You find a unicellular organism that forms lobe-like pseudopodia. When you expose the cells to
cAMP, they aggregate into a slug like structure. Based on this information, you correctly conclude that this organism is: a. Entamoeba histolytica. b. Dictyostelium discoideum. c. Chaos carolinense. d. Chlamydomonas. e. Physarum polycephalum
Which of the following has the lowest OH? concentration?
A) baking soda B) pure water C) coffee D) battery acid
How many molecules of water are used to completely hydrolyze a polymer that is 11 monomers long?
A) 12 B) 11 C) 10 D) 9